Unit Converter

Convert between metric, imperial, and other units of measurement instantly. Supports length, weight, temperature, volume, area, speed, data, time, energy, and pressure conversions with precise results.

From

Decimal places

Note: This converter uses standard conversion factors defined by NIST and the International System of Units (SI). Temperature conversions use offset-based formulas rather than simple multiplication factors.

What Is Unit Conversion?

Unit conversion is the process of changing a measurement from one unit to another within the same quantity type while preserving the actual value being measured. For example, converting 1 kilometer to 1,000 meters does not change the physical distance — it simply expresses it using a different unit. Unit conversion is fundamental to science, engineering, medicine, cooking, international trade, and everyday life. The need for conversion arises because different countries, industries, and historical traditions use different measurement systems. The most widely used systems are the International System of Units (SI), commonly known as the metric system, and the imperial (or US customary) system used primarily in the United States. The ability to convert between units accurately ensures clear communication, prevents costly errors, and enables collaboration across borders and disciplines. Our unit conversion calculator supports ten major categories — length, weight, temperature, volume, area, speed, digital storage, time, energy, and pressure — covering the most commonly needed conversions in daily life and professional work.

How to Convert Units of Measurement

Unit conversion relies on a simple mathematical principle called dimensional analysis. You multiply the original value by a conversion factor — a ratio that equals one — to cancel the original unit and introduce the desired unit.

General Conversion Formula

Result = Value × Conversion Factor

Example: Converting Miles to Kilometers

5 miles × 1.60934 (km/mile) = 8.0467 km

Special Case: Temperature Conversion

Temperature conversions are unique because they involve an offset (not just multiplication). The key formulas are:

°F = °C × 9/5 + 32°C = (°F − 32) × 5/9K = °C + 273.15

All conversion factors in this calculator are based on definitions from NIST (National Institute of Standards and Technology) and the International System of Units (SI).

Unit Conversion Categories

The table below shows the ten categories of unit conversions supported by our calculator, along with the key units available in each category.

Category	Common Use Cases
Length	Length measures the distance between two points. The SI base unit is the meter (m). Common conversions include kilometers to miles (1 km = 0.6214 mi), centimeters to inches (1 in = 2.54 cm), and feet to meters (1 ft = 0.3048 m). Length conversions are among the most frequently needed in daily life, from measuring room dimensions to understanding road distances in different countries.
Weight / Mass	Weight and mass measure the amount of matter in an object. The SI base unit is the kilogram (kg). Key conversions include pounds to kilograms (1 lb = 0.4536 kg), ounces to grams (1 oz = 28.3495 g), and stones to kilograms (1 st = 6.3503 kg). Weight conversions are essential for cooking, health tracking, shipping, and international trade.
Temperature	Temperature measures the degree of heat in a substance. Three main scales exist: Celsius (°C), Fahrenheit (°F), and Kelvin (K). Unlike other conversions, temperature requires offset formulas: °F = °C × 9/5 + 32 and K = °C + 273.15. Celsius is used worldwide for everyday purposes, Fahrenheit mainly in the US, and Kelvin in scientific contexts.
Volume	Volume measures the three-dimensional space occupied by a substance. The SI unit is the cubic meter (m³), but liters (L) are more common in daily use. Important conversions include liters to US gallons (1 gal = 3.7854 L), milliliters to fluid ounces (1 fl oz = 29.5735 mL), and cups to milliliters (1 cup = 236.588 mL). Volume conversions are critical for cooking, chemistry, and fuel measurements.
Area	Area measures the size of a two-dimensional surface. The SI unit is the square meter (m²). Common conversions include square feet to square meters (1 ft² = 0.0929 m²), acres to hectares (1 ac = 0.4047 ha), and square kilometers to square miles (1 km² = 0.3861 mi²). Area conversions are vital for real estate, agriculture, urban planning, and land management.
Speed	Speed measures the rate of movement over distance per unit of time. The SI unit is meters per second (m/s), but kilometers per hour (km/h) and miles per hour (mph) are more common in daily life. Key conversions include km/h to mph (1 km/h = 0.6214 mph) and knots to km/h (1 kn = 1.852 km/h). Speed conversions are essential for travel, aviation, and maritime navigation.
Digital Storage	Digital storage measures the capacity to store information electronically. The base unit is the byte (B). Standard decimal prefixes are used: 1 KB = 1,000 B, 1 MB = 1,000 KB, 1 GB = 1,000 MB, 1 TB = 1,000 GB, and 1 PB = 1,000 TB. Note that binary prefixes (KiB, MiB, GiB) use powers of 1,024 instead. Data conversions are essential for computing, storage planning, and understanding internet bandwidth.
Time	Time measures the duration of events. The SI base unit is the second (s). Standard conversions include 60 seconds = 1 minute, 60 minutes = 1 hour, 24 hours = 1 day, and 7 days = 1 week. Months and years use average values (1 month ≈ 30.44 days, 1 year ≈ 365.25 days) to account for varying lengths. Time conversions are useful for project planning, scheduling, and scientific calculations.
Energy	Energy measures the capacity to do work. The SI unit is the joule (J). Common conversions include kilocalories to kilojoules (1 kcal = 4.184 kJ), watt-hours to joules (1 Wh = 3,600 J), and BTU to kilojoules (1 BTU = 1.0551 kJ). Energy conversions bridge nutrition (calories), electricity (kilowatt-hours), and heating/cooling (BTU) contexts.
Pressure	Pressure measures force applied per unit area. The SI unit is the pascal (Pa). Key conversions include atmospheres to kilopascals (1 atm = 101.325 kPa), PSI to kilopascals (1 psi = 6.8948 kPa), bars to atmospheres (1 bar = 0.9869 atm), and mmHg to kilopascals (1 mmHg = 0.1333 kPa). Pressure conversions are used in weather forecasting, tire maintenance, medical blood pressure readings, and industrial applications.

