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Imperial to Metric Converter

Convert inches, feet, yards, or miles into metric units like millimetres, centimetres, metres, and kilometres.

Formula shown0 inputs definedUpdated Nov 2025By CalcuTotal TeamFree, no sign-up

Quick Summary

Use this when you need:

Convert construction specs from feet and inches into metres for global teams
Report travel distances in both miles and kilometres
Normalize yard or mile measurements into centimetres for packaging and product pages

You’ll get:Length

How this is calculated

Formula:

metric_length = imperial_length * factor

In plain language:

Meters act as the base. Each imperial unit is converted to meters (1 in = 0.0254 m, 1 ft = 0.3048 m, 1 yd = 0.9144 m, 1 mi = 1609.344 m) and then rescaled into the desired metric unit.

The formula is always visible so you can verify the math and explain your numbers to anyone who asks.

What these terms mean

Length

Length used in the calculation.

When to use this calculator

Convert construction specs from feet and inches into metres for global teams
Report travel distances in both miles and kilometres
Normalize yard or mile measurements into centimetres for packaging and product pages

Last updated: November 28, 2025

Imperial to metric explained

Construction specs, apparel charts, and travel distances often show up in inches, feet, yards, or miles. This converter translates those values into millimetres, centimetres, metres, or kilometres using exact SI definitions so you can publish both systems side by side.

How the conversion works

Each imperial unit is first turned into metres, then rescaled into the metric unit you choose:

Inches: $1\,\text{in} = 0.0254\,\text{m}$
Feet: $1\,\text{ft} = 0.3048\,\text{m}$
Yards: $1\,\text{yd} = 0.9144\,\text{m}$
Miles: $1\,\text{mi} = 1{,}609.344\,\text{m}$

Metric outputs come from multiplying the metre value by $1{,}000$ for millimetres, $100$ for centimetres, or dividing by $1{,}000$ for kilometres.

Units and conversions

Imperial input	To metres	Metric outputs
Inch (in)	$0.0254\,\text{m}$	mm, cm, m, km
Foot (ft)	$0.3048\,\text{m}$	mm, cm, m, km
Yard (yd)	$0.9144\,\text{m}$	mm, cm, m, km
Mile (mi)	$1{,}609.344\,\text{m}$	mm, cm, m, km

Worked examples

Site plan in feet to metres
$10\,\text{ft} \times 0.3048 = 3.048\,\text{m}$ .
Hardware spec in inches to centimetres
$100\,\text{in} \times 2.54 = 254\,\text{cm}$ .
Road distance in miles to kilometres
$3\,\text{mi} \times 1.609344 = 4.828032\,\text{km}$ .

Tips and pitfalls

Round only at the end; small inch values can lose accuracy if you round before converting.
When sharing across teams, show both the original imperial value and the metric result to avoid misreads.
For areas or volumes, convert each linear dimension first, then square or cube to keep precision.

References and further reading

Frequently Asked Questions

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Calculator info

Version:: v1.0.0
Last reviewed:: Nov 28, 2025
Sensitivity:: low

Last updated: November 28, 2025

Imperial to metric explained

How the conversion works

Each imperial unit is first turned into metres, then rescaled into the metric unit you choose:

Inches: $1\,\text{in} = 0.0254\,\text{m}$
Feet: $1\,\text{ft} = 0.3048\,\text{m}$
Yards: $1\,\text{yd} = 0.9144\,\text{m}$
Miles: $1\,\text{mi} = 1{,}609.344\,\text{m}$

Metric outputs come from multiplying the metre value by $1{,}000$ for millimetres, $100$ for centimetres, or dividing by $1{,}000$ for kilometres.

Units and conversions

Imperial input	To metres	Metric outputs
Inch (in)	$0.0254\,\text{m}$	mm, cm, m, km
Foot (ft)	$0.3048\,\text{m}$	mm, cm, m, km
Yard (yd)	$0.9144\,\text{m}$	mm, cm, m, km
Mile (mi)	$1{,}609.344\,\text{m}$	mm, cm, m, km

Worked examples

Site plan in feet to metres
$10\,\text{ft} \times 0.3048 = 3.048\,\text{m}$ .
Hardware spec in inches to centimetres
$100\,\text{in} \times 2.54 = 254\,\text{cm}$ .
Road distance in miles to kilometres
$3\,\text{mi} \times 1.609344 = 4.828032\,\text{km}$ .

Tips and pitfalls

Round only at the end; small inch values can lose accuracy if you round before converting.
When sharing across teams, show both the original imperial value and the metric result to avoid misreads.
For areas or volumes, convert each linear dimension first, then square or cube to keep precision.

Quick Summary

Calculator Tool

How this is calculated

What these terms mean

Length

When to use this calculator

Imperial to metric explained

How the conversion works

Units and conversions

Worked examples

Tips and pitfalls

References and further reading

Frequently Asked Questions

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Calculator info

Imperial to metric explained

How the conversion works

Units and conversions

Worked examples

Tips and pitfalls

References and further reading

Frequently Asked Questions

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