Lot Area Calculator

Calculate residential or commercial lot area from frontage, depth, length, width, or known area. Estimate square feet, acres, buildable area, setbacks, lot coverage, perimeter, fence length, land value, and tax.

Calculate Lot Area

Lot Area = Frontage × Depth. Acres = Square Feet ÷ 43,560.
Your result will appear here.

How the lot area calculator works

Frontage and depth mode:
The calculator multiplies lot frontage by lot depth to estimate square footage, acres, perimeter, buildable area, and lot coverage.

Length and width mode:
The calculator multiplies lot length by lot width, which works well for simple rectangular lots.

Multiple lots mode:
The calculator multiplies one lot area by the number of same-size lots.

Known area mode:
The calculator starts from a known lot area and converts it into square feet, acres, hectares, and other useful values.

Why use a lot area calculator?

A lot area calculator helps estimate residential lot size, commercial lot size, property area, subdivision lots, vacant lots, buildable area, setbacks, lot coverage, and fencing length.

It can help calculate square feet, acres, hectares, square yards, square meters, perimeter, fence length, buildable area, lot coverage, lot value, and estimated annual tax.

What your result means

Your result shows gross lot area, excluded area, net lot area, acres, hectares, buildable area after setbacks, lot coverage, allowed building footprint, remaining coverage allowance, perimeter, fence length, lot value, fence estimate, and annual tax estimate.

Lot area formulas

Frequently asked questions

How do I calculate lot area?

For a rectangular lot, multiply the frontage or width by the depth. For example, an 80 foot by 125 foot lot has 10,000 square feet.

How do I convert lot square feet to acres?

Divide lot square feet by 43,560. For example, a 10,000 square foot lot is about 0.2296 acres.

What is buildable lot area?

Buildable lot area is an estimate of the area left after required setbacks are removed from the lot dimensions.

What is lot coverage?

Lot coverage is the building footprint divided by the total lot area, usually shown as a percentage.

Is this lot calculator exact?

No. It is an estimate. Actual lot size and buildable area can vary by survey boundaries, irregular lot lines, easements, zoning rules, setbacks, slopes, utilities, and recorded parcel data.