Convert 20 ft2 to mi2

How to convert square feet to square miles

1. Formula: square miles = square feet × 3.587006e-8
2. Put in the value: 20 square feet.
3. Result: 7.174013e-7 square miles.

Square feet to square miles table

Converting the other way: square miles to square feet

square feet = square miles × 27,878,400. So 7.174013e-7 square miles is back to 20 square feet; one square mile is 27,878,400 square feet. See the square miles to square feet table.

Quick estimate in your head

For a rough answer, multiply by about 4e-8: 20 × 4e-8 ≈ 8e-7 mi2, against the exact 7.174013e-7 mi2 (11.5% out). Good enough to check that a calculated result is sensible.

Common mistakes

The usual slip is using the factor the wrong way round. A square foot is smaller than a square mile, so the number of square miles must come out smaller than the number of square feet. If your answer goes the other way, divide instead of multiplying.

About the units

Square foot (ft2) and square mile (mi2) are both units of area. One square foot equals 3.587006e-8 square miles, and one square mile equals 27,878,400 square feet. Results on this page are rounded for display; the conversion itself uses the exact definitions.

Area conversions come up when buying flooring, paint or turf, comparing house and flat sizes, and measuring land and gardens.

20 square feet in other units

The most readable unit for this amount is square meters (1.858061).

• 18,580.61 cm2
• 1.858061 m2
• 0.00000186 km2
• 0.00018581 ha
• 2,880 in2
• 2.222222 yd2
• 0.00045914 ac
• 7.174013e-7 mi2

How this answer was calculated

The result is worked out from the numbers in this page's address when the page is opened, using exact arithmetic wherever possible and rounding only for display. Nothing is copied from a printed table. If you think an answer is wrong, please tell us through the contact page and we will check it.

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