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Unit Converter

Convert between length, weight, temperature, volume, speed, area, and energy units

Common Conversions

About Unit Converter

Converting between metric and imperial - or between any two units - usually means reaching for a calculator or a search. Type the value and pick your units; the result appears instantly. Supports 40+ unit types across 7 categories.

What it does

  • Convert across 7 categories: length, weight, temperature, volume, speed, area and energy.
  • Support for 40+ unit types including metric, imperial and specialized units.
  • Instant results as you type - no button required.
  • Quick-conversion tiles for the most common conversions.

How it works

  1. 1 Select a category (length, weight, temperature, etc.).
  2. 2 Pick the units you want to convert from and to.
  3. 3 Enter a value and see the result instantly.

Common conversions at a glance

Distance: 1 km = 0.621 miles. Weight: 1 kg = 2.205 pounds. Temperature: 0°C = 32°F. Volume: 1 liter = 0.264 gallons. Speed: 100 km/h = 62.1 mph. Tap any quick tile above to populate the fields.

Accuracy and precision

Results are computed to full floating-point precision then displayed to 6 significant figures. For very large or very small numbers, scientific notation is used. The level of precision shown is appropriate for typical use - recipes, distance estimates, temperature checks, building measurements.

Questions

What units are supported?

Length: mm, cm, m, km, inch, foot, yard, mile, nautical mile. Weight: mg, g, kg, ton, oz, lb, stone. Temperature: °C, °F, K. Volume: ml, L, tsp, tbsp, cup, pint, quart, gallon. Speed: m/s, km/h, mph, knot, ft/s. Area: mm², cm², m², km², in², ft², yd², mi², hectare, acre. Energy: joules, calories, watt-hours and more.

Can I swap the units?

Yes. Click the ⇄ button between the unit selectors to swap them instantly.

Why is the result different than another converter?

Rounding and display precision vary between tools. This one computes at full precision and shows 6 significant figures - more than enough for recipes, distances, temperatures and building measurements.