Unit Converter: Convert Length, Weight, Temperature & More
Convert between metric, US customary, and UK imperial units in seconds. Switch across length, weight, temperature, volume, area, speed, time, and digital storage, see the exact formula, and compare all units at once.
All Length units
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How to Use the Unit Converter
Choose a category
Pick Length, Weight, Temperature, Volume, Area, Speed, Time, or Data at the top of the tool.
Type your number
Enter any amount in the box and choose your starting unit and target unit from the menus.
Swap, copy, or compare
Flip the units in one click, copy the result, or check the table below to see every unit at once.
Everything You Need in One Converter
Eight everyday categories
Covers length, weight, temperature, kitchen and liquid volume, land area, speed, time, and data.
Exact conversion formulas
Shows the math behind every conversion so you can double-check homework, recipes, or specs.
All units at a glance
The live table below converts your number into every unit in the category at the same time.
US & UK volume support
Includes both US customary cups, pints, and gallons and UK imperial pints and gallons.
One-click swap & copy
Reverse the direction of any conversion or copy the clean number to your clipboard right away.
Fast and private
All calculations happen in your browser with zero delay. Nothing is uploaded or tracked.
How Metric and Imperial Units Compare
Most of the world uses the metric system (also called the International System of Units, or SI), which is built on powers of 10: 10 millimeters make a centimeter, 100 centimeters make a meter, and 1,000 meters make a kilometer. The United States primarily uses US customary units (inches, feet, yards, miles, ounces, pounds, and Fahrenheit), while the United Kingdom and Canada use a mix of metric and imperial units in daily life. Since 1959, imperial and US length and weight units have been officially defined using exact metric standards—for example, 1 inch is fixed at exactly 25.4 millimeters.
Most Common Unit Conversion Formulas
- Centimeters to Inches: inches = cm ÷ 2.54 (1 in = 2.54 cm)
- Meters to Feet: feet = meters × 3.28084 (1 ft = 0.3048 m)
- Kilometers to Miles: miles = km ÷ 1.609344 (1 mi = 1.609344 km)
- Kilograms to Pounds: pounds = kg × 2.204623 (1 lb = 0.45359237 kg)
- Grams to Ounces: ounces = grams ÷ 28.34952 (1 oz = 28.349523125 g)
- Celsius to Fahrenheit: °F = (°C × 9 ÷ 5) + 32
- Fahrenheit to Celsius: °C = (°F − 32) × 5 ÷ 9
US Customary vs. UK Imperial Volume Units
One of the most common mistakes in recipes and fuel calculations comes from mixing up US and UK volume units. Even though they share the same names—gallon, quart, pint, and fluid ounce—their sizes are different:
- Gallon: 1 US gallon is 3.785 liters (128 US fl oz), while 1 UK imperial gallon is 4.546 liters (160 imp fl oz).
- Pint: 1 US liquid pint is 473.18 ml (16 US fl oz), while 1 UK imperial pint is 568.26 ml (20 imp fl oz).
- Cup: A standard US customary cup is 236.59 ml (8 US fl oz), whereas metric recipes in Australia, New Zealand, Canada, and the UK often use a 250 ml cup.
How Accurate Are These Conversions?
Every conversion factor in this tool is based on exact international standards published by the National Institute of Standards and Technology (NIST) and the International Bureau of Weights and Measures (BIPM). Results are rounded cleanly for readability—up to 6 decimal places for normal numbers, or scientific notation for extremely large or small numbers—so you get practical answers without trailing zeros.
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Frequently Asked Questions
Is this unit converter free?
Yes. The BixTools unit converter is completely free to use, with no signup and no limits.
How do I convert centimeters to inches?
Divide the number of centimeters by 2.54. One inch is defined as exactly 2.54 centimeters, so 10 cm equals about 3.937 inches.
How do I convert kilograms to pounds?
Multiply the weight in kilograms by 2.20462262. One pound is exactly 0.45359237 kilograms, so 10 kg equals about 22.046 pounds.
What is the formula for Celsius to Fahrenheit?
Multiply the Celsius temperature by 9/5 (or 1.8) and add 32. To convert Fahrenheit back to Celsius, subtract 32 and multiply by 5/9.
What is the difference between a US gallon and a UK imperial gallon?
A US liquid gallon is 3.78541 liters (128 US fluid ounces), while a UK imperial gallon is 4.54609 liters (160 imperial fluid ounces). An imperial gallon is about 20% larger than a US gallon.
How many meters are in a mile?
One international mile is exactly 1,609.344 meters, or about 1.609 kilometers.
How many square feet are in an acre?
One acre equals exactly 43,560 square feet, or about 4,046.86 square meters (0.4047 hectares).
Does this converter support negative numbers?
Yes. Negative values work in the Temperature converter—for example, -40 Celsius equals -40 Fahrenheit. Physical measurements like length, weight, and area require zero or positive numbers.
Why are there 1,000 MB in a GB here instead of 1,024?
This tool uses the standard decimal (SI) system where 1 gigabyte (GB) equals 1,000 megabytes (MB), which matches how storage drive makers, macOS, and network speeds measure data.
Are the numbers I enter saved or uploaded?
No. Every conversion runs inside your browser. Nothing you type is ever sent to a server or stored.