Convert square feet to square miles
1 ft² = 3.5870 × 10^-8 mi². Change the amount below, or read the formula and the reference table further down.
1 square foot equals
square miles
1 ft² = 3.5870 × 10^-8 mi²
The formula
Square feet and square miles both measure area from the same zero, so a single multiplier does the job.
mi² = ft² × 3.5870 × 10^-8
Going the other way? Convert square miles to square feet.
Square feet to square miles table
Common values, rounded for reading.
| Square feet (ft²) | Square miles (mi²) |
|---|---|
| 1 | 3.5870 × 10^-8 |
| 2 | 7.1740 × 10^-8 |
| 3 | 1.0761 × 10^-7 |
| 4 | 1.4348 × 10^-7 |
| 5 | 1.7935 × 10^-7 |
| 6 | 2.1522 × 10^-7 |
| 7 | 2.5109 × 10^-7 |
| 8 | 2.8696 × 10^-7 |
| 9 | 3.2283 × 10^-7 |
| 10 | 3.5870 × 10^-7 |
| 15 | 5.3805 × 10^-7 |
| 20 | 7.1740 × 10^-7 |
| 25 | 8.9675 × 10^-7 |
| 30 | 0.000001 |
| 40 | 0.000001 |
| 50 | 0.000002 |
| 75 | 0.000003 |
| 100 | 0.000004 |
| 250 | 0.000009 |
| 500 | 0.000018 |
| 1,000 | 0.000036 |
Questions people ask
- How many square miles are in a square foot?
- One square foot equals 3.5870 × 10^-8 square miles.
- How do I convert square feet to square miles by hand?
- Multiply the number of square feet by 3.5870 × 10^-8. For a rough check, 3.5870 × 10^-8 is close enough for most everyday use.
- What is 1 square foot in square miles?
- 1 square foot is 3.5870 × 10^-8 square miles.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.