Area

Acres to Square Feet Converter

Convert acres and square feet both ways. 1 acre = 43,560 sq ft, with square metres and hectares shown too.

How to convert acres to square feet

One acre is defined as exactly 43,560 square feet, so converting between the two is a single multiplication or division. To go from acres to square feet, multiply by 43,560; to go the other way, divide by 43,560. For example, half an acre is 0.5 × 43,560 = 21,780 sq ft, and a 10,000 sq ft plot is 10,000 ÷ 43,560 ≈ 0.2296 acres. Type into either field above and the other updates instantly, with square metres and hectares shown alongside.

The acre traces back to the area a yoke of oxen could plough in a day — historically one chain (66 ft) by one furlong (660 ft), which is exactly 43,560 square feet. That irregular shape is why the number isn't round, but the modern definition is fixed and exact.

Acres to square feet conversion table

Acres	Square feet
0.25 ac	10,890 sq ft
0.5 ac	21,780 sq ft
1 ac	43,560 sq ft
2 ac	87,120 sq ft
5 ac	217,800 sq ft
10 ac	435,600 sq ft
40 ac	1,742,400 sq ft
100 ac	4,356,000 sq ft

Acres, square metres and hectares

If you work in metric units, it helps to know that 1 acre equals about 4,046.86 m² and 0.404686 hectares — so roughly 2.47 acres make one hectare. These metric equivalents update live above, which is handy when a listing quotes land in acres but local records use square metres or hectares. Because the conversion factors are exact constants, the results are precise rather than approximate.

Where 43,560 comes from

The number looks arbitrary because it is a fossil of medieval farming rather than anything designed. An acre was originally the area a man with a team of oxen could plough in a day, and it was measured as a long thin strip — one furlong by one chain.

A furlong ("furrow long") is 660 feet, the distance the team could work before needing a rest and a turn. A chain is 66 feet, the length of the surveyor's chain used to lay out fields. Multiply them and you get 660 × 66 = 43,560 square feet. The long thin shape mattered because turning a plough team was slow, so fields were laid out to minimise turns.

That same chain still shapes things you see today: a cricket pitch is one chain, and the distance between bases on a baseball diamond is 90 feet, close to 1.36 chains. The acre survived because land records are conservative — redrawing every deed is a far bigger job than tolerating an awkward number.

Getting a feel for an acre

Because the acre has no fixed shape, it is hard to picture. A few reliable comparisons:

A US football field without the end zones is 48,000 ft² — just over 1.1 acres. Including the end zones it is about 1.32 acres. "Roughly a football field" is the most useful mental anchor.
A square acre is about 209 feet on each side — around 70 paces.
A soccer pitch is typically 1.6–1.9 acres.
A typical US suburban lot is a quarter-acre, around 10,890 ft².

Acres, hectares and square metres

Most of the world records land in hectares, and the two units are easy to confuse because neither is intuitive. A hectare is a genuinely tidy unit — it is exactly 100 × 100 metres, or 10,000 m² — which is one of the clearer arguments for the metric system, since nobody has to remember 43,560 to work with it.

One acre is 0.404686 hectares, so 1 hectare is about 2.47 acres. For rough conversions in your head, multiply hectares by 2.5, or divide acres by 2.5. On a 40-acre parcel that shortcut gives 16 hectares against a true 16.19 — close enough to sanity-check a listing, though not to sign a contract on.

Frequently asked questions

How many square feet are in an acre?

Exactly 43,560 square feet. This is a fixed definition, so 1 acre always equals 43,560 sq ft.

How do I convert square feet back to acres?

Divide the number of square feet by 43,560. For example, 21,780 sq ft ÷ 43,560 = 0.5 acres. Just type into the Square feet box above and the acre value fills in automatically.

How big is an acre in square metres and hectares?

One acre is about 4,046.86 square metres, or 0.404686 hectares. Roughly 2.47 acres make up one hectare.

Why is an acre 43,560 square feet and not a round number?

The acre originally measured one chain (66 ft) by one furlong (660 ft) of ploughed land, which works out to exactly 43,560 square feet. The odd-looking figure comes from those old units.

How big is an acre compared to a football field?

A US football field without the end zones is 48,000 sq ft — just over 1.1 acres. With the end zones it's about 1.32 acres, so 'roughly a football field' is a fair anchor.

What shape is an acre?

Any shape — an acre is a measure of area, not of dimensions. If it were a perfect square each side would be about 209 feet. Historically it was a long thin strip, one furlong by one chain, to reduce how often a plough team had to turn.