Square Centimeters to Square Millimeters
Unit ConversionConvert square centimeters to square millimeters. 1 square centimeter equals exactly 100 square millimeters, with a conversion table, worked examples and the reverse conversion.
Square Millimeters
Equivalent area in square millimeters
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SponsoredThis converter turns square centimeters into square millimeters (cm2 to mm2). Enter a value and the result updates as you type. 1 square centimeter equals exactly 100 square millimeters.
Square millimeters measure small things, such as the cross-section of an electrical wire or the area of a camera sensor, while square centimeters suit a coin, a label or a photo. A centimeter is 10 millimeters, so a square centimeter is 10 by 10 millimeters, 100 square millimeters. Multiplying by 10 instead of 100 is the most common mistake.
The result is rounded to 2 decimal places, but the factor behind it never is, so long chains of conversions stay accurate. You can type decimals, thousands separators or fractions such as 2 1/2, and the conversion table below lists common values.
How to Convert Square Centimeters to Square Millimeters
To convert square centimeters to square millimeters, multiply by 100. For example, 12 square centimeters equals exactly 1,200 square millimeters.
To go from square millimeters back to square centimeters, divide by 100. For example, 450 square millimeters equals exactly 4.5 square centimeters.
Square Centimeters to Square Millimeters Conversion Table
Common values in square centimeters converted to square millimeters, rounded to 2 decimal places.
| Square Centimeters | Square Millimeters |
|---|---|
| 0.01 cm² | 1 mm² |
| 0.1 cm² | 10 mm² |
| 0.5 cm² | 50 mm² |
| 1 cm² | 100 mm² |
| 2 cm² | 200 mm² |
| 5 cm² | 500 mm² |
| 10 cm² | 1,000 mm² |
| 12 cm² | 1,200 mm² |
| 25 cm² | 2,500 mm² |
| 50 cm² | 5,000 mm² |
| 100 cm² | 10,000 mm² |
Area Scales by the Square of Length
Every area factor is a length factor multiplied by itself. Ten millimeters make a centimeter, so a hundred square millimeters make a square centimeter. The same rule gives the other metric steps, and the Centimeters to Millimeters Converter shows the length step on its own.
| Length Step | Length Factor | Area Factor |
|---|---|---|
| mm to cm | 10 | 100 |
| cm to m | 100 | 10,000 |
| mm to m | 1,000 | 1,000,000 |
| m to km | 1,000 | 1,000,000 |
A wire's cross-section is the area of a circle, so it comes from the diameter, and the Area of a Circle Calculator works it out in whatever length unit you enter.
Frequently Asked Questions
How many square millimeters is 2.5 square centimeters?
2.5 square centimeters equals exactly 250 square millimeters.
What is a 2.5 mm² wire in square centimeters?
2.5 square millimeters equals exactly 0.025 square centimeters.
How do I write square millimeters?
As mm², sq mm or mm2. They all mean the same unit, the area of a square 1 millimeter on each side.
How many square millimeters is 7 square centimeters?
7 square centimeters equals exactly 700 square millimeters.
What happens if I enter a negative number?
The result shows a dash. An area is a size, so it is never below zero; a negative value usually means a typing mistake, such as a stray minus sign.
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