cm² to in² — convert square centimetres to square inches
Exact 1 ÷ 6.4516 = 0.15500031
1 square centimetre in other units
| Square millimetres | 100 | mm² |
|---|---|---|
| Square metres | 0.0001 | m² |
| Ares | 0.000001 | a |
| Hectares | 1e-8 | ha |
| Square kilometres | 1e-10 | km² |
| Square inches | 0.15500031 | in² |
| Square feet | 0.001076391042 | ft² |
| Square yards | 0.000119599005 | yd² |
| Acres | 2.4711e-8 | ac |
| Square miles | 3.861e-11 | mi² |
cm² to in² at a glance
| Square centimetres | Square inches |
|---|---|
| 1 cm² | 0.15500031 in² |
| 2 cm² | 0.31000062 in² |
| 3 cm² | 0.46500093 in² |
| 5 cm² | 0.77500155 in² |
| 10 cm² | 1.550003 in² |
| 20 cm² | 3.100006 in² |
| 25 cm² | 3.875008 in² |
| 50 cm² | 7.750016 in² |
| 100 cm² | 15.500031 in² |
| 250 cm² | 38.750078 in² |
| 500 cm² | 77.500155 in² |
| 1,000 cm² | 155.00031 in² |
How to convert square centimetres to square inches
Multiply by 0.15500031 — one square centimetre is 0.15500031 square inches. That factor is exact: it comes from the definition of the units rather than from a measurement, so it will not change and does not need rounding.
Working 1 ÷ 6.4516 = 0.15500031
Questions
How many square inches are in a square centimetre?
One square centimetre is 0.15500031 square inches. This figure is exact — it comes from the definition of the unit, not a measurement.
What is 1 square centimetre in square inches?
1 square centimetre is 0.15500031 square inches. The working is 1 ÷ 6.4516 = 0.15500031.
How big is an acre, really?
About 4,047 square metres, or roughly 70 by 58 metres if it were square — though it rarely is. The traditional definition was one chain by one furlong, the strip a team of oxen could plough in a day, which is why it is a long thin shape rather than a round number.
How many acres in a hectare?
A hectare is about 2.47 acres. The hectare is the tidier unit: it is exactly 10,000 square metres, or a square 100 metres on each side. Most of the world quotes land in hectares and only the English-speaking countries still lean on the acre.
Why isn't a square foot 12 square inches?
Because area scales with the square of length. A foot is 12 inches, so a square foot is 12 × 12 = 144 square inches. The same catch doubles again for volume, where a cubic foot is 1,728 cubic inches.
What area is a football pitch?
There is no single answer, which is why it is a poor unit despite being a popular one. FIFA allows pitches between roughly 4,050 and 10,800 square metres, so "the size of a football pitch" can vary by a factor of more than two.