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Square cm to Square Inches Converter

Convert square cm to square inches and back — 1 cm² = 0.15500031 in² (1 in² = 6.4516 cm²). Free, instant, no sign-up, full working shown.

Convert square cm ⇄ square inches

15.5 in²
100 cm² = 15.5 in² (1 cm² = 0.15500031 in²)

Formula: 100 cm² × 0.15500031 = 15.5 in²

How the square cm to square inches converter conversion works

The converter applies in² = cm² × 0.15500031. The inch is exactly 2.54 cm, so a square inch is 2.54² = 6.4516 cm², and the reverse factor is its reciprocal. Going the other way, cm² = in² × 6.4516.

Worked example: a 4 in by 6 in photo print is 24 in² = 24 × 6.4516 = 154.8384 cm², and 100 cm² is 15.5 in².

For the linear pair behind it, use our inches to cm converter; for millimetres, the mm to inches converter.

square cm to square inches converter questions

How many square inches are in a square cm?
0.15500031 in². An inch is 2.54 cm, so a square inch is 6.4516 cm², and 1 ÷ 6.4516 = 0.15500031 in² per cm².
How do I convert square cm to square inches?
Multiply by 0.15500031: in² = cm² × 0.15500031. So 100 cm² is 100 × 0.15500031 = 15.500031 in².
How do I convert square inches back to square cm?
Multiply by 6.4516: cm² = in² × 6.4516. So 10 in² is 64.516 cm².
Why 6.4516?
Because 1 in = 2.54 cm exactly, one square inch is 2.54 × 2.54 = 6.4516 cm² — exact.
What is A4 paper in square inches?
A4 is 21.0 × 29.7 cm = 623.7 cm², which is 623.7 × 0.15500031 = 96.6737 in².

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Sources & official guidance

Estimate only — the square inch is 6.4516 cm² by definition; conversions are exact. See our disclaimer.