Acres to Square Feet Converter

Convert acres to square feet (ac to sq ft)

To convert acres to square feet, multiply the value in acres by 43,560. It helps when comparing lot sizes, since US land is often listed in acres while houses and small lots are quoted in square feet. This acres to square feet converter works both ways: type acres or square feet into either box above and the other box, the worked formula and the chart below update as you type.

The acre (ac) is a unit of land equal to 43,560 square feet, or exactly 4,046.8564224 m². It began as the area a team of oxen could plough in a day and was later fixed as one furlong by one chain. Acres are used for land and farm sizes in the US, UK, India, Canada and Australia. One acre is 43,560 square feet.

A square foot (sq ft or ft²) is the area of a square one foot on each side — exactly 0.09290304 square meters. Going the other way, one square foot equals 0.0000229568 acres. It is the standard unit for home, office and flooring sizes in the US, and property in India, Canada and the UK is also widely advertised in square feet.

How to convert acres to square feet with this tool

1. Type a number into the Acres (ac) box — it starts at 0.25 ac as an example.
2. Read the answer in the Square feet (sq ft) box and in the result panel, which also shows the formula with your number.
3. To go the other way, type into the square feet box, or press the swap button to open the Square Feet to Acres converter with your value carried over.
4. Choose how many decimal places you want, or tap a quick value such as 0.1 ac, 0.25 ac, 0.5 ac.
5. Press Copy result to paste the conversion into a message, spreadsheet or note.

Acres to Square Feet converter features

Acres to Square Feet formula

The formula is sq ft = ac × 43,560. It is exact because an acre is defined as exactly 43,560 square feet.

The reverse formula is ac = sq ft ÷ 43,560 — or use the Square Feet to Acres converter. Three worked examples:

• A quarter-acre lot: 0.25 ac × 43,560 = 10,890 sq ft
• One acre: 1 ac × 43,560 = 43,560 sq ft
• A tenth of an acre: 0.1 ac × 43,560 = 4,356 sq ft

Acres to Square Feet quick reference

The values people look up most often, worked out with the exact factor:

• 1 ac = 43,560 sq ft
• 1 sq ft = 0.0000229568 ac
• 0.1 ac = 4,356 sq ft
• 0.25 ac = 10,890 sq ft
• 0.5 ac = 21,780 sq ft
• 2 ac = 87,120 sq ft

Quick tip: Remember 43,560: a quarter acre is 10,890 sq ft and half an acre is 21,780 sq ft, while 0.75 ac = 32,670 sq ft completes the set.

Related conversions: Square Meters to Square Feet, Acres to Hectares and the full area converter.

Acres to Square Feet conversion table

Values in square feet are rounded to 2 decimal places (more for very small numbers). For any value not listed, type it into the converter above.