Convert m², ft², ac, ha, km² and more — metric, imperial and land units.
Updated
| Unit | Value | Copy |
|---|---|---|
Square millimetre mm² | 1,000,000 | |
Square centimetre cm² | 10,000 | |
Square metre m² | 1 | |
Hectare ha | 0.0001 | |
Square kilometre km² | 1.000000e-6 | |
Square inch in² | 1,550.00310001 | |
Square foot ft² | 10.76391042 | |
Square yard yd² | 1.19599005 | |
Acre ac | 0.00024711 | |
Square mile mi² | 3.861022e-7 |
Quick start
Type a value, pick the source unit, copy the result from any row.
Enter the area and pick its unit. Switching units converts the displayed value so the meaning is preserved.
All ten units — mm², cm², m², ha, km², in², ft², yd², ac, mi² — update live. The source unit is highlighted.
Click Copy on any row to grab the converted value. Everything runs locally — no upload.
In-depth guide
Convert between ten common area units — from square millimetres to square miles, plus hectares and acres for land area — in a single table. Type a value, pick the source unit, every other unit updates live.
| Unit | Symbol | In square metres |
|---|---|---|
| Square millimetre | mm² | 0.000 001 |
| Square centimetre | cm² | 0.000 1 |
| Square metre | m² | 1 |
| Hectare | ha | 10 000 |
| Square kilometre | km² | 1 000 000 |
| Square inch | in² | 0.000 645 16 |
| Square foot | ft² | 0.092 903 04 |
| Square yard | yd² | 0.836 127 36 |
| Acre | ac | 4 046.856 422 4 |
| Square mile | mi² | 2 589 988.110 336 |
When to reach for it. Use it for floor plans, land, gardening and material estimates across metric and imperial area units.
When something else is better. Property and legal land measurement should use the locally recognised unit and an official survey.
The pitfall to watch. Area scales with the square of length, so doubling a side quadruples the area — a frequent estimation error.
Everything runs on your device. The values you enter are processed locally in this browser tab — EpitomeTool does not send your input to a server, store it, or log it. That means you can use the tool offline once the page has loaded, and refreshing the tab wipes the slate.
International yard and pound agreement (1959), squared. 1 in² = 6.4516 cm² exactly, 1 ft² = 929.0304 cm², 1 yd² = 0.83612736 m², 1 mi² = 2 589 988.110336 m². The acre is defined as 1/640 of a square mile = 4046.8564224 m² exactly.
A hectare is metric: exactly 10 000 m² (a square 100 m on each side). An acre is imperial: 4046.86 m², historically the area one ox could plough in a day. 1 hectare ≈ 2.471 acres.
It is — exactly. The 'in metres' column on the length converter shows linear ratios; here we show squared ratios. The factor between cm² and m² is 0.0001, not 0.01, because both dimensions scale.
It covers mm², cm², m², ha (10⁴ m²) and km² (10⁶ m²). dm² (0.01 m²) and decametre² (100 m²) are uncommon outside textbooks; if you need them, multiply manually.
Yes for engineering purposes. Real-estate quotes often round to whole units (a 1200 ft² apartment is rarely 1200.0 ft² on the survey). Use the converter to translate magnitudes, but cite the original measurement when it matters legally.
Yes. Everything runs in your browser. No request leaves the page during conversion.
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