How do I convert mm² to mi²?

Use the formula shown above or enter a value to see mm² converted to mi² instantly.

What is the formula for mm² to mi²?

The converter calculates mi² by applying the category-specific conversion factor for Area.

When should I use mm² vs mi²?

mm² and mi² 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 mm² to mi²

Use the live converter below to translate between Square Millimeter (mm²) and Square Mile (mi²). 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

mm² → mi²

Square Millimeter

mm²

Square Mile

3.86102×10^-13

mi²

Rounded result (4 decimals max)

Formula

1 mm² = 3.86102×10^-13 mi²

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 mi² to mm².

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mm² to mi² 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 Millimeter (mm²)	Square Mile (mi²)
0.25 mm²	9.65255×10^-14 mi²
0.5 mm²	1.93051×10^-13 mi²
1 mm²	3.86102×10^-13 mi²
2 mm²	7.72204×10^-13 mi²
5 mm²	1.93051×10^-12 mi²
10 mm²	3.86102×10^-12 mi²
25 mm²	9.65255×10^-12 mi²
100 mm²	3.86102×10^-11 mi²

mi² back to mm²

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

Square Mile (mi²)	Square Millimeter (mm²)
0.25 mi²	6.47497×10^11 mm²
0.5 mi²	1.29499×10^12 mm²
1 mi²	2.58999×10^12 mm²
2 mi²	5.17998×10^12 mm²
5 mi²	1.29499×10^13 mm²
10 mi²	2.58999×10^13 mm²
25 mi²	6.47497×10^13 mm²
100 mi²	2.58999×10^14 mm²