Follow the default numbers.
With square feet of 43,560 sq ft, the model gives land area: 1 acres.
The formula is 1 acre = 43,560 square feet. Open the breakdown to trace expenses and assumptions. Change one input at a time to see how your decision changes. This example uses scenario inputs; it is not an offer, tax bill, appraisal or legal determination.
The conversion factor is fixed
One acre is 43,560 square feet. Divide square feet by that number to obtain acres, or multiply acres by it to obtain square feet. One international acre is also 4,046.8564224 square meters. The conversion does not depend on state, land use or parcel shape.
Reported area can use a different basis
A deed may reference survey units or historical measurements that need careful interpretation. This tool uses international feet and modern international acres. A recorded lot area can include land you cannot build on, and a home’s living area is different from parcel area. Keep the unit and measurement purpose visible when comparing listings.
Examples for a land comparison
Half an acre is 21,780 square feet. A quarter acre is 10,890 square feet. A square acre has a side a little over 208.7 feet; that dimension follows from the square root of area and does not describe every one-acre parcel. Open the lot-size tool when you know the dimensions rather than the area.
Keep your assumptions with the result
Save the calculation to your deal file to reuse compatible inputs in another tool. The file stays in this browser on this device. Download the CSV to open the complete inputs, results and schedule in Excel or Google Sheets. Use PDF to print the report or save it as a PDF. A share link includes entered financial figures in its URL, so use it only with people you intend to share those numbers with.