What does the Length Converter — Metric & Imperial do?

Convert between mm, cm, metres, km, inches, feet, yards and miles. Includes feet & inches display. All calculations are performed in your browser using official UK rates and thresholds.

Is this calculator free to use?

Yes. All calculators on Calks.uk are completely free to use. No account or registration is required. All calculations run in your browser — no data is collected.

Can I use this on my phone?

Yes. All our calculators are fully responsive and work on smartphones, tablets and desktop computers. The interface adapts to your screen size automatically.

Length Converter — Metric & Imperial

Convert between mm, cm, metres, km, inches, feet, yards and miles. Includes feet & inches display.

Last updated: April 2026 · Source: National Physical Laboratory — The metre

Value

From

Feet & Inches

3' 3.4"

Millimetres

1,000

Metres

1.00

Kilometres

1.00e-3

Inches

39.37

Feet

3.28

Yards

1.09

Miles

6.21e-4

Nautical Miles

5.40e-4

Disclaimer

This calculator is provided for informational purposes only and should not be considered as financial or tax advice. All calculations are performed locally in your browser — no personal data is collected or sent to our servers. Rates and thresholds are sourced from HMRC and GOV.UK and are updated for the current tax year. Always verify results with HMRC or consult a qualified professional before making financial decisions.

How It Works

UK road signs use miles and yards, but most other measurements are metric. This converter handles metres, centimetres, millimetres, kilometres, feet, inches, yards and miles. It is particularly useful for property listings (square footage), DIY projects and running distances.

Key equivalents: one inch is 2.54 cm exactly, one foot is 30.48 cm, one yard is 0.9144 m, and one mile is 1.60934 km. The converter preserves full precision and also rounds to practical decimal places for everyday use.

Example: Converting 5 feet 10 inches to metric

5 ft 10 in = 70 inches total
70 inches × 2.54 = 177.8 cm
177.8 cm = 1.778 m

Source: National Physical Laboratory — The metre

Frequently Asked Questions

What does the Length Converter — Metric & Imperial do?: Convert between mm, cm, metres, km, inches, feet, yards and miles. Includes feet & inches display. All calculations are performed in your browser using official UK rates and thresholds.
Is this calculator free to use?: Yes. All calculators on Calks.uk are completely free to use. No account or registration is required. All calculations run in your browser — no data is collected.
Can I use this on my phone?: Yes. All our calculators are fully responsive and work on smartphones, tablets and desktop computers. The interface adapts to your screen size automatically.