How it works
NIST lists the acre as 43,560 ft² (4,046.856 422 4 m² on the international foot, which applies from 2023).
Acres = square feet ÷ 43,560. Square feet = acres × 43,560. Square yards = acres × 4,840. Square meters = acres × 4,046.8564224.
Worked example
10,000 sq ft ÷ 43,560 = 0.2296 acres, which is 1,111 sq yd or 929 m².
| Lot | Sq ft | Acres |
|---|---|---|
| 50 × 100 ft | 5,000 | 0.1148 |
| 100 × 100 ft | 10,000 | 0.2296 |
| 200 × 200 ft | 40,000 | 0.9183 |
| 208.71 × 208.71 ft | 43,560 | 1.0000 |
Tips and common mistakes
- A lot's legal area comes from its deed or survey, not from tape measurements.
- You can enter feet or metres; the calculator converts.
Questions about this calculator
How many square feet are in an acre?
43,560.
What is 10,000 sq ft vs. acres?
0.2296 acres, a little under a quarter acre.
Is 200 ft by 200 ft an acre?
No. 40,000 sq ft is 0.9183 acres. A square acre is about 208.71 ft on each side.
Sources
Values marked with a link come from the linked source, which opens in a new tab. Unit conversions and our own defaults are listed separately. Every value the site uses is in the methodology source register.
Where the numbers come from 3
- Square feet per acre
- 43560 sq ft/acre
- NIST, revised unit conversion factors (international foot, from 2023): "43,560 ft2 = 10 ch2 = 160 rd2" (opens in a new tab)nist.gov
- Square meters per acre
- ≈ 4046.86 m²/acre
- NIST, revised unit conversion factors (international foot, from 2023): "4046.856 422 4 m2" (opens in a new tab)nist.gov
- Meters per international foot
- 0.3048 m/ft
- NIST, international foot conversion (opens in a new tab)nist.gov
Unit conversions and our defaults4
- Square yards per acre
- 4840 sq yd/acre
- Derived: 43,560 sq ft ÷ 9 sq ft per square yard
- Square feet to acres starting value
- 10000 sq ft
- Wave 2 pack worked example; editable starting measurements
- Square feet to acres starting lot
- 200, 200 ft length, ft width
- Wave 2 pack worked example; editable starting measurements
- Volume and weight display precision
- 2 decimal places
- Owner specification: display volume and tons to two decimals
By Taimoor Zayad, DAE in Civil Engineering, three years as a site supervisor.Last updated How we calculate