20 mm² to ft² — 20 square millimetres in square feet
Exact 20 ÷ 92,903.04 = 0.000215278208
20 square millimetres in other units
| Square centimetres | 0.2 | cm² |
|---|---|---|
| Square metres | 0.00002 | m² |
| Ares | 2e-7 | a |
| Hectares | 2e-9 | ha |
| Square kilometres | 2e-11 | km² |
| Square inches | 0.03100006 | in² |
| Square feet | 0.000215278208 | ft² |
| Square yards | 0.000023919801 | yd² |
| Acres | 4.9421e-9 | ac |
| Square miles | 7.722e-12 | mi² |
mm² to ft² at a glance
| Square millimetres | Square feet |
|---|---|
| 1 mm² | 0.00001076391 ft² |
| 2 mm² | 0.000021527821 ft² |
| 3 mm² | 0.000032291731 ft² |
| 5 mm² | 0.000053819552 ft² |
| 10 mm² | 0.000107639104 ft² |
| 20 mm² | 0.000215278208 ft² |
| 25 mm² | 0.00026909776 ft² |
| 50 mm² | 0.000538195521 ft² |
| 100 mm² | 0.001076391042 ft² |
| 250 mm² | 0.002690977604 ft² |
| 500 mm² | 0.005381955208 ft² |
| 1,000 mm² | 0.01076391 ft² |
How to convert square millimetres to square feet
Multiply by 0.00001076391 — one square millimetre is 0.00001076391 square feet. 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 20 ÷ 92,903.04 = 0.000215278208
What these units are
The square millimetre and the square foot are covered in the area unit guide, along with every other unit on this page.
Questions
How many square feet are in a square millimetre?
One square millimetre is 0.00001076391 square feet. This figure is exact — it comes from the definition of the unit, not a measurement.
What is 20 square millimetres in square feet?
20 square millimetres is 0.000215278208 square feet. The working is 20 ÷ 92,903.04 = 0.000215278208.
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.