Limitations of Unit Converters

While unit converters are highly reliable tools for standard conversions, there are several important limitations and considerations you should be aware of:

Floating-Point Precision

Computers represent decimal numbers in binary format, which can introduce tiny rounding errors — typically at the 15th significant digit or beyond. For extremely large values (trillions) or extremely small values (nano-scale), these rounding artifacts may become noticeable. For virtually all everyday and professional applications, the precision is more than sufficient, but metrological or aerospace applications may require specialized high-precision libraries.

Temperature Offset Formulas

Temperature conversions are fundamentally different from other unit conversions because they involve additive offsets, not just multiplicative factors. Converting Celsius to Fahrenheit requires multiplying by 9/5 and then adding 32. This means you cannot simply apply a ratio — the conversion logic is unique. Our converter handles this correctly, but it is important to understand why temperature behaves differently from units like length or weight.

Context-Dependent Units

Some unit names refer to different quantities depending on context. A fluid ounce measures volume, while an ounce (avoirdupois) measures weight. A US gallon (3.785 L) differs from an Imperial gallon (4.546 L). A 'ton' can mean a metric ton (1,000 kg), a short ton (2,000 lbs), or a long ton (2,240 lbs). Users must ensure they select the correct unit for their intended measurement.

Real-Time or Dynamic Units

This converter handles fixed, well-defined conversion factors. Units that fluctuate in real time — such as currency exchange rates, commodity prices per unit weight, or purchasing power comparisons — are not supported because they require live data feeds and change constantly.

Regional and Traditional Units

Traditional measurement units (such as Korean pyeong for area, Chinese jin for weight, or Japanese tsubo for area) may have slight regional variations in their exact definitions. While our converter uses the most widely accepted standard definitions, some traditional units lack a universally agreed-upon precise value.

Tips for Accurate Conversions

To get the most reliable results from any unit converter, keep these best practices in mind:

•Verify critical conversions — For high-stakes applications (medical dosing, engineering tolerances, legal measurements), always double-check conversions against an authoritative source such as NIST.
•Understand the context — Make sure you are converting the correct type of unit. Weight ounces and fluid ounces, US gallons and Imperial gallons, and short tons and metric tons are common sources of confusion.
•Consider significant figures — Match the precision of your result to the precision of your input. Converting '5 miles' to '8.04672 kilometers' implies more precision than the original measurement warrants; '8.0 km' is more appropriate.

Unit Systems Around the World

Understanding the world's major measurement systems helps explain why unit conversion is so frequently needed. Different countries, industries, and scientific fields have adopted different standards, and navigating between them is a daily reality for billions of people.

