Square Miles to Square Feet converter (mi² to ft²)
Convert Square Miles (mi²) to Square Feet (ft²) with this free calculator. Type a value, press Convert, and the page applies the same factor shown in the formula below — no rounded shortcut, and nothing is stored on a server.
Square Feet to Square Miles (ft² to mi²) ►
How to convert Square Miles to Square Feet
1 square mile (mi²) is equal to 27,878,400 square feet (ft²).
ft² = mi² × 27,878,400
Multiply the area in square miles by 27,878,400:
Example: Convert 1 mi² to ft²:
ft² = 1 × 27,878,400 = 27,878,400 ft²
What is a Square Miles?
The Square Miles (mi²) is the starting or target unit on this page. Use the calculator above to convert values without looking up the factor by hand.
What is a Square Feet?
The Square Feet (ft²) is the starting or target unit on this page. Use the calculator above to convert values without looking up the factor by hand.
This page converts area from Square Miles into Square Feet. One mi² equals 27878400 ft².
Square Miles to Square Feet conversion table
Common mi² values and the matching ft² result, calculated with the same factor as the widget. Highlight a nearby row if you want a quick check without entering a number.
| Square Miles (mi²) | Square Feet (ft²) |
|---|---|
| 1 mi² | 27878400 ft² |
| 2 mi² | 55756800 ft² |
| 5 mi² | 139392000 ft² |
| 10 mi² | 278784000 ft² |
| 20 mi² | 557568000 ft² |
| 50 mi² | 1393920000 ft² |
| 100 mi² | 2787840000 ft² |
How this calculator works
The form on this page is a Square Miles-to-Square Feet converter. After you enter a number, JavaScript multiplies or rearranges it with the published conversion factor and writes the ft² result in the output box. The step-by-step panel repeats the arithmetic so you can copy it into homework or a spreadsheet.
Reviewed by Hamsen, founder of GigaTables and a biology engineer. See the about page for how formulas are checked before a tool is published.
FAQ
How many ft² are in 1 mi²?
1 mi² = 27878400 ft².
How do I convert Square Miles to Square Feet?
Multiply the area in square miles by 27,878,400:
Is this mi² to ft² converter free?
Yes. GigaTables calculators are free to use in a browser. You do not need an account, and the values you type are not uploaded.