TOOL 01 / FREE · NO SIGNUP
Unit Converter
Move between metric and US measurements, including fractional feet and inches.
Worked example loaded. These are example measurements and product assumptions.
THE METHOD
How to use this estimate
- Choose the type of measurement, then the source and target units.
- Enter a decimal, fraction, or supported expression. Lengths can include feet, inches and metric components.
- A US liquid gallon is 3.785411784 litres. An Imperial gallon is 4.54609 litres.
converted value = input × source factor ÷ target factor
A worked example
The “Load worked example” button uses the same inputs as this example. Explicit unit suffixes keep their meaning in either unit system.
- Measurement
- Length
- From
- Feet
- To
- Metres
- Value or measurement
- 12 ft + 7 3/8 in
Questions, answered
Can I enter fractional inches?
Yes. Use 7 3/8 in or feet and inch marks, for example 12' 7 3/8".
Does switching units erase my measurements?
Calculator input unit changes convert valid dimensional values. Converter source and target units explicitly define your conversion.
Sources and product assumptions
These references explain units or product specifications. Your selected product label takes priority; none of these sources endorses this calculator.
- NIST SI conversion factors — length, area, volume, mass and temperature ↗
- NIST US liquid gallon definition — 231 cubic inches ↗
Source check: 4 October 2026. Worked examples use stated, editable assumptions.