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Length Calculator

Convert lengths and add or subtract feet and inches.

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Convert a length

Feet and inches

Adds and subtracts with proper carrying at twelve.

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Second

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Quick Tool Overview

The Length Calculator converts a length into every other unit at once — millimetres through kilometres alongside inches, feet, yards and miles — and includes a feet-and-inches calculator that carries at twelve, which is the part that saves real time on site.

What it does
Converts lengths and adds or subtracts feet and inches
You give it
A length in any unit, or two imperial measurements
You get back
A full conversion table, or the carried imperial answer
Best for
Construction, DIY, sewing, workshops and travel
Calculators Free, unlimited use No sign-up Runs in your browser

About the Length Calculator

Convert a length into every other unit at once — millimetres, centimetres, metres and kilometres alongside inches, feet, yards and miles — rather than one pair at a time. Typing a single value fills in the whole table.

There is also a feet-and-inches calculator, which is the part that saves real time on site or in a workshop. Adding 5 feet 9 inches to 3 feet 8 inches is not a decimal sum: the inches carry at twelve, giving 9 feet 5 inches. The calculator handles that carry, works with fractional inches down to sixteenths, and shows the metric equivalent beside every result.

Key features of the Length Calculator

Whole table from one entry

Typing a single value fills in every other unit, rather than converting one pair at a time.

Feet and inches arithmetic

5 feet 9 inches plus 3 feet 8 inches is not a decimal sum — the inches carry at twelve, giving 9 feet 5 inches.

Fractional inches

Works down to sixteenths, which is how measurements are actually written in a workshop.

Metric shown alongside

Every imperial result carries its metric equivalent, so you can work in either.

Metric and imperial together

Millimetres, centimetres, metres and kilometres beside inches, feet, yards and miles.

How to use the Length Calculator

  1. 1

    Enter a length

    Type a value and choose its unit. Every other unit fills in immediately.

  2. 2

    Or use feet and inches

    Switch to the feet and inches panel to add or subtract measurements with proper carrying.

  3. 3

    Copy what you need

    Each converted value can be copied straight to the clipboard.

Frequently asked questions

Exactly 2.54. The inch has been defined as precisely 25.4 millimetres by international agreement since 1959, so this is a definition rather than a measurement.

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