Unit Converter
Convert length, weight, temperature, speed, area and digital storage. Pick a category, choose your units, and the answer updates as you type — nothing is uploaded.
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How to use the unit converter
Choose a category, type an amount, and pick the "from" and "to" units. The result appears instantly — there's no button to press and nothing leaves your device. Use the Swap units button to reverse the direction.
Length covers millimetres, centimetres, metres, kilometres, inches, feet, yards and miles. Weight / mass covers milligrams, grams, kilograms, tonnes, ounces, pounds and stone. Speed covers metres per second, kilometres per hour, miles per hour and knots. Area covers square metres, square kilometres, square feet, square miles, acres and hectares.
Temperature converts between Celsius, Fahrenheit and Kelvin. Because temperature scales have different zero points, this uses the standard formulas rather than a simple ratio.
Digital storage uses the binary, 1024-based definition: 1 KB = 1024 bytes, 1 MB = 1024 KB, 1 GB = 1024 MB, 1 TB = 1024 GB. Some storage is sold using a 1000-based definition, which is why a drive can show less usable space than the number on the box.
Everything runs in your browser — the numbers you type are never uploaded. Cooking with cups, tablespoons or teaspoons? Use the cooking measurement converter for recipe units.
Common conversions at a glance
| From | Equals |
|---|---|
| 1 mile | 1609.344 m · 1.609 km |
| 1 km | 0.621 miles |
| 1 inch | 2.54 cm |
| 1 foot | 30.48 cm · 12 inches |
| 1 kg | 2.20462 lb |
| 1 pound | 453.592 g · 16 ounces |
| 1 stone | 14 lb · 6.35 kg |
| 0°C | 32°F · 273.15 K |
| 100°C | 212°F · 373.15 K |
| 60 mph | ≈ 96.56 km/h |
| 1 knot | 1.852 km/h |
| 1 acre | ≈ 4046.86 m² · 0.405 hectare |
| 1 hectare | 10,000 m² · 2.471 acres |
| 1 GB | 1024 MB |
| 1 TB | 1024 GB |
Common unit conversion questions
How many miles are in a kilometre? One kilometre is about 0.621 miles. One mile is exactly 1609.344 metres (1.609 km). Multiply km by 0.621 for miles, or miles by 1.609 for km.
How many pounds are in a kilogram? One kilogram is about 2.20462 pounds. Multiply kg by 2.20462 for pounds, or divide pounds by 2.20462 for kg.
What is 100°C in Fahrenheit? 100°C is 212°F (water's boiling point at sea level). To convert °C to °F, multiply by 9/5 and add 32; to go back, subtract 32 then multiply by 5/9.
How fast is 60 mph in km/h? About 96.56 km/h. One mph is 1.609 km/h, so multiply mph by 1.609.
How many MB are in a GB? Here, 1 GB = 1024 MB and 1 MB = 1024 KB (the binary definition). Drives marketed with a 1000-based definition show slightly less usable space.
How tall is 5 foot 10 in centimetres? About 178 cm. Each inch is 2.54 cm, so 5 ft 10 in is 70 inches × 2.54 = 177.8 cm. To convert any height, multiply total inches by 2.54; the length category above handles feet and inches for you.
What's the difference between an acre and a hectare? Both measure land area, but a hectare is bigger: one hectare is 10,000 square metres, about 2.471 acres, while one acre is roughly 4,047 square metres. The acre is common in the US and UK; the hectare is the metric standard used in most of the world.
How do I convert mph to km/h? Multiply miles per hour by 1.609. So 60 mph is about 96.6 km/h and 30 mph is about 48.3 km/h. To go the other way, multiply km/h by 0.621 to get mph — useful when reading a speed limit sign abroad.