Convert square feet to acres
1 ft² = 2.29568e-5 ac · 1 ac = 43560 ft² · Exact by definition
1 ft² = 2.29568e-5 ac
The same value in other units
- square centimetre
- 929.03 cm²
- square metre
- 0.092903 m²
- hectare
- 9.2903e-6 ha
- square kilometre
- 9.2903e-8 km²
Settings
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Area
square feet to acres: conversion table
| square foot | acre |
|---|---|
| 1 ft² | 2.29568e-5 ac |
| 2 ft² | 4.59137e-5 ac |
| 3 ft² | 6.88705e-5 ac |
| 5 ft² | 0.000114784 ac |
| 10 ft² | 0.000229568 ac |
| 20 ft² | 0.000459137 ac |
| 25 ft² | 0.000573921 ac |
| 50 ft² | 0.00114784 ac |
| 100 ft² | 0.00229568 ac |
| 250 ft² | 0.00573921 ac |
| 500 ft² | 0.0114784 ac |
| 1000 ft² | 0.0229568 ac |
| acre | square foot |
|---|---|
| 1 ac | 43560 ft² |
| 2 ac | 87120 ft² |
| 3 ac | 130680 ft² |
| 5 ac | 217800 ft² |
| 10 ac | 435600 ft² |
| 20 ac | 871200 ft² |
| 25 ac | 1089000 ft² |
| 50 ac | 2178000 ft² |
| 100 ac | 4356000 ft² |
| 250 ac | 10890000 ft² |
| 500 ac | 21780000 ft² |
| 1000 ac | 43560000 ft² |
How the conversion works
ac = ft² × 2.2956841e-5
Both units are defined exactly, so the precision of the square feet to acres result depends only on the number of decimal places you choose.
METHOD AND SOURCES
Where the conversion factors come from
Results are calculated from the unit definitions stored in the converter, not copied from a lookup table. For exact units, every value in the table follows from the same factor shown in the formula above.
- BIPM — SI Brochure
The official definitions of the International System of Units (SI).
- NIST SP 811 — Conversion factors
Conversion-factor tables for SI and non-SI units.
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