Acre Calculator
An acre is 43,560 square feet. Enter the length and width of a rectangle, such as a field, lot or pasture, and this shows its size in acres and square feet.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Multiply the length by the width to get the area. Both sides must be in the same unit, and the calculator converts for you.
For an irregular piece, split it into rectangles and triangles, work out each one, and add them together.
Worked example
A plot 660 ft long and 330 ft wide covers 5 ac, which is 217,800 ft² of ground.
Questions
Is an acre always the same size?
Yes. An acre is 43,560 square feet, or about 4,047 square meters. US deeds and land listings use this same measure.
What if my field is not a rectangle?
Break it into rectangles or triangles, find the area of each, and add them. A map tool that traces an outline also works.
Can I enter hectares instead?
Yes. Switch to metric and the lengths turn into meters. One hectare is 10,000 square meters, which is about 2.5 acres.
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