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Square Millimeters to Square Centimeters Converter

Convert square millimeters (mm²) to square centimeters (cm²), with the formula, a conversion table and exact factors.

Change the values and press Calculate to work out your own figures.

Enter an area, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.

A number, fraction (3/8), mixed number (1 1/2), scientific notation (2.5e6) or a simple sum such as 2*3.
The unit you want the answer in. Swap exchanges the two units.
Result
0.01 cm²
square miles
3.86102158542 × 10⁻¹³ sq mi
acres
2.47105381467 × 10⁻¹⁰ ac
square yards
1.1959900463 × 10⁻⁶ sq yd
square feet
1.07639104167 × 10⁻⁵ sq ft
square inches
0.00155000310001 sq in
square kilometers
1 × 10⁻¹² km²
hectares
1 × 10⁻¹⁰ ha
ares
1 × 10⁻⁸ a
square meters
1 × 10⁻⁶ m²
square micrometers
1,000,000 µm²

1 mm² = 0.01 cm²

Show the working
  1. 1 mm² = 0.01 cm²
  2. 1 × 0.01 = 0.01 cm²

How to convert square millimeters to square centimeters

1 mm² = 0.01 cm², so multiply by 0.01 to go from square millimeters to square centimeters. Going the other way, 1 cm² = 100 mm².

cm² = mm² × 0.01
mm² = cm² × 100

Worked example:

1 mm² = 0.01 cm²
5 × 0.01 = 0.05 cm²

Square Millimeters to square centimeters table

Square MillimetersSquare Centimeters
1 mm²0.01 cm²
2 mm²0.02 cm²
3 mm²0.03 cm²
4 mm²0.04 cm²
5 mm²0.05 cm²
6 mm²0.06 cm²
7 mm²0.07 cm²
8 mm²0.08 cm²
9 mm²0.09 cm²
10 mm²0.1 cm²
15 mm²0.15 cm²
20 mm²0.2 cm²
25 mm²0.25 cm²
30 mm²0.3 cm²
40 mm²0.4 cm²
50 mm²0.5 cm²
75 mm²0.75 cm²
100 mm²1 cm²
250 mm²2.5 cm²
500 mm²5 cm²
1000 mm²10 cm²

About the units

Square Millimeters (mm²)
Square millimeters, a metric unit. Definition: BIPM SI Brochure (SI prefixes).
Square Centimeters (cm²)
Square centimeters, a metric unit. Definition: BIPM SI Brochure (SI prefixes).

Formula version 0.1.0Reviewed