The Metric System (SI)

The International System of Units (SI), commonly known as the metric system, is the world's most widely adopted measurement system. It is used by every country on Earth for scientific purposes and by all but three countries (the United States, Liberia, and Myanmar) as the primary system for everyday measurements. The metric system is built on seven base units: the meter (length), kilogram (mass), second (time), ampere (electric current), kelvin (temperature), mole (amount of substance), and candela (luminous intensity).

The metric system's greatest strength is its decimal structure — each unit scales by powers of ten using standard prefixes (milli-, centi-, kilo-, mega-, etc.). This makes mental math and conversion within the system straightforward: 1 kilometer = 1,000 meters = 100,000 centimeters. The system was first adopted during the French Revolution in the 1790s and has been refined into the modern SI by international agreement.

The Imperial and US Customary Systems

The imperial system originated in the British Empire and evolved over centuries from various local measurement traditions. The US customary system is closely related but diverges in some key measurements, particularly for volume. A US gallon (3.785 liters) is smaller than an Imperial gallon (4.546 liters), and the US fluid ounce, pint, quart, and cup also differ from their Imperial counterparts.

The imperial/US customary system uses units like inches, feet, yards, and miles for length; ounces, pounds, and tons for weight; and Fahrenheit for temperature. While often criticized for its lack of a consistent base (12 inches = 1 foot, 3 feet = 1 yard, 5,280 feet = 1 mile), the system remains deeply embedded in American culture, construction, aviation, and several other industries worldwide.

Traditional and Regional Units

Many countries retain traditional units for specific purposes alongside the metric system. In South Korea, the pyeong (approximately 3.3058 m²) is still commonly used in real estate despite official metrication. In Japan, the tsubo (approximately 3.306 m²) serves a similar role. In China, the jin (500 grams) remains common in food markets. In the UK, pints are used for beer and miles for road distances, even though the country officially uses the metric system for most purposes.

These traditional units persist because they carry cultural significance, are deeply embedded in industry practices, or simply feel more intuitive to local populations for specific use cases. A reliable unit converter should acknowledge these regional variations and provide accurate conversions for the most commonly used traditional units alongside standard metric and imperial conversions.

Why You Should Know How to Convert Units

Unit conversion is an essential life skill that goes far beyond academic exercises. In an increasingly globalized world, you encounter different measurement systems daily — whether you are reading a recipe that uses cups and ounces while your kitchen scale shows grams, checking the weather forecast in Celsius while thinking in Fahrenheit, or comparing product specifications listed in different unit systems. Errors in unit conversion can have serious consequences, from minor cooking mishaps to catastrophic engineering failures.

One of the most famous unit conversion failures occurred in 1999 when NASA lost the $125 million Mars Climate Orbiter because one engineering team used imperial units (pound-force seconds) while another used metric units (newton-seconds). This costly mistake underscores why understanding and accurately performing unit conversions matters in professional settings. Similarly, in healthcare, medication dosage errors due to unit confusion between milligrams and micrograms have led to serious patient harm.

For everyday purposes, knowing how to convert units helps you shop smarter when comparing prices across different package sizes, understand nutritional information on food labels from different countries, follow international recipes accurately, plan travel in countries that use different measurement systems, and communicate measurements clearly with people around the world.

Who Should Use a Unit Converter

A unit converter is invaluable for students and educators working with physics, chemistry, engineering, and mathematics problems. These disciplines constantly require converting between different units and systems, and a reliable converter eliminates manual calculation errors while reinforcing understanding of dimensional analysis concepts.

Professionals across many fields rely on unit conversion daily. Engineers and architects convert between metric and imperial measurements for international projects. Healthcare workers convert between dosage units. Chefs and food scientists convert recipe measurements for different markets. Logistics professionals convert weights and dimensions for international shipping. Real estate agents convert between square meters, square feet, and acres depending on their market.

Travelers and expatriates frequently need to convert temperature, distance, weight, and volume units when navigating daily life in a country that uses a different measurement system. Whether you are filling up your car with fuel measured in liters instead of gallons, reading speed limit signs in kilometers per hour instead of miles per hour, or understanding your body weight in kilograms instead of pounds, a quick and accurate unit converter makes the transition seamless.

Unit Converter vs. Other Conversion Methods

Several methods exist for converting between units of measurement. Here is how an online unit converter compares to other approaches you might use.

