Before you use the result
Almost every paving, sealcoating, striping, and crack-sealing estimate starts with one number: the actual square footage of pavement. This calculator lets you add multiple rectangles — the main lot, drive aisles, an apron — and subtract the pieces that aren't paved, like landscape islands, planters, and building footprints.
Measure to the edge of pavement, not the property line, and break irregular shapes into rectangles you can add together. The total feeds directly into the asphalt tonnage, sealcoat, striping, and crack-seal calculators.
Transparent assumptions
How this calculator works
Each area is length × width. Add a row for every paved rectangle. For odd shapes, split them into rectangles and add each one.
Subtract what isn't pavement. Flag islands, landscaping, and buildings as 'subtract' so they come out of the total instead of adding to it.
Automatic conversions. The running total is shown in square feet, square yards (÷ 9), and acres (÷ 43,560) so you can hand the right unit to a supplier or contractor.
Formula used
- Area of a rectangle = Length (ft) × Width (ft)
- Total ft² = Sum of added areas − Sum of subtracted areas
- Square yards = ft² ÷ 9 | Acres = ft² ÷ 43,560
Quick reference
Square footage conversions
Quick conversions between the units suppliers and contractors use.
| Square feet | Square yards | Acres |
|---|---|---|
| 1,000 ft² | 111 yd² | 0.023 ac |
| 5,000 ft² | 556 yd² | 0.115 ac |
| 10,000 ft² | 1,111 yd² | 0.230 ac |
| 43,560 ft² | 4,840 yd² | 1.000 ac |
| 100,000 ft² | 11,111 yd² | 2.296 ac |
Frequently asked questions
How do I calculate the square footage of a parking lot?
Break the lot into rectangles, multiply each one's length by its width to get its area in square feet, and add them together. Then subtract any areas that aren't paved — landscape islands, planters, and building footprints. Measure to the edge of pavement, not the property line.
How many square feet are in an acre?
One acre is 43,560 square feet. To convert a lot's square footage to acres, divide by 43,560. For example, a 100,000 square foot lot is about 2.3 acres.
How do I convert square feet to square yards?
Divide square feet by 9. Paving and concrete are often quoted per square yard, so a 9,000 square foot lot is 1,000 square yards.
Should I include landscaping and islands in the total?
No — subtract them. You only pay to pave, seal, or stripe actual pavement, so landscape islands, planters, and building footprints should be taken out of the total. This calculator lets you flag those areas to subtract them automatically.
How accurate does my measurement need to be?
For planning and comparing bids, measuring each rectangle to the nearest foot is fine. For a contract, the contractor will verify dimensions on site — small measurement differences change tonnage and material quantities, so the final number should come from their takeoff.
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