What this calculator does
Deck footing count works out number of footings for a deck frame at a chosen maximum footing spacing. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaFootings = (⌈deck length / spacing⌉ + 1) × (⌈deck width / spacing⌉ + 1), a grid at the maximum spacing
The inputs explained
| Field | What to enter |
|---|---|
| Deck length (m) | A number, measured in m. Starts at 6. |
| Deck width (m) | A number, measured in m. Starts at 4. |
| Maximum footing spacing (m) | A number, measured in m. Starts at 2.4. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with deck length
Every other input is held at the calculator’s starting values while deck length varies. Select any row to load that scenario into the calculator.