1 mi² = 27878400 ft² (square mile → square foot)
1 mi² = 27878400 ft²
1 square mile equals 27878400 square feet. To convert square miles to square feet, multiply the square mile value by 27878400. For quick reference: 1 mi² = 27878400 ft², 5 mi² = 139392000 ft², 10 mi² = 278784000 ft², 100 mi² = 2787840000 ft².
Square feet = Square miles × 27878400Square miles to square feet multiplies by 27,878,400 exactly. One square mile contains just under 28 million square feet. The number mostly serves as a denominator — computing what fraction of a square-mile census tract is covered by buildings, parking, or parkland when those features are measured in square feet.
Start with your value in square miles.
Multiply the square mile value by 27878400. This is the exact conversion factor from square miles to square feet.
The product is your value in square feet. For example, 5 mi² × 27878400 = 139392000 ft².
The exact factor from square miles to square feet is 27878400.
Square feet = Square miles × 27878400
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Square miles (mi²) | Square feet (ft²) |
|---|---|
| 0.1 mi² | 2787840 ft² |
| 0.25 mi² | 6969600 ft² |
| 0.5 mi² | 13939200 ft² |
| 1 mi² | 27878400 ft² |
| 2 mi² | 55756800 ft² |
| 3 mi² | 83635200 ft² |
| 4 mi² | 111513600 ft² |
| 5 mi² | 139392000 ft² |
| 6 mi² | 167270400 ft² |
| 7 mi² | 195148800 ft² |
| 8 mi² | 223027200 ft² |
| 9 mi² | 250905600 ft² |
| 10 mi² | 278784000 ft² |
| 12 mi² | 334540800 ft² |
| 15 mi² | 418176000 ft² |
| 20 mi² | 557568000 ft² |
| 25 mi² | 696960000 ft² |
| 30 mi² | 836352000 ft² |
| 40 mi² | 1115136000 ft² |
| 50 mi² | 1393920000 ft² |
| 60 mi² | 1672704000 ft² |
| 70 mi² | 1951488000 ft² |
| 75 mi² | 2090880000 ft² |
| 80 mi² | 2230272000 ft² |
| 90 mi² | 2509056000 ft² |
| 100 mi² | 2787840000 ft² |
| 120 mi² | 3345408000 ft² |
| 150 mi² | 4181760000 ft² |
| 200 mi² | 5575680000 ft² |
| 250 mi² | 6969600000 ft² |
| 300 mi² | 8363520000 ft² |
| 400 mi² | 11151360000 ft² |
| 500 mi² | 13939200000 ft² |
| 600 mi² | 16727040000 ft² |
| 750 mi² | 20908800000 ft² |
| 800 mi² | 22302720000 ft² |
| 1000 mi² | 27878400000 ft² |
| 1200 mi² | 33454080000 ft² |
| 1500 mi² | 41817600000 ft² |
| 2000 mi² | 55756800000 ft² |
| 2500 mi² | 69696000000 ft² |
| 3000 mi² | 83635200000 ft² |
| 4000 mi² | 111513600000 ft² |
| 5000 mi² | 139392000000 ft² |
| 7500 mi² | 209088000000 ft² |
| 10000 mi² | 278784000000 ft² |
| 20000 mi² | 557568000000 ft² |
| 50000 mi² | 1393920000000 ft² |
| 100000 mi² | 2787840000000 ft² |
| 1000000 mi² | 27878400000000 ft² |
A US survey 'section' is exactly 1 square mile (640 acres). Los Angeles covers about 469 sq mi. In square feet, that gives you: 1 mi² = 27878400 ft², 10 mi² = 278784000 ft², 100 mi² = 2787840000 ft².
The square mile is the imperial unit for large land areas, standard in US geography and census data. One square mile is exactly 2.589988110336 km² (1.609344 km squared), or 640 acres — the basis of the US Public Land Survey System's square-mile 'sections'. Los Angeles covers about 469 square miles.
The square foot is the standard area unit for US and Canadian real estate, and remains common in UK property listings alongside square meters. One square foot is exactly 0.09290304 m² (derived from 1 ft = 0.3048 m squared). A typical US single-family home is 1,500–2,500 sq ft; a two-car garage is about 400–600 sq ft.