Length
Meters, kilometers, centimeters, millimeters, feet, inches, yards and miles.
Convert units instantly
Choose a category, type a value, and the result updates as you type.
Formula: —
All length units
| Unit | Value |
|---|
UnitCraft at a glance
- Free universal online unit converter with six categories and 33 units.
- Live conversion as you type, with a swap button and one-click copy.
- Shows the exact conversion formula, such as 1 kg = 2.20462 lb.
- 100% client-side: private, fast and no sign-up required.
A free measurement conversion tool for everyday and professional use
UnitCraft is an online unit converter that covers the six measurements people look up most: length, weight and mass, temperature, area, volume and speed. It handles metric to imperial conversion in both directions, so you can go from kilometers to miles, kilograms to pounds, or liters to US gallons without a calculator. Every calculation runs in your browser, so nothing you type is sent anywhere.
Weight and mass
Kilograms, grams, milligrams, pounds, ounces and stones.
Temperature
Celsius, Fahrenheit and Kelvin, using the exact offset formulas.
Area, volume and speed
Square meters to acres, liters to gallons and cups, and km/h to mph or knots.
How to use the unit converter
- Pick a category such as Length or Temperature.
- Type a number in the From box and choose its unit.
- Choose the unit you want in the To box. The result appears immediately.
- Use the swap button to reverse the conversion, or Copy result to paste the value elsewhere.
Common conversions
| Metric | Imperial / US |
|---|---|
| 1 kilometer | 0.621371 miles |
| 1 meter | 3.28084 feet |
| 1 centimeter | 0.393701 inches |
| 1 kilogram | 2.20462 pounds |
| 1 liter | 0.264172 US gallons |
| 1 hectare | 2.47105 acres |
| 100 km/h | 62.1371 mph |
| 0 °C | 32 °F |
Metric vs Imperial system explained
The metric system, formally the International System of Units (SI), is built on powers of ten. A kilometer is 1,000 meters and a centimeter is one hundredth of a meter, so converting inside the system only means moving a decimal point. Most countries and nearly all scientific work use it.
The imperial and US customary systems grew out of older traditional units: 12 inches in a foot, 3 feet in a yard, 1,760 yards in a mile, and 16 ounces in a pound. They are still used in the United States for everyday measurements, and partly in the United Kingdom. Modern definitions tie these units to the metric system, for example 1 inch is exactly 2.54 centimeters.
Frequently asked questions
What is UnitCraft?
UnitCraft is a free universal online unit converter for length, weight and mass, temperature, area, volume and speed. It converts as you type, shows the exact formula, and runs 100% in your browser.
Is UnitCraft secure and private?
Yes. All conversions are calculated locally in your browser with JavaScript. The values you type are never sent to a server.
How to convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 (1.8) and add 32. Formula: °F = °C × 9/5 + 32. For example, 20 °C × 1.8 + 32 = 68 °F. To go the other way, subtract 32 and multiply by 5/9.
Is this unit converter free and offline-ready?
Yes. UnitCraft is free, needs no sign-up, and all calculations run in your browser with JavaScript. Once the page has loaded, conversions do not need a server connection.
Metric vs Imperial system explained
The metric system (SI) is decimal-based, using meters, kilograms and liters. The imperial and US customary systems use feet, pounds and gallons and are mainly used in the United States and in some everyday contexts in the United Kingdom.
How many pounds are in a kilogram?
1 kilogram equals about 2.20462 pounds. To convert kg to lb, multiply by 2.20462.
How many kilometers are in a mile?
1 mile equals exactly 1.609344 kilometers. To convert miles to km, multiply by 1.609344.
Are the gallons in this converter US or UK gallons?
UnitCraft uses US customary volume units. 1 US gallon equals 3.785411784 liters, and quarts, pints and cups are based on it.
How accurate are the conversions?
Conversions use exact international definitions (for example 1 inch = 2.54 cm exactly) and results are shown with up to 10 significant digits.