Square Mm to Square Meters Converter (mm² to m²)

How to convert square millimeters to square meters

Formulam² = mm² × 0.000001

Multiply the value in square millimeters by 0.000001. To go the other way, multiply by 1,000,000 (or divide by 0.000001).

A square millimeter is smaller than a square meter: it takes 1,000,000 square millimeters to make one square meter.

Worked examples

1 square millimeter1 mm² × 0.000001 = 0.000001 m²
5 square millimeters5 mm² × 0.000001 = 0.000005 m²
10 square millimeters10 mm² × 0.000001 = 0.00001 m²
20 square millimeters20 mm² × 0.000001 = 0.00002 m²
100 square millimeters100 mm² × 0.000001 = 0.0001 m²

Square millimeters to square meters conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Square millimeters to square meters: 0.1–10 mm²
Square millimeters (mm²)	Square meters (m²)
0.1 mm²	1×10⁻⁷ m²
0.25 mm²	2.5×10⁻⁷ m²
0.5 mm²	5×10⁻⁷ m²
1 mm²	0.000001 m²
2 mm²	0.000002 m²
3 mm²	0.000003 m²
4 mm²	0.000004 m²
5 mm²	0.000005 m²
6 mm²	0.000006 m²
7 mm²	0.000007 m²
8 mm²	0.000008 m²
9 mm²	0.000009 m²
10 mm²	0.00001 m²

Square millimeters to square meters: 12–1,000 mm²
Square millimeters (mm²)	Square meters (m²)
12 mm²	0.000012 m²
15 mm²	0.000015 m²
20 mm²	0.00002 m²
25 mm²	0.000025 m²
30 mm²	0.00003 m²
40 mm²	0.00004 m²
50 mm²	0.00005 m²
75 mm²	0.000075 m²
100 mm²	0.0001 m²
250 mm²	0.00025 m²
500 mm²	0.0005 m²
1,000 mm²	0.001 m²

About the units

Square millimeter (mm²)

Used for wire cross-sections in metric countries (e.g. 2.5 mm² cable). One square millimeter equals 0.000001 square meters (m²).

Square meter (m²)

The SI unit of area: a square one metre on each side. Apartment and office floor areas outside the US are usually quoted in m².

Frequently asked questions

How many square meters are in one square millimeter?

There are 0.000001 square meters in one square millimeter, and this value is exact by definition.

How do I convert square millimeters to square meters?

Multiply the number of square millimeters by 0.000001. For example, 10 mm² × 0.000001 = 0.00001 m².

How many square millimeters are in one square meter?

One square meter equals 1,000,000 square millimeters. That is the reverse factor, 1 ÷ 0.000001.

What is 10 square millimeters in square meters?

10 mm² = 0.00001 m².

Is this mm² to m² converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.

Square Mm to Square Meters Converter