Sqft to Acres Calculator
Convert between square feet, acres, hectares and traditional land units. Swap the direction with one click.
To convert square feet to acres, divide by 43,560. A 10,000 sq ft lot is 10,000 ÷ 43,560 = 0.2296 acres. Going the other way, multiply acres by 43,560 — half an acre is 21,780 square feet.
One acre = 43,560 sq ft exactly. One hectare = 10,000 m² = 107,639 sq ft. One cent = 1/100 acre = 435.6 sq ft. One guntha = 1/40 acre = 1,089 sq ft.
Why an acre is 43,560 square feet
The number looks arbitrary but comes from medieval English farming. An acre was defined as one chain by one furlong — the area a team of oxen could plough in a day.
A chain is 66 feet and a furlong is 660 feet, so an acre is 66 × 660 = 43,560 square feet. The figure is exact, not rounded.
For a quick mental check: an acre is roughly 208.7 ft × 208.7 ft, or a little smaller than an American football field without the end zones.
Typical lot sizes in acres
Residential lots are usually quoted in square feet up to about half an acre, and in acres above that. Some useful reference points:
- Quarter acre = 10,890 sq ft — a common suburban lot
- Third acre = 14,520 sq ft
- Half acre = 21,780 sq ft
- One acre = 43,560 sq ft
If you only know the lot's dimensions, multiply length by width first, then divide by 43,560. A 100 ft × 150 ft lot is 15,000 sq ft, which is 0.344 acres.
Cents, gunthas and other land units
Land in parts of South Asia is measured in units derived from the acre, and this calculator handles the common ones:
- Cent — 1/100 acre = 435.6 sq ft. Widely used in Tamil Nadu, Kerala and Andhra Pradesh.
- Guntha — 1/40 acre = 1,089 sq ft. Common in Maharashtra and Karnataka.
- Ankanam — 72 sq ft.
- Gajam — 9 sq ft, identical to a square yard.
Square feet to acres conversion table
| Square feet | Acres | Hectares |
|---|---|---|
| 1,000 sq ft | 0.0230 | 0.0093 |
| 5,000 sq ft | 0.1148 | 0.0465 |
| 10,000 sq ft | 0.2296 | 0.0929 |
| 10,890 sq ft | 0.2500 | 0.1012 |
| 21,780 sq ft | 0.5000 | 0.2023 |
| 43,560 sq ft | 1.0000 | 0.4047 |
| 87,120 sq ft | 2.0000 | 0.8094 |
| 217,800 sq ft | 5.0000 | 2.0234 |
Frequently asked questions
How many square feet are in an acre?
One acre is exactly 43,560 square feet. The figure comes from one chain (66 ft) multiplied by one furlong (660 ft).
How do I convert sqft to acres?
Divide the square footage by 43,560. A 15,000 square foot lot is 15,000 ÷ 43,560 = 0.344 acres.
How big is a quarter acre in square feet?
A quarter acre is 10,890 square feet — for example a lot measuring roughly 104 ft by 104 ft.
How many acres is 10,000 square feet?
10,000 square feet is 0.2296 acres, or just under a quarter of an acre.
What is the difference between an acre and a hectare?
A hectare is the metric equivalent, defined as 10,000 square meters or 107,639 square feet. One hectare equals about 2.471 acres, so a hectare is roughly two and a half acres.