Area Converter
Free area converter between metric (mm², cm², m², ha, km²) and imperial (in², ft², yd², acre, mi²). Uses exact international definitions. Works in your browser.
Pick a “from” unit, a “to” unit, and a value. Converts between any pair of metric and imperial area units.
Factors
All metric / imperial conversions are exact (since the 1959 yard / pound agreement). All factors below are routed through m².
| Unit | In m² |
|---|---|
| 1 mm² | 0.000001 m² |
| 1 cm² | 0.0001 m² |
| 1 m² | 1 m² |
| 1 ha | 10,000 m² |
| 1 km² | 1,000,000 m² |
| 1 in² | 0.00064516 m² |
| 1 ft² | 0.09290304 m² |
| 1 yd² | 0.83612736 m² |
| 1 acre | 4,046.8564224 m² |
| 1 mi² | 2,589,988.110336 m² |
Quick equivalents
- 1 ha ≈ 2.471 acres (1 acre ≈ 0.4047 ha)
- 1 m² ≈ 10.76 ft²
- A typical football pitch ≈ 7,000 m² ≈ 0.7 ha ≈ 1.7 acres
Worked examples
-
1 ha in m²
1 ha = 10,000 m²
-
1 acre in m²
1 acre = 4,046.8564224 m²
Frequently asked questions
What conversion factors does this use?
All factors come from the international yard / pound agreement (1 yd ≡ 0.9144 m exact). 1 in² = 0.00064516 m², 1 ft² = 0.09290304 m², 1 yd² = 0.83612736 m², 1 acre = 4046.8564224 m². The metric factors are just squared SI prefixes (1 ha = 10,000 m², 1 km² = 1,000,000 m²).
Is the acre based on the international foot?
Yes — this calculator uses the international acre (4046.8564224 m²). The older US survey acre is a hair larger (4046.872610 m²) and shows up in some legacy land records, but for any modern measurement use the international value.
How big is a hectare in real-world terms?
10,000 m² — a square 100 m on a side, or about 1.4 standard football pitches. An acre is roughly 0.4 ha (about 4047 m²). A football pitch is around 0.7 ha (~7000 m²).
How precise are the results?
The math is full double-precision (~15 significant digits) and uses exact conversion factors. The display rounds to ten fractional digits and strips trailing zeros — well beyond meaningful precision for any real surveying.
Statute mile or nautical mile?
Statute (international) mile — 1 mi = 1609.344 m, so 1 mi² = 2,589,988.110336 m². Nautical miles don't have a standard square-area unit; for ocean surface areas use km² or hectares.
Related calculators
Length Converter
Free length / distance converter between metric (mm, cm, m, km) and imperial (in, ft, yd, mi) units. Uses the international definitions. Works in your browser.
ConversionsVolume Converter
Free volume converter between metric (mL, L, m³) and US / UK customary (fl oz, cup, pint, quart, gallon). Includes US tablespoons and teaspoons. Runs in your browser.