Step by step
- Choose a category.
- Type one value.
- Read In other units and the Conversion table.
At a glance
| Category | Units | Key factor |
|---|---|---|
| Length | mm, cm, m, km, in, ft, yd, mi | 1 in = 2.54 cm |
| Weight | mg, g, kg, t, oz, lb, st | 1 lb = 0.4536 kg |
| Volume | ml, l, m³, tsp, tbsp, fl oz, cup, pt, qt, gal | 1 gal = 3.785 L |
| Area | cm², m², ha, km², in², ft², ac, mi² | 1 ft² = 0.0929 m² |
| Speed | m/s, km/h, mph, knots | 1 mph = 1.609 km/h |
Related questions
Is temperature included?
Yes: Celsius, Fahrenheit and Kelvin.
Can I print the table?
Use the browser's Print.
Are volumes US or imperial?
US customary units.
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Updated November 14, 2026.