Area Converter
Convert area units with the factor behind each answer. Area units are the square of the length unit, so the factor is the length factor squared.
1 mm² = 1,973.525241 cmil
Common conversions
- 1 m² = 10.76391042 ft²
- 1 ft² = 0.09290304 m²
- 1 mm² = 0.0015500031 in²
- 1 in² = 645.16 mm²
- 1 ha = 2.471053815 acre
- 1 acre = 0.4046856422 ha
- 1 km² = 0.3861021585 mi²
Why area factors are squared
One inch is 25.4 mm, so one square inch is 25.4 × 25.4 = 645.16 mm². Never apply the length factor to an area.
Conductor cross-section
IEC cables are sized in mm². US cables use AWG and circular mils: 1 kcmil is 1,000 cmil, about 0.5067 mm². Use the wire gauge calculator to convert AWG to mm².
Unit factors
Every unit in terms of the base unit shown. To convert, multiply by the factor of the unit you have and divide by the factor of the unit you want.
| Unit | Equals | What it is |
|---|---|---|
| mm² | 1 × 10⁻⁶ m² | Square millimetre. The usual unit for conductor cross-section in IEC cable sizes. |
| cm² | 0.0001 m² | Square centimetre. |
| m² | 1 m² | Square metre, the SI unit of area. |
| ha | 10,000 m² | Hectare, 10,000 m². |
| km² | 1,000,000 m² | Square kilometre. |
| in² | 0.00064516 m² | Square inch. |
| ft² | 0.09290304 m² | Square foot. Floor area and lighting levels. |
| yd² | 0.83612736 m² | Square yard. |
| acre | 4,046.856422 m² | International acre, 4,046.8564224 m². |
| mi² | 2,589,988.11 m² | Square statute mile. |
| cmil | 5.067074791 × 10⁻¹⁰ m² | Circular mil: the area of a circle one mil in diameter. 1,000 cmil is one kcmil (MCM), used for large US conductors. |
Frequently asked questions
What is the formula to convert mm² to cmil?
cmil = mm² × 1,973.525241. For example, 16 mm² is 31,576.40386 cmil.
How do I convert cmil back to mm²?
mm² = cmil × 0.0005067074791. The Swap button above reverses the direction for any pair of units.
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