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Square feet to acres calculator

Convert between square feet, acres, square yards, square meters and hectares, or work out the acreage of a lot from its measurements.

Units
What do you have?

Commas are fine: 10,000.

One acre is 43,560 square feet. One hectare is 10,000 square meters, about 2.47 acres.

Converted area

0.2296 acres

10,000 square feet

Hectares
0.0929
Square feet
10,000
Square yards
1,111
Square meters
929
A square plot this size
100 ft a side
How it's calculated
  1. 10,000 sq ft
  2. 10,000 sq ft ÷ 43,560 sq ft per acre = 0.2296 acres
  3. 10,000 sq ft × 0.09290304 = 929 m²; ÷ 10,000 = 0.0929 hectares

Estimates use manufacturer data sheets and industry guides (sources). Check local codes and your supplier's figures before you order.

How to use the acreage calculator

  1. Pick An area to convert if you already know the area, or A lot's measurements to start from its sides.
  2. Type the area and choose its unit, or enter the lot's length and width. Triangles and circles work too.
  3. Read the acres at the top, and the same area in square feet, square yards, square meters and hectares below.
  4. Open How it's calculated to see the division by 43,560 with your numbers.

How to convert square feet to acres

An acre is 43,560 square feet, so the conversion is one division:

Acres = square feet ÷ 43,560

Example: a lot 100 ft wide and 200 ft deep is 100 × 200 = 20,000 sq ft. 20,000 ÷ 43,560 = 0.4591 acres, a little less than half an acre. In metric that’s 20,000 × 0.09290304 = 1,858 m², or 0.1858 hectares.

To go the other way, multiply acres by 43,560: 2.5 acres is 108,900 sq ft.

Area conversions

1 unit Square feet Acres
Square yard 9 0.000207
Square meter 10.764 0.000247
Acre 43,560 1
Hectare 107,639 2.471
Square mile 27,878,400 640

The foot is exactly 0.3048 m, so a square foot is exactly 0.09290304 m², and a hectare is 10,000 m². These are the definitions in NIST Handbook 44.

How big is an acre?

An acre can be any shape. If it were square, these would be the sides:

Area Square feet Side of a square
1/4 acre 10,890 104.4 ft
1/2 acre 21,780 147.6 ft
1 acre 43,560 208.7 ft
2 acres 87,120 295.2 ft
5 acres 217,800 466.7 ft
10 acres 435,600 660 ft

Measuring a lot

If you have a survey or plat, use the area printed on it. If you measure the lot yourself, split it into rectangles and triangles, work out each piece in the square footage calculator, add them up and divide by 43,560. A triangle’s area is half its base times its height, measured at right angles to the base.

Questions and answers

How many square feet are in an acre?

43,560. That's the definition NIST publishes in Handbook 44: one acre is 43,560 square feet, or 160 square rods. It's also 4,840 square yards and about 4,047 square meters.

How do I convert square feet to acres?

Divide the square feet by 43,560. A 10,000 sq ft lot is 10,000 ÷ 43,560 = 0.2296 acres, a little under a quarter acre, and 21,780 sq ft is exactly half an acre.

How do I find the acreage of a lot?

Multiply the length by the width in feet, then divide by 43,560. A lot 100 ft wide and 200 ft deep is 20,000 sq ft, or 0.4591 acres. For an odd-shaped lot, split it into rectangles and triangles, or use the area on your deed or survey.

How long is each side of an acre?

An acre has no set shape. As a square it's about 208.7 ft on each side. A strip one chain wide (66 ft) and one furlong long (660 ft) is also exactly one acre, since NIST defines the acre as 10 square chains.

How many acres are in a hectare?

About 2.471 acres. A hectare is 10,000 square meters, and NIST defines an acre as exactly 0.40468564224 hectare.

Did retiring the US survey foot change the acre?

Not by any amount you would notice. The acre used to be defined with the US survey foot, which NIST retired at the start of 2023 in favor of the international foot of exactly 0.3048 m. The two feet differ by about 2 parts per million.

Is 200 ft by 200 ft an acre?

No. 200 × 200 = 40,000 sq ft, about 0.92 acres. A square acre is about 208.7 ft on each side, so 210 × 210 ft (44,100 sq ft) is just over an acre.

How many square feet are in half an acre or a quarter acre?

Half an acre is 21,780 sq ft and a quarter acre is 10,890 sq ft, since a full acre is 43,560 sq ft.

Sources

Figures checked October 2026.