Square Feet to Acres Calculator
Convert square feet to acres instantly. Enter any area in square feet below and get the acreage right away, plus hectares and square meters. There are 43,560 square feet in one acre — this converter handles the division for you, in both directions.
Square Feet ↔ Acreage Converter
Editing either field updates the other automatically. 43,560 ft² = 1 acre.
How to Convert Square Feet to Acres
The conversion is a simple division:
Acres = Square feet ÷ 43,560
To convert square feet to acres, divide the number of square feet by 43,560. For example, 87,120 ft² ÷ 43,560 = 2 acres.
To go the other way (acres to square feet), multiply by 43,560 instead. See our dedicated acres to square feet calculator.
Square Feet to Acres Conversion Table
| Square Feet | Acres |
|---|---|
| 1,000 ft² | 0.023 acre |
| 5,000 ft² | 0.115 acre |
| 10,000 ft² | 0.230 acre |
| 21,780 ft² | 0.5 acre |
| 43,560 ft² | 1 acre |
| 50,000 ft² | 1.148 acres |
| 87,120 ft² | 2 acres |
| 100,000 ft² | 2.296 acres |
| 217,800 ft² | 5 acres |
| 435,600 ft² | 10 acres |
Why 43,560 Square Feet?
One acre is defined as exactly 43,560 square feet. This comes from the historical definition of an acre as one chain (66 feet) by one furlong (660 feet): 66 × 660 = 43,560. That’s why the number looks arbitrary but is actually fixed and exact.
| Common lot size | In acres |
|---|---|
| 5,000 ft² | 0.11 acre |
| 7,500 ft² | 0.17 acre |
| 10,890 ft² | 0.25 acre (quarter acre) |
| 21,780 ft² | 0.5 acre (half acre) |
| 43,560 ft² | 1 acre |
Measure Square Footage on a Map
If you don’t already have the square footage, you can measure it directly from satellite imagery with the acreage calculator map. Trace the boundary of any lot or field and read both the square footage and acreage instantly — no manual conversion required.
Frequently Asked Questions
How many square feet are in an acre?
There are exactly 43,560 square feet in one acre.
How do I convert square feet to acres?
Divide the number of square feet by 43,560. For example, 21,780 ÷ 43,560 = 0.5 acres.
How many acres is 10,000 square feet?
10,000 square feet is about 0.2296 acres, or just under a quarter acre.
How many acres is a 100 x 100 ft lot?
A 100 ft by 100 ft lot is 10,000 square feet, which is about 0.2296 acres.
Do I need to sign up to use this calculator?
No. This converter works instantly in your browser with no sign-up. To measure land on a map, download the Marea app on iOS and Android.
Try Marea Today
Download Marea on iOS or Android and start measuring in seconds.
