Convert mm to meters
Convert mm to meters instantly. 1 mm = 0.001 m. Formula, worked examples and a quick reference table.
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One millimeter equals 0.001 meters. To convert any number of millimeters to meters, multiply by 0.001.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Length conversions come up wherever a measurement crosses a border: a height given in feet and inches on a form that wants centimetres, a running distance recorded in kilometres and compared against miles, a component specified in millimetres and ordered from a supplier working in inches. The conversions themselves are exact — the inch, foot, yard and mile have all been defined in metric terms since 1959 — so any discrepancy comes from rounding, not from the units disagreeing.
mm to meters formula
To go the other way, use millimeter = meter ÷ 0.001.
About these units
The millimetre is the working unit of engineering drawings and machining across most of the world, precise enough that dimensions rarely need decimals.
The metre is defined by the speed of light: the distance light travels in 1/299,792,458 of a second. Every other length unit is now defined against it.
Millimeter is also written millimetre, millimetres and millimeters. Meter is also written metre, metres and meters.
Sources
mm to meters conversion table
| Millimeter | Meter |
|---|---|
| 1 mm | 0.001 m |
| 2 mm | 0.002 m |
| 3 mm | 0.003 m |
| 5 mm | 0.005 m |
| 10 mm | 0.01 m |
| 20 mm | 0.02 m |
| 25 mm | 0.025 m |
| 50 mm | 0.05 m |
| 100 mm | 0.1 m |
| 250 mm | 0.25 m |
| 500 mm | 0.5 m |
| 1,000 mm | 1 m |
Frequently asked questions
How many meters are in a millimeter? +
There are 0.001 meters in one millimeter.
What is 10 mm in m? +
10 mm equals 0.01 m. Multiply 10 by 0.001.
How do I convert meter back to millimeter? +
Use millimeter = meter ÷ 0.001. The converter above handles both directions, or see our dedicated meters to mm page.
How accurate is this millimeter to meter conversion? +
The factor used is 0.001, carried at full double precision. Where a unit has an exact legal definition the factor is exact rather than approximate. Rounding is applied only to the displayed result, so the answer is never a calculation done on an already-rounded number.
Is there a quick way to estimate mm to m in my head? +
Divide by 1,000. That matches the true factor of 0.001 exactly, so no adjustment is needed for a mental estimate.