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Wood Lap Siding Calculator
Estimate lap siding boards for a wall area from exposed board width and waste.
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Estimate lap siding boards for a wall area from exposed board width and waste.
Wood Lap Siding Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Boards = area / (exposed width x board length) x (1 + waste).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Wood Quick Guide
Typical values for reference.
| Area m2 | Exposure mm | Length m | Boards |
|---|---|---|---|
| 20 | 140 | 3.6 | 44 boards |
| 60 | 140 | 3.6 | 131 boards |
| 120 | 150 | 3.6 | 245 boards |
| 250 | 180 | 3.6 | 425 boards |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Wood Lap Siding Calculator FAQ
Answers to common questions about this calculator.
The visible width of each board after overlap.
About 10 percent for cuts.
Boards = area / (exposed width x board length) x (1 + waste).
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.