How many millimetres are in a metre?

There are exactly 1,000 millimetres in one metre. The prefix 'milli' means one-thousandth, so a millimetre is one-thousandth of a metre (0.001 m). To convert millimetres to metres, divide by 1,000. For example, 500 mm equals 0.5 m, and 2,500 mm equals 2.5 m.

How do I convert mm to m without a calculator?

To convert millimetres to metres by hand, simply move the decimal point three places to the left (or divide by 1,000). For example: 150 mm becomes 0.150 m; 3,200 mm becomes 3.200 m; 75 mm becomes 0.075 m. Since 1 m = 1,000 mm, dividing by 1,000 is all that is needed.

What is 1 mm in metres?

1 millimetre equals 0.001 metres (one-thousandth of a metre). It also equals 0.1 centimetres and 0.000001 kilometres. Millimetres are commonly used in engineering, construction, and manufacturing where fine precision is needed.

MM to M Conversion

Convert millimetres to metres instantly. Enter a value in millimetres and get the result in metres, centimetres, and kilometres. You can also convert metres back to millimetres using the reverse field.

Calculate.co.nz is proud to be partnered with Premium Homes, a recognised leader in eco-friendly, sustainable, and energy-efficient homebuilding. With a dedicated team and award-winning experience, they create homes that prioritise health, comfort, and long-term performance. Their founders, Andrew and Kelly, set out to raise the standard of residential construction in New Zealand by combining practical building expertise with a clear commitment to doing things better for homeowners.

Standard conversion International System of Units (SI). 1 m = 1,000 mm exactly.

Millimetres to Metres

Millimetres (mm)

Common values (optional shortcut)

Metres to Millimetres (Reverse)

Metres (m)

Common values (optional shortcut)

Conversion Results

Metres
1
m

Centimetres

100

Kilometres

0.001

Millimetres

1,000

mm (input)

Conversion Breakdown

Input (mm)1,000 mm

Divide by1,000

Result (m)1 m

In centimetres100 cm

In kilometres0.001 km

Worked Example

Formulam = mm / 1,000

Input1,000 mm

Calculation1,000 / 1,000

Answer1 m

Also equals100 cm / 0.001 km

Quick Reference Conversion Table

Millimetres (mm)	Metres (m)	Centimetres (cm)	Kilometres (km)

How to Convert Millimetres to Metres

The conversion from millimetres (mm) to metres (m) is straightforward because both are metric units based on powers of ten. There are exactly 1,000 millimetres in one metre. To convert, divide the millimetre value by 1,000.

Formula: metres = millimetres / 1,000

Equivalently, you can multiply by 0.001 (since 1 mm = 0.001 m).

Metric Length Units

The metric system uses prefixes to indicate multiples or fractions of a base unit. For length, the base unit is the metre (m):

Unit	Symbol	Relation to metre	Example
Kilometre	km	1 km = 1,000 m	Road distances
Metre	m	Base unit	Room dimensions
Centimetre	cm	1 cm = 0.01 m	Clothing sizes
Millimetre	mm	1 mm = 0.001 m	Engineering tolerances

Where Millimetres Are Used

Millimetres are the standard unit for precision measurements in construction, engineering, and manufacturing. In New Zealand, building plans and specifications are typically drawn in millimetres. Door and window sizes, timber dimensions, pipe diameters, and structural member sizes are all given in mm. Converting to metres is useful when calculating areas or volumes, or when comparing measurements with larger-scale drawings.

Converting Back: Metres to Millimetres

To convert metres to millimetres, multiply by 1,000. For example, 2.4 m (a standard NZ ceiling height) equals 2,400 mm. Use the reverse input field above to convert in that direction.

Related Conversions

1 mm = 0.1 cm (divide by 10 to get centimetres)
1 mm = 0.001 m (divide by 1,000 to get metres)
1 mm = 0.000001 km (divide by 1,000,000 to get kilometres)
1 mm = approximately 0.03937 inches

Related Calculators

Essential Calculators: browse all converters and tools.
CM to M Converter: convert centimetres to metres.
CM to MM Converter: convert centimetres to millimetres.
Kilometre to Metre Converter: convert km to m.
Imperial to Metric Conversion: convert inches, feet, and miles to metric units.

Sources and method: International System of Units (SI), Bureau International des Poids et Mesures (BIPM). 1 metre = 1,000 millimetres exactly, by definition. No rounding is applied; this is an exact conversion.

This converter uses the exact SI definition: 1 m = 1,000 mm. All results are mathematically exact for the input provided.

If you've found a bug, or would like to contact us, or learn more about James Graham and Calculate.co.nz.

Calculate.co.nz is partnered with Interest.co.nz for New Zealand's highest quality calculators and financial analysis.

Calculate.co.nz is the sister site of CalculatorHub.com, the world's largest calculator website by tool count.

All calculators and tools are provided for educational and indicative purposes only and do not constitute financial advice.

Calculate.co.nz is proudly part of the Realtor.co.nz group, New Zealand's leading property transaction literacy platform, helping Kiwis understand the home buying and selling process from start to finish. Whether you're a first home buyer navigating your first property purchase, an investor evaluating your next acquisition, or a homeowner planning to sell, Realtor.co.nz provides clear, independent, and trustworthy guidance on every step of the New Zealand property transaction journey.

Calculate.co.nz is also partnered with Health Based Building and Premium Homes to promote informed choices that lead to better long-term outcomes for Kiwi households.

Calculate.co.nz is hosted in Auckland via SiteHost new Zealand.

All content on this website, including calculators, tools, source code, and design, is protected under the Copyright Act 1994 (New Zealand). No part of this site may be reproduced, copied, distributed, stored, or used in any form without prior written permission from the owner.

About & trust: Why Calculate is NZ's most comprehensive · By the Numbers · How we compare · Editorial standards · How we keep data current · NZ finance glossary · Research & data · Financial literacy NZ · About · Privacy policy · Terms of use

Reviewed and maintained. Last reviewed 2026-07-02 and checked on a twice-monthly cycle against IRD, RBNZ and Stats NZ. How we keep data current.