Calculating your roofing squares is straightforward once you know the Roofing formula and what each input means. This guide explains the method in plain language, walks through a manual calculation, