Agrimetra

Acres to square feet calculator

2.5 acres is 108,900 square feet — the same parcel is 1.012 hectares, 101.2 ares and 10,117 square metres. One acre is exactly 43,560 square feet, so acres become square feet by multiplying by 43,560 and square feet become acres by dividing. The converter above prints every unit of the same parcel at once, so nothing is lost when a listing in square feet meets a tax roll in acres.

The answer updates as you type — there is no button to press.

e.g. 2.5

Your answer

Converted area43,560 ft²

What you converted
1 ac = 43,560 ft²

Plot sheet

What this means for the field in front of you:

This plot in every unit
4,047 m² · 40.47 a · 0.4047 ha · 43,560 ft² · 1 ac
As the register writes it (ha a ca)
0 ha 40 a 47 ca
Measured by
a typed area

Three fields are kept; saving a fourth replaces the oldest.

How the answer is worked out

Every conversion on this page runs through one number: 1 acre = 4,046.8564224 m², and 1 acre = 43,560 ft². Whatever you type is turned into square metres once, at full precision, and then out again into the unit you asked for — so acres → square feet and square feet → acres are the same arithmetic run in two directions, and neither accumulates a rounding error the other does not.

The units on offer are the ones land is actually described in:

A search engine will happily convert one unit into one other unit. What it will not do is show you the parcel in all of them at once, write it the way a land register writes it, or let you carry it to the next calculation. That is what the sheet under the answer is for: it prints the parcel in every unit, adds the hectares-ares-centiares line, and offers to save it as a named field so the seeding, fertiliser and sprayer pages can work on the same number instead of a re-typed one.

Rounding is presentation only. The copy button gives the unrounded value, which matters when the converted figure goes into a contract, a rent calculation or a spreadsheet that will divide by it again.

A worked example

Every figure below is computed by the calculator above from this case — nothing here is typed in by hand:

Area to convert
2.5
In this unit
ac
Convert to
ft²

Converted area:108,900 ft²

What you converted
2.5 ac = 108,900 ft²
This plot in every unit
10,117 m² · 101.2 a · 1.012 ha · 108,900 ft² · 2.5 ac
As the register writes it (ha a ca)
1 ha 1 a 17 ca

Worked by Agrimetra with the same engine the calculator above runs.

What this means in the United States

County assessors publish residential lots in square feet and farmland in acres, so the same parcel changes unit halfway through a transaction. The acre is defined as 43,560 square feet, and this page prints your plot in acres, square feet, hectares, ares and square metres at once so nothing is lost in the handoff.

Questions growers actually ask

What is the acre to square feet factor?
43,560 square feet to the acre, exactly. It is a survey definition, not a measurement: an acre is 10 square chains and a chain is 66 feet.
How do I go from square feet back to acres?
Divide by 43,560. A 21,800 sq ft lot is 0.5005 acres, which is why a "half-acre lot" in a listing is usually a little over or under a true half acre.
Why does the page show ares and a "ha a ca" line?
Because a parcel often has to be read by someone outside the US. An are is 100 square metres and a hectare is 100 ares, and land registers across Europe and Latin America write a parcel as hectares, ares and centiares in that order. The line is there so a figure can be handed on without being re-converted.
Does this use the international acre?
Yes — 4,046.8564224 square metres, the international acre, which has been the US definition of area since the survey foot was retired at the end of 2022.

Last updated:

Sources

Calculators that use the same field