Method	How It Works	Advantages	Limitations
Online Unit Converter	Enter a value, select source and target units, and get instant results	Instant, accurate, covers hundreds of unit pairs; no math skills required; accessible on any device	Requires internet access; users must select correct unit type (e.g., US vs. Imperial gallon)
Manual Calculation	Multiply by memorized or looked-up conversion factors using pen, paper, or mental math	Builds understanding of relationships between units; works without technology; useful in exams	Slow and error-prone for complex conversions; requires memorizing many factors; easy to misplace a decimal
Search Engine Query	Type a query like '5 miles in km' into Google or Bing	Quick for one-off conversions; no app needed; natural language input	Limited to one conversion at a time; no category browsing; cannot compare multiple units simultaneously
Dedicated Conversion App	Download a specialized unit conversion app on your smartphone	Works offline; often includes niche units; may include favorites and history features	Requires installation; storage space on device; may contain ads or require payment
Printed Conversion Chart	Reference a table of common conversion factors on paper or poster	No technology needed; good for quick visual reference in workshops or kitchens	Limited to pre-printed conversions; cannot handle arbitrary values; can become outdated

Online Unit Converter

How It Works: Enter a value, select source and target units, and get instant results
Advantages: Instant, accurate, covers hundreds of unit pairs; no math skills required; accessible on any device
Limitations: Requires internet access; users must select correct unit type (e.g., US vs. Imperial gallon)

Manual Calculation

How It Works: Multiply by memorized or looked-up conversion factors using pen, paper, or mental math
Advantages: Builds understanding of relationships between units; works without technology; useful in exams
Limitations: Slow and error-prone for complex conversions; requires memorizing many factors; easy to misplace a decimal

Search Engine Query

How It Works: Type a query like '5 miles in km' into Google or Bing
Advantages: Quick for one-off conversions; no app needed; natural language input
Limitations: Limited to one conversion at a time; no category browsing; cannot compare multiple units simultaneously

Dedicated Conversion App

How It Works: Download a specialized unit conversion app on your smartphone
Advantages: Works offline; often includes niche units; may include favorites and history features
Limitations: Requires installation; storage space on device; may contain ads or require payment

Printed Conversion Chart

How It Works: Reference a table of common conversion factors on paper or poster
Advantages: No technology needed; good for quick visual reference in workshops or kitchens
Limitations: Limited to pre-printed conversions; cannot handle arbitrary values; can become outdated

How to Master Unit Conversions

Whether you are a student, professional, or simply someone who encounters different measurement systems regularly, developing fluency in unit conversion will save you time and prevent errors. Here are practical strategies for building your conversion skills.

Learn the Key Conversion Factors

You do not need to memorize hundreds of conversion factors. Start with the most common ones that you encounter frequently: 1 inch = 2.54 cm, 1 mile = 1.609 km, 1 pound = 0.4536 kg, 1 gallon = 3.785 liters, and °F = °C × 9/5 + 32. These five conversions cover the majority of everyday conversion needs between metric and imperial systems.

For quick mental estimates, use rounded approximations: 1 km ≈ 0.6 miles, 1 kg ≈ 2.2 lbs, 1 liter ≈ 0.26 gallons, and 30 °C ≈ 86 °F. These rough values are accurate enough for casual conversations, travel, and quick sanity checks before relying on a precise converter.

Master Dimensional Analysis

Dimensional analysis is the systematic method scientists and engineers use to convert units. The core idea is simple: multiply your value by a fraction (conversion factor) where the numerator and denominator are equal but expressed in different units. The original unit cancels out, leaving you with the desired unit. For example: 10 feet × (0.3048 m / 1 ft) = 3.048 m.

This technique becomes especially powerful for multi-step conversions. To convert miles per hour to meters per second: 60 mph × (1.609 km / 1 mi) × (1,000 m / 1 km) × (1 hr / 3,600 s) = 26.82 m/s. Each conversion factor equals one, so you are simply multiplying by one repeatedly while changing units at each step.

Avoid Common Conversion Mistakes

The most frequent mistake is confusing similar-sounding units. Fluid ounces (volume) and ounces (weight) are completely different measurements. US gallons and Imperial gallons differ by about 20%. Metric tons (1,000 kg), short tons (907.2 kg), and long tons (1,016 kg) are three distinct units all called 'tons.' Always verify which specific unit your conversion requires.

