📐 Unit Converter
Convert length, weight, and temperature between units instantly.
Supported Units
Length: Meters, Kilometers, Centimeters, Millimeters, Miles, Yards, Feet, Inches
Weight: Kilograms, Grams, Pounds, Ounces, Stones, Metric Tons
Temperature: Celsius, Fahrenheit, Kelvin
Guide: understanding your result
- US customary units are legally defined in terms of metric units, so many conversions are exact: 1 inch = 2.54 cm and 1 pound = 0.45359237 kg.
- Temperature is not a simple multiplication: °F = °C × 9/5 + 32 and °C = (°F − 32) × 5/9.
- US and UK (imperial) gallons, pints and fluid ounces differ — a US gallon is 3.785 L, an imperial gallon 4.546 L.
Worked example
A 5 km race is 5 ÷ 1.609344 = 3.107 miles. A 180 lb person weighs 180 × 0.45359237 = 81.65 kg. 22 °C is 22 × 9/5 + 32 = 71.6 °F.
Exact and common conversion factors
| From | To | Factor |
|---|---|---|
| 1 inch | centimeters | 2.54 (exact) |
| 1 foot | meters | 0.3048 (exact) |
| 1 mile | kilometers | 1.609344 (exact) |
| 1 pound | kilograms | 0.45359237 (exact) |
| 1 ounce (avoirdupois) | grams | 28.349523125 |
| 1 US gallon | liters | 3.785411784 |
| 1 US fluid ounce | milliliters | 29.5735 |
| 1 acre | square meters | 4,046.86 |
Source: NIST Handbook 44, Appendix C.
Common mistakes to avoid
- Using imperial gallons for US recipes or fuel figures.
- Rounding intermediate results in multi-step conversions instead of rounding only the final answer.
- Confusing fluid ounces (volume) with ounces (weight).
Frequently asked questions
Is a ton the same everywhere?
No. A US short ton is 2,000 lb (907.2 kg), a UK long ton 2,240 lb (1,016 kg) and a metric tonne 1,000 kg.
Why do my kitchen conversions differ from the label?
Cup sizes vary (US customary cup 236.6 mL, US legal cup used on nutrition labels 240 mL, metric cup 250 mL).
Official sources
Examples are calculated live from the same data the calculator uses and are for education only — they are not financial, tax or investment advice.
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