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in to cm Converter

Convert inches to centimetres (or centimetres to inches) instantly, with mm, m, and feet for context.

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

Quick Summary

Use this when you need:

Check packaging or luggage sizes in centimetres when only inches are given
Convert DIY instructions from inches into centimetres for metric tools
Publish product dimensions in both inches and centimetres without double entry

You’ll get:Length

How this is calculated

Formula:

centimetres = inches * 2.54

In plain language:

One inch equals exactly 2.54 centimetres. Values are normalized to metres to keep precision across centimetres, millimetres, inches, feet, and metres.

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

Check packaging or luggage sizes in centimetres when only inches are given
Convert DIY instructions from inches into centimetres for metric tools
Publish product dimensions in both inches and centimetres without double entry

Last updated: November 28, 2025

Inches to centimetres explained

Because 1 inch = 2.54 centimetres exactly, moving between the two is straightforward. This converter lets you enter inches once and read centimetres, millimetres, metres, or feet without extra math.

How the conversion works

The inch-to-centimetre factor is fixed by definition:

\text{cm} = \text{in} \times 2.54

Reverse it for centimetres back to inches:

\text{in} = \dfrac{\text{cm}}{2.54}

Feet, metres, and millimetres share the same metre base: $1\,\text{ft} = 0.3048\,\text{m}$ ; $\text{m} = \text{cm} / 100$ ; $\text{mm} = \text{cm} \times 10$ .

Units and conversions

Unit	Symbol	Relation
Inch	in	$1\,\text{in} = 2.54\,\text{cm}$
Centimetre	cm	$1\,\text{cm} = 0.01\,\text{m}$
Millimetre	mm	$1\,\text{mm} = 0.001\,\text{m}$
Metre	m	base
Foot	ft	$1\,\text{ft} = 12\,\text{in} = 30.48\,\text{cm}$

Worked examples

Box dimension in inches to centimetres
$10\,\text{in} \times 2.54 = 25.4\,\text{cm}$ .
Centimetres back to inches
$100\,\text{cm} \div 2.54 = 39.3701\,\text{in}$ .
Convert a foot to centimetres
$1\,\text{ft} \times 30.48 = 30.48\,\text{cm}$ .

Tips and pitfalls

Publish both inches and centimetres on packaging to reduce customs or carrier confusion.
Keep two to three decimals when converting small parts; round at the end of your workflow, not mid-way.
For recipes or sewing patterns, millimetres often give clearer cuts—convert to cm or in only for presentation.

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

Inches to centimetres explained

How the conversion works

The inch-to-centimetre factor is fixed by definition:

\text{cm} = \text{in} \times 2.54

Reverse it for centimetres back to inches:

\text{in} = \dfrac{\text{cm}}{2.54}

Feet, metres, and millimetres share the same metre base: $1\,\text{ft} = 0.3048\,\text{m}$ ; $\text{m} = \text{cm} / 100$ ; $\text{mm} = \text{cm} \times 10$ .

Units and conversions

Unit	Symbol	Relation
Inch	in	$1\,\text{in} = 2.54\,\text{cm}$
Centimetre	cm	$1\,\text{cm} = 0.01\,\text{m}$
Millimetre	mm	$1\,\text{mm} = 0.001\,\text{m}$
Metre	m	base
Foot	ft	$1\,\text{ft} = 12\,\text{in} = 30.48\,\text{cm}$

Worked examples

Box dimension in inches to centimetres
$10\,\text{in} \times 2.54 = 25.4\,\text{cm}$ .
Centimetres back to inches
$100\,\text{cm} \div 2.54 = 39.3701\,\text{in}$ .
Convert a foot to centimetres
$1\,\text{ft} \times 30.48 = 30.48\,\text{cm}$ .

Tips and pitfalls

Publish both inches and centimetres on packaging to reduce customs or carrier confusion.
Keep two to three decimals when converting small parts; round at the end of your workflow, not mid-way.
For recipes or sewing patterns, millimetres often give clearer cuts—convert to cm or in only for presentation.

Quick Summary

Calculator Tool

How this is calculated

What these terms mean

Length

When to use this calculator

Inches to centimetres 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

Inches to centimetres explained

How the conversion works

Units and conversions

Worked examples

Tips and pitfalls

References and further reading

Frequently Asked Questions

Related Calculators

Inch Converter

Feet to Meters Converter

Acreage Calculator

Angstrom to nm converter

Centimeter Calculator

cm to ft in. converter

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