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Feet, inches and metric converter

Switch between feet and inches, millimetres, centimetres and metres.

Jump to the total
Which way

Pick the length you already have.

ft

Whole feet. Leave blank if you only have inches.

in

Inches can be over 12. Two decimal places at most.

Metric unit

The unit for the metric length.

Used when you convert to feet and inches. Millimetres allow 3 decimals, centimetres 4, metres 6.

Result

Feet, inches and metric converter

Which way
Feet and inches to metric
Metric unit
Millimetres

Length

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Enter a length to see the other units.

1 inch = 25.4 mm exactly, from the international yard and pound agreement of 1 July 1959.

Estimate for planning only. This is not tax, legal, accounting or financial advice. Results depend on the figures you enter. Check all numbers, rates and rules with the official source or a qualified professional before relying on them.

How this works and common questions

About this tool

This converter turns feet and inches into millimetres, centimetres and metres, or the other way. You type the length. Nothing is saved.

How it works

One inch is 25.4 millimetres exactly. Feet are 12 inches. The tool adds the feet and inches you type, then shows millimetres, centimetres and metres. The other way, it turns a metric length into feet and inches.

Rules

Metric results from feet and inches are exact for these units. When you convert to feet and inches, inches are rounded to 2 decimals, half up. Leave a box blank only when the other box has the length. A minus sign is not accepted.

Questions

How many millimetres are in an inch?

One inch is 25.4 millimetres exactly, from the international yard and pound agreement of 1 July 1959.

Can I enter feet and inches together?

Yes. Enter feet in one box and inches in the other, for example 5 feet 7 inches.

Why do jobs mix units?

Plans, lumber and suppliers may use feet and inches while others use metric. This helps you match them.

Do I need an account?

No. The tools work without one. You only need to sign in to save your work.

Is what I type saved?

No. Nothing is saved unless you sign in and choose Save. Otherwise it stays on the page.

Do you show ads or sell my information?

No. We show no ads and we do not sell your information.

Is this tax or legal advice?

No. Results are estimates for planning. Check rates and rules with the official source or a qualified professional.

Sign in to save this. Your entries stay on screen.

Estimate for planning only. This is not tax, legal, accounting or financial advice. Results depend on the figures you enter. Check all numbers, rates and rules with the official source or a qualified professional before relying on them.