Square Kilometers to Square Miles — Area Converter
Convert square kilometers to square miles instantly with our free area converter. Useful for geography, country area comparisons, and map calculations.
Formula: mi² = km² × 0.386102
KM2 to MI2 Conversion Table
| KM2 | MI2 |
|---|---|
| 1 km² | 0.3861 mi² |
| 10 km² | 3.8610 mi² |
| 1000 km² | 386.10 mi² |
Formula
mi² = km² × 0.386102
Example: 1 km² = 0.3861 mi²
Frequently Asked Questions
Looking for the reverse? MI2 to KM2 Converter
About area conversion
Area conversion is central to real estate, farming, and geography. Square meters, hectares, acres, and square feet measure everything from apartments to nations. 1 hectare equals 10,000 m² or about 2.471 acres. The acre, a medieval English unit originally defined as the area a team of oxen could plow in a day, is still the default for US and UK land sales despite hectares being the international standard.
How the math works
Area units scale as length squared. If 1 m = 3.28084 ft, then 1 m² = 10.7639 ft². The hectare (ha) equals exactly 10,000 m² — a square 100 meters on each side. An acre is 4,046.86 m², defined historically as one chain (66 ft) by one furlong (660 ft). These conversions are fixed and don't depend on latitude or country (unlike land taxes, which do).
When you'll use this conversion
- Real estate listings (m² in most countries, sq ft in US real estate)
- Farm and ranch size (hectares globally, acres in US)
- National parks, forests, and conservation areas
- Construction and flooring materials
- Roofing and landscaping estimates
- Urban planning and zoning
A bit of history
The acre's unusual number (4,046.86 m²) reflects its medieval agricultural origin — it was literally the area one man with one ox could plow in one day. The hectare was introduced during the French metric reform as a more regular unit (exactly 100 × 100 m). Most of the world adopted the hectare for land measurement, but the US and parts of the UK and India still use acres for residential and rural land.
Common mistakes
- Forgetting that doubling linear dimensions quadruples area — not doubles
- Confusing square feet with feet squared (they mean the same but cause confusion)
- Using hectares when tenths-of-hectare (1,000 m²) or ares (100 m²) are more appropriate
- Ignoring that advertised 'square meters' in real estate may include balconies or not
Quick tips
- Quick reference: 1 hectare ≈ 2.5 acres; 1 acre ≈ a US football field (without end zones)
- Apartments: 50 m² ≈ 540 sq ft — a comfortable one-bedroom
- Farm size: smallholder is typically 1–5 hectares (2.5–12 acres)