Area Converter
Convert acres, hectares, square feet, square meters, and more instantly.
What it does
Area conversion multiplies by a fixed factor between unit squares. The square meter anchors the metric side, while the international foot of exactly 0.3048 m anchors the imperial side, so every square factor follows from those definitions.
The tool above moves between nine units: square centimeters, meters, kilometers, hectares, square inches, feet, yards, acres, and square miles. Pick both ends, enter the value, and the answer updates with all nine equivalents below it.
Land listings mix systems by habit: US deeds favor acres and square feet, while most of the world quotes hectares and square meters. One acre is 43,560 ft² or 4046.8564224 m², and one hectare is 10,000 m² or about 2.471 acres.
NIST publishes the SI length base and BIPM maintains the international system that fixes the inch at 2.54 cm. Square factors below come straight from those line standards, not from rounded memory.
How to use
- Enter the area value in the source unit.
- Pick the source unit on the left and the target on the right.
- Read the converted line first.
- Scan the all units note for the remaining seven equivalents.
- Round only the final figure when copying into deeds or ads.
Formula
- 4046.8564224
- Square meters in one acre, exact from 43,560 ft².
- 0.09290304
- Square meters in one ft² (0.3048 squared).
- hub
- Square meters as the single middle step for all pairs.
Length factors square into area factors, so small rounding in a side grows in the square. Going through square meters keeps one path for all 72 pairs instead of memorizing each ratio.
Worked example
Example: 1 acre to square meters
Value 1, from acres, to square meters.
- Factor for acres: 4046.8564224 m² each.
- Multiply: 1 x 4046.8564224 = 4046.8564224 m².
- Round to four places: 4046.8564 m².
- Result: 1 acre = 4046.8564 m².
- Cross check: 4046.8564 / 4046.8564224 = 1.00000 acres back.
Reference table
| Pair | Factor | Everyday check |
|---|---|---|
| 1 acre to m² | 4046.8564 | American football field is about 1.32 acres |
| 1 ha to acres | 2.4711 | 100 x 100 m plot is 2.4711 acres |
| 1 ft² to m² | 0.09290304 | 10 ft² is 0.9290 m² |
| 1 mi² to km² | 2.58999 | One square mile is 640 acres |
| 1 m² to ft² | 10.7639 | 20 m² flat room is 215.28 ft² |
Limits
- Flat area only. Slopes and uneven ground need survey adjustment.
- Survey feet on old US records differ slightly from international feet.
- Listings round; legal deeds keep full precision.
- Irregular plots need splitting into rectangles or a planimeter.
Common mistakes
- Using the length factor (0.3048) for area instead of its square.
- Reading acres as square miles: one mile square holds 640 acres.
- Rounding mid chain across several conversions.
- Mixing US survey acres with international values on old deeds.
- Trusting rounded 4047 for legal area instead of 4046.8564224.
Try it yourself
Quick checks. Answers sit tucked under each question.
10 acres in hectares?
10 x 0.404686 = 4.0469 ha.
100 m² in ft²?
100 x 10.7639 = 1076.39 ft².
Half an acre in m²?
0.5 x 4046.8564 = 2023.4282 m².
Questions
How many m² are in an acre?
4046.8564 m². The exact path is 43,560 ft² times 0.09290304.
Acres or hectares?
US land uses acres, most of the world uses hectares. One hectare is 2.4711 acres.
How many ft² in a m²?
About 10.7639 ft². Divide or multiply through square meters for the rest.
What is 640 acres?
One square mile, which is about 2.59 km².
Why square the factor?
Area multiplies two sides, so each side conversion applies twice.
Which unit for a flat?
Square meters or feet for rooms, acres or hectares for land.