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Unit converter

Exact factors

Convert between US imperial and metric units: length, weight, volume, area, speed, temperature, data size, pressure and energy. Type the value and the two units.

Try:
e.g. mi, km, ft, in, cm, lb, kg, oz, g, F, C, gal, L, mph, kph, acre, sqft, MB, GiB

Fill in the fields to see the result.

How to use it

  1. Enter the value.
  2. Type the from and to units, e.g. mi and km, lb and kg, F and C, gal and L.
  3. Read the result; your last units are remembered.

Details

Units
mi, yd, ft, in, km, m, cm, mm, lb, oz, kg, g, gal, qt, cup, fl oz, L, mL, mph, kph, acre, sqft, F, C, K, KB/MB/GB, KiB/MiB/GiB and more
Precision
Exact definitions (1 in = 2.54 cm, 1 lb = 0.45359237 kg), shown to 12 significant digits
US volume
US gallons and fluid ounces

Questions

Are gallons US or imperial?

US gallons (3.785411784 L). UK imperial gallons are larger (4.54609 L).

How do I convert feet and inches?

Convert inches: 5 ft 10 in is 70 in, which is 177.8 cm. The BMI calculator accepts 5'10" directly.

Why do I get an error?

The two units must measure the same thing (you can't turn kilograms into liters), and the unit name must be one the converter knows; the message lists suggestions.

Is what I type sent anywhere?

No. The calculation runs in this browser tab with the same code our MCP server uses. Nothing you type is sent to a server or saved, apart from settings like filing status, which stay in this browser.

Can an AI agent use this?

Yes. The same function is a tool on our free MCP server at tools.cuelark.com/mcp, so ChatGPT, Claude or Cursor get exactly the answer this page shows. 'Copy MCP call' gives you the arguments.