How many square feet are in a square metre?

One square metre equals about 10.7639 square feet, because one foot is exactly 0.3048 metres and area scales with the square of length (0.3048² = 0.09290304 m² per square foot).

How many square metres are in an acre?

One acre equals exactly 4,046.8564224 square metres. An acre is defined as 43,560 square feet, and each square foot is 0.09290304 m², so 43,560 × 0.09290304 = 4,046.8564224 m².

How do I convert hectares to acres?

One hectare is 10,000 square metres, which is about 2.4711 acres. To go the other way, one acre is roughly 0.4047 hectares. The converter does both directions exactly.

How many acres are in a square mile?

A square mile contains exactly 640 acres. One mile is 1,609.344 metres, so a square mile is 1,609.344² = 2,589,988.110336 m², which divided by 4,046.8564224 m² per acre gives 640.

Why does area scale with the square of length?

Area is length multiplied by width. If you double a length unit, both sides of a square double, so the area becomes four times larger. That is why the inch-to-metre factor of 0.0254 becomes 0.0254² = 0.00064516 for square inches.

Is my data sent anywhere?

No. Every conversion is pure arithmetic that runs entirely in your browser. No values are uploaded, logged or stored on any server.

Area Converter — Gera Tools

An area converter that turns a single measurement into every common unit at once — from tiny square millimetres up to square miles — covering both the metric system (mm², cm², m², hectare, km²) and imperial / US units (square inch, square foot, square yard, acre, square mile). It is built for anyone sizing a room, a plot of land, a farm field, a roof, or a country: type a number into any field and the other nine update live, so you never have to chain two separate calculators together.

How it works

Every unit is anchored to the square metre, the SI base unit of area. Each unit has an exact factor that says how many square metres one of it contains. When you type a value, the tool multiplies it by that unit’s factor to get a base value in square metres, then divides that base value by every other unit’s factor to fill in the rest. Because the same base value feeds all ten fields, the converter is a true live cross-fill grid rather than a one-direction toy — editing any field instantly rewrites the others.

The factors come straight from the international definitions of the inch, foot, yard and mile. One inch is exactly 0.0254 metres, so a square inch is 0.0254 × 0.0254 = 0.00064516 m². A foot is 0.3048 m, giving 0.09290304 m² per square foot. An acre is defined as 43,560 square feet, so it equals 4,046.8564224 m². A mile is 1,609.344 m, so a square mile is 2,589,988.110336 m² — exactly 640 acres. On the metric side a hectare is 10,000 m² and a square kilometre is 1,000,000 m². Area always scales with the square of a length, which is why the length factors are squared.

Worked example

Suppose you have a building plot listed as half an acre and you want it in metric units for a planning form. Type 0.5 into the acre field. The base value becomes 0.5 × 4,046.8564224 = 2,023.43 m². The grid then shows 0.202343 hectares, 2,023.43 square metres, and 21,780 square feet. Reverse it by typing 2023.43 into the square-metre field and the acre field reads back 0.5 — the round trip is exact because the factors are exact.

Conversion reference

1 unit	Square metres	Also equals
1 mm²	0.000001 m²	0.00155 in²
1 cm²	0.0001 m²	0.155 in²
1 m²	1 m²	10.7639 ft²
1 hectare	10,000 m²	2.47105 acres
1 km²	1,000,000 m²	100 hectares
1 in²	0.00064516 m²	6.4516 cm²
1 ft²	0.09290304 m²	144 in²
1 yd²	0.83612736 m²	9 ft²
1 acre	4,046.8564224 m²	43,560 ft²
1 mi²	2,589,988.110336 m²	640 acres

Every figure is computed locally in your browser — no numbers are uploaded or stored.