Unit Converter
Convert units instantly — length, weight, temperature, volume, area and speed. Free online converter: m, km, mi, ft, kg, lb, °C, °F, L, gal and more.
Updated May 2026
| Unit | Converted Value | Abbr |
|---|---|---|
| Millimeter | 1000 | mm |
| Centimeter | 100 | cm |
| Meter | 1 | m |
| Kilometer | 0.001 | km |
| Inch | 39.370079 | in |
| Foot | 3.2808399 | ft |
| Yard | 1.0936133 | yd |
| Mile | 0.00062137119 | mi |
| Nautical Mile | 0.0005399568 | nmi |
How to Convert Units
Six categories, real-time results
1. Pick a category
Length, Weight, Temperature, Volume, Area or Speed.
2. Enter the value and choose your units
Type the number into the FROM field, then select the source and target unit.
3. Copy or reverse it
The result appears instantly in the TO field — copy it or swap the conversion direction.
What This Unit Converter Does
The full category table, all at once
Length
Meters, feet, inches, miles, kilometers and more.
Weight
Milligrams, grams, kilograms, ounces, pounds and stones.
Temperature
Celsius, Fahrenheit and Kelvin, with zero points converted correctly.
Volume
Liters, US and UK gallons, cups and milliliters.
Area
Square meters, hectares, acres and square feet.
Speed
Km/h, mph, knots and meters per second.
Conversion Examples
Common conversions solved instantly
When You'll Need a Unit Converter
The most common scenarios among people who use this tool
Construction and renovation
Convert feet and inches to centimeters when working from blueprints drawn in US measurements.
Cooking and recipes
International recipes use cups, ounces and Fahrenheit — convert everything to metric without doing the math in your head.
Travel and international shipping
Speed in mph vs. km/h, luggage in pounds vs. kilograms, distances in miles vs. kilometers.
School, science and engineering
Convert SI units for lab reports, physics, chemistry or technical specifications.
Common Mistake? Start Here
Adding instead of multiplying for temperature
Celsius, Fahrenheit and Kelvin have different zero points — 0°C isn't 0°F, it's 32°F.
Mixing up US and UK gallons
The UK (imperial) gallon is about 20% larger — 4.54609 L versus 3.78541 L for the US gallon. Always confirm which standard applies before you convert.
Rounding too aggressively in technical conversions
For engineering and science, use exact conversion factors instead of rough mental approximations.
Why Use This Unit Converter
The full table shows the converted value for every unit in the category at once, so there's no need to redo the conversion one unit at a time.
It covers the six categories people convert most in everyday life — length, weight, temperature, volume, area and speed — in one place, with no sign-up and no limit on conversions.
Frequently Asked Questions
Multiply the value in meters by 3.28084. The exact conversion is 1 meter = 3.280839895 feet, since 1 foot has been defined as exactly 0.3048 meters since 1959.
References
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