Another common error involves squared and cubed units. When converting area units, you must square the linear conversion factor: since 1 foot = 0.3048 meters, 1 square foot = 0.3048² = 0.0929 square meters (not 0.3048 square meters). Similarly, for volume: 1 cubic foot = 0.3048³ = 0.02832 cubic meters. Forgetting to apply the exponent is a frequent source of significant errors.

Important Reminder

While this unit converter provides highly accurate conversions for everyday and professional use, always verify critical conversions independently for applications where errors could have serious consequences — such as medical dosing, structural engineering, aerospace calculations, or legal measurements. Use authoritative sources like NIST (nist.gov) for official conversion factors.

Additional Information and Precision Notes

The conversion factors used in this calculator are based on exact definitions where they exist (for example, 1 inch is defined as exactly 25.4 millimeters) and the most precise accepted values for derived conversions. Most results are accurate to at least 10 significant figures, which exceeds the precision needed for virtually all practical applications.

Important considerations when converting units:

Floating-point arithmetic in computers can introduce tiny rounding errors (typically at the 15th decimal place or beyond) for extremely large or small values. For most practical purposes, these are negligible.
Some units like 'month' and 'year' in time conversions use average values (1 month = 30.4375 days, 1 year = 365.25 days) because actual months and years vary in length.
This converter uses US customary units for volume measurements (US gallon, US fluid ounce, etc.), which differ from Imperial (UK) units of the same name. A US gallon equals approximately 3.785 liters, while an Imperial gallon equals approximately 4.546 liters.

For scientific and engineering applications requiring the highest precision, always verify critical conversions against the latest NIST reference data. While our converter handles the vast majority of everyday and professional conversion needs accurately, specialized domains like metrology, aerospace, and pharmaceutical manufacturing may require additional precision controls and uncertainty analysis beyond what any general-purpose converter provides.

Frequently Asked Questions About Unit Conversion

Unit conversion is the process of expressing a measurement in a different unit while preserving the same quantity. It is needed because the world uses multiple measurement systems — primarily the metric (SI) system and the imperial/US customary system. Scientists, engineers, healthcare workers, cooks, travelers, and everyday consumers regularly encounter measurements in units different from those they are accustomed to. Without accurate unit conversion, miscommunication, errors in calculations, and even dangerous mistakes can occur. For example, NASA's $125 million Mars Climate Orbiter was lost in 1999 due to a unit conversion error between metric and imperial measurements.

To convert Celsius to Fahrenheit, multiply the Celsius temperature by 9/5 (or 1.8) and then add 32. The formula is: °F = °C × 9/5 + 32. For example, 25 °C = 25 × 1.8 + 32 = 77 °F. To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit temperature and then multiply by 5/9. The formula is: °C = (°F − 32) × 5/9. For example, 98.6 °F = (98.6 − 32) × 5/9 = 37 °C. A helpful reference point is that 0 °C = 32 °F (the freezing point of water) and 100 °C = 212 °F (the boiling point of water). For quick mental estimates, you can use the approximation: double the Celsius value and add 30 to get a rough Fahrenheit equivalent.

The metric system (SI) is a decimal-based measurement system where units scale by powers of ten — 1 kilometer = 1,000 meters, 1 kilogram = 1,000 grams. It uses meters for length, kilograms for mass, liters for volume, and Celsius for temperature. The imperial system (and the closely related US customary system) uses non-decimal relationships — 12 inches = 1 foot, 3 feet = 1 yard, 5,280 feet = 1 mile. It uses feet and inches for length, pounds and ounces for weight, gallons and fluid ounces for volume, and Fahrenheit for temperature. The metric system is used by virtually every country for scientific and official purposes, while the imperial/US customary system is the primary everyday system only in the United States, Liberia, and Myanmar.

One mile equals exactly 1.609344 kilometers. Conversely, one kilometer equals approximately 0.621371 miles. This conversion factor was established when the international mile was defined as exactly 1,609.344 meters by international agreement in 1959. For quick mental math, you can use the approximation that 1 mile ≈ 1.6 km, or multiply miles by 8 and divide by 5. Another useful trick is the Fibonacci sequence relationship: consecutive Fibonacci numbers approximate the mile-to-kilometer conversion. For example, 5 miles ≈ 8 km, 8 miles ≈ 13 km, and 13 miles ≈ 21 km.

