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Deck Footing Calculator
Estimate the number of footings and concrete volume for a deck.
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Footings needed
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Estimate the number of footings and concrete volume for a deck.
Deck Footing Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Footings = (length/spacing + 1) x (width/spacing + 1).
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
Deck Quick Guide
Typical values for reference.
| Length m | Width m | Spacing m | Footings |
|---|---|---|---|
| 4.8 | 3.6 | 1.8 | 12 footings |
| 3 | 3 | 1.5 | 9 footings |
| 6 | 4 | 2 | 12 footings |
| 8 | 5 | 1.8 | 24 footings |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Deck Footing Calculator FAQ
Answers to common questions about this calculator.
Use the deck area or run length with the coverage or spacing shown.
Yes, 5 to 10 percent.
No, it is an estimate.
Your building control office.