Siding Calculator
Estimate siding squares and boxes for any exterior wall.
Use this siding calculator to estimate the siding squares and boxes needed for any exterior wall. Calculate the gross wall area, subtract doors and windows, and add 10% for cut waste. One siding square equals 100 ft²; box coverage varies by material, with vinyl siding boxes typically covering 200 ft².
Siding area
1,155
ft² with waste
Squares
11.6
100 ft² each
Boxes
6
200 ft²/box
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Recommended tools & materials
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Brad Nailer
Invisible fastening for trim
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How does the siding calculator work?
Siding area = gross wall area − doors and windows. Add 10% for cut waste. A "square" is 100 ft². Boxes typically cover 200 ft² for vinyl and less for fiber cement.
What else do people ask about this calculator?
How many boxes of vinyl siding do I need?
One box = 2 squares (200 ft²). A 1,200 ft² wall (net) needs 6 boxes plus 10% waste = 7 boxes.
How much extra siding should I order?
10% for straight gable walls; 15% for cut-up walls with dormers or many openings.
Which related calculators should I use next?
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