To convert pounds to kilograms, multiply the number of pounds by 0.45359237. For example, 150 pounds = 150 × 0.4536 = 68.04 kilograms. To convert kilograms to pounds, multiply by 2.20462. For quick mental math, you can divide pounds by 2.2 to approximate kilograms, or double the kilogram value and add 10% for a rough pounds estimate. For example, 80 kg × 2.2 = 176 lbs. The pound (avoirdupois) is defined as exactly 0.45359237 kilograms by international agreement. Note that there are different types of pounds — the troy pound (used for precious metals) equals 0.3732 kg — so always ensure you are using the correct type.

One US gallon equals exactly 3.785411784 liters. One Imperial (UK) gallon equals approximately 4.54609 liters. The US and Imperial gallons differ because they evolved from different historical definitions. The US gallon is based on the English wine gallon of 231 cubic inches, while the Imperial gallon is defined as the volume of 10 pounds of water at 62 °F. This approximately 20% difference is a common source of confusion. For quick estimates, remember that 1 US gallon ≈ 3.8 liters (or roughly 4 liters). When reading recipes, fuel economy figures, or product labels, always check whether US or Imperial gallons are being referenced.

Dimensional analysis is a mathematical technique for converting between units by multiplying a measurement by one or more conversion factors expressed as fractions. Each conversion factor is a fraction equal to one, where the numerator and denominator represent the same quantity in different units. For example, since 1 km = 1,000 m, the fraction 1,000 m / 1 km equals one. To convert 5 km to meters: 5 km × (1,000 m / 1 km) = 5,000 m. The 'km' units cancel out, leaving meters. This method is especially powerful for multi-step conversions. To convert 30 miles per hour to meters per second: 30 mi/hr × (1,609.34 m / 1 mi) × (1 hr / 3,600 s) = 13.41 m/s. Dimensional analysis ensures units are handled correctly and is the standard method taught in science and engineering education.

To convert square meters to square feet, multiply by 10.7639. For example, 100 square meters = 100 × 10.7639 = 1,076.39 square feet. To convert square feet to square meters, multiply by 0.0929 (or divide by 10.7639). This conversion factor comes from squaring the linear conversion: since 1 meter = 3.28084 feet, 1 square meter = 3.28084² = 10.7639 square feet. This is important in real estate — a 50 m² apartment is approximately 538 square feet. For quick mental estimates, multiply square meters by 10 and add about 8% for a rough square footage figure. When comparing property sizes internationally, always verify whether the listed area includes balconies, common areas, or wall thickness, as these conventions vary by country.

KB (kilobyte) and KiB (kibibyte) represent two different standards for measuring digital storage. A kilobyte (KB) uses the decimal (SI) definition: 1 KB = 1,000 bytes. A kibibyte (KiB) uses the binary definition: 1 KiB = 1,024 bytes (2¹⁰). This distinction exists because computers operate in binary (powers of 2), while the SI system uses decimal (powers of 10). The IEC introduced binary prefixes (kibi, mebi, gibi, tebi) in 1998 to eliminate confusion, but adoption has been inconsistent. Storage manufacturers typically use decimal definitions (making drives appear larger), while operating systems often use binary definitions (showing less space than the label). The discrepancy grows with larger units: 1 TB (decimal) = 1,000 GB, but 1 TiB (binary) = 1,024 GiB ≈ 1,099.5 GB — about a 10% difference.

The United States uses the US customary system (closely related to but not identical to the British imperial system) largely due to historical, economic, and cultural factors. The US considered adopting the metric system multiple times — the Metric Conversion Act of 1975 declared the metric system the 'preferred system of weights and measures for US trade and commerce,' but made adoption voluntary rather than mandatory. The estimated cost of converting infrastructure, signage, tools, manufacturing equipment, and re-training the workforce was deemed prohibitive by many industries. Cultural familiarity also plays a significant role: Americans intuitively understand miles, pounds, and Fahrenheit in ways that would take a generation to shift. Interestingly, the US does use metric units extensively in science, medicine, the military, and international trade. All US customary units are officially defined in terms of metric standards — the inch is defined as exactly 25.4 millimeters, and the pound as exactly 0.45359237 kilograms.