How do I convert mi² to ft²?

Use the formula shown above or enter a value to see mi² converted to ft² instantly.

What is the formula for mi² to ft²?

The converter calculates ft² by applying the category-specific conversion factor for Area.

When should I use mi² vs ft²?

mi² and ft² are both part of the Area category; pick the unit that matches your measurement context (e.g., scale, region, or industry standard).

Area Converter & Surface Reference

Convert mi² to ft²

Use the live converter below to translate between Square Mile (mi²) and Square Foot (ft²). Scroll further for quick examples, formula tips, and related units.

Formula insight: Most unit conversions use a simple multiplication or division by a conversion factor. The calculator shows the exact formula used.

Convert

mi² → ft²

Square Mile

mi²

Square Foot

27,878,400

ft²

Rounded result (4 decimals max)

Formula

1 mi² = 27,878,400 ft²

Conversion sourcesTap or click to view references

The International System of Units (SI) — NIST Special Publication 330
National Institute of Standards and Technology (NIST). The SI Brochure (SP 330) is the definitive English edition of the BIPM SI tables. NIST’s edition lists the official constants and conversion factors tying inch-pound units to SI, which SwapUnits applies for length, mass, temperature, pressure, volume, and related conversions. See /standards/nist-si-tenfold for the complete decimal multiple/submultiple table. View source · View SI table

Results update as you type. Swap the direction to convert back from ft² to mi².

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mi² to ft² quick table

Multiply any row by the same factor to scale results. Use the converter above to enter exact values with your own units.

Square Mile (mi²)	Square Foot (ft²)
0.25 mi²	6,969,600 ft²
0.5 mi²	13,939,200 ft²
1 mi²	27,878,400 ft²
2 mi²	55,756,800 ft²
5 mi²	139,392,000 ft²
10 mi²	278,784,000 ft²
25 mi²	696,960,000 ft²
100 mi²	2.78784×10^9 ft²

ft² back to mi²

Keep the reciprocal handy when double-checking calculations or undoing a conversion.

Square Foot (ft²)	Square Mile (mi²)
0.25 ft²	8.96752×10^-9 mi²
0.5 ft²	1.7935×10^-8 mi²
1 ft²	3.58701×10^-8 mi²
2 ft²	7.17401×10^-8 mi²
5 ft²	0 mi²
10 ft²	0 mi²
25 ft²	0 mi²
100 ft²	0 mi²