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Total Siding Needed (with 10% waste)
1,373 sq ft
13.7 squares
Gross Wall Area
1,440 sq ft
Window/Door Deduction
-192 sq ft
Net Siding Area
1,248 sq ft
Waste Allowance (10%)
+125 sq ft
Vinyl Siding (2 sq/carton): 7 cartons
Fiber Cement (approx.): 58 boxes (8"×144" planks)
* This calculator provides estimates. Actual material needs depend on siding style, reveal, and waste from cutting. Complex homes with many corners need 15-20% waste factor.
Whether you're getting quotes from contractors or planning a DIY project, knowing how much siding you actually need is essential. Too little means project delays; too much means wasted money.
Calculating siding isn't as simple as measuring your walls. You need to account for windows, doors, gables, and waste from cutting. Most homeowners are surprised by how much the deductions from openings affect the total—and equally surprised by how much waste factor matters.
Our calculator helps you determine accurate square footage, so you can order the right amount of material or verify that a contractor's estimate makes sense.
Proper siding calculation involves several steps:
Running short means waiting for more material while your house sits partially finished—and potentially exposed to weather.
Over-ordering 20% instead of 10% on a 2,000 sq ft project means paying for 200 extra square feet you don't need.
If a contractor's square footage is way off from your calculation, ask why. It might be legitimate complexity factors—or padding.
Knowing your square footage lets you quickly compare costs across different siding materials.
Mistake: Forgetting to account for gables
Solution: Gable ends can add 10-20% to your total square footage. Always include them in calculations.
Mistake: Using interior measurements
Solution: Exterior walls are larger than interior room dimensions. Measure outside, or add about 6-8 inches per wall for wall thickness.
Mistake: Skipping the waste factor
Solution: You will have waste from cutting, fitting around openings, and damaged pieces. 10% is minimum; 15% is safer for complex homes.
Mistake: Measuring only one wall and multiplying
Solution: Few homes are perfectly rectangular. Measure each wall separately for accuracy.
While DIY measurement works for simple homes, consider professional measurement when:
Divide by 100. If you have 2,000 square feet of siding, that's 20 squares. Most vinyl siding cartons cover 2 squares (200 sq ft) each.
10% is standard for rectangular homes with few openings. Use 15% for homes with many windows, complex corners, or gables. Use 20% for very complex architecture.
Yes, but use average sizes if you don't have exact measurements. A typical window is about 15 sq ft (3×5), and a door is about 21 sq ft (3×7).
Yes. Soffit (under eaves) and fascia (facing boards) are typically different materials and measurements. They're not included in wall square footage.
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