A plot of land
1 international acre equals 4,046.8564224 square meters, or 0.40468564224 hectare. The displayed value follows your precision setting.
Area Converter
Area factors are squared length factors. One international acre is exactly 43,560 ft².
Converted value
Square meters (m²)
Square meters (m²)
Display rounding does not change the calculation. Scientific notation keeps very small values visible; extra digits do not add measurement accuracy.
| Unit | Equivalent |
|---|---|
| Square meters (m²) | 4046.85642 |
| Square centimeters (cm²) | 40468564.2 |
| Square millimeters (mm²) | 4046856420 |
| Square kilometers (km²) | 0.00404685642 |
| Square feet (ft²) | 43560 |
| Square inches (in²) | 6272640 |
| Square yards (yd²) | 4840 |
| Acres — international | 1 |
| Hectares (ha) | 0.404685642 |
| Square miles (mi²) | 0.0015625 |
Measure a rectangle or circle
For a circle, enter its diameter as the first dimension. The second dimension is used only for rectangles. Geometric area only; no material waste is included.
11.1483648Area (m²)
120Square feet (ft²)
0.00275482094Acres (acre)
All entered measurements and calculations stay in this browser. No external API or uploaded dataset is used.
How to use the Area Converter
- 01
Enter a numeric value without a comma separator or unit suffix, then choose the source and destination units.
- 02
Read the main result and equivalent-unit table. Choose 3, 6, 9, or 12 significant digits for display; calculation constants are not rounded to match the display.
- 03
Use the measure a rectangle or circle panel for the practical calculation. Restore its example independently from the converter.
- 04
Copy the conversion or task results, or download the displayed conversion table as a CSV. Clear removes the converter value.
Examples
A room floor
A 12 by 10 foot rectangle covers 120 square feet, or 11.1483648 square meters. Allow for waste separately when ordering flooring.
Why the factor is squared
A meter is 100 centimeters, so a square meter contains 100 × 100 = 10,000 square centimeters. Applying a length conversion just once gives the wrong area. The table uses squared international-foot and inch definitions.
From dimensions to area
The measurement panel uses length × width for a rectangle and π × (diameter ÷ 2)² for a circle. Dimensions share the selected length unit. Irregular boundaries, slopes, openings, and overlaps require a more detailed measurement.
Precision and accepted input
Use a decimal point or scientific notation such as 1e3. Blank values, unit suffixes, separators, and nonfinite numbers are rejected. Input magnitudes above 1e100 or nonzero magnitudes below 1e-100 are outside the supported range. The table rounds only for presentation, so 12 displayed digits should not be interpreted as 12 digits of measurement accuracy. Binary floating-point calculations can differ from exact decimal arithmetic in the final digits.
What to know
- Uses international acres and international feet; historical survey-based land records may differ.
- Shape calculations are flat geometric areas, not a construction takeoff.
Common questions
Does an acre mean a square with fixed sides?
No. An acre is an area, regardless of shape. The international acre is defined here as 43,560 square international feet.
Are square feet and feet squared the same?
Yes, ft² means a square foot. A 10-foot square has 100 square feet of area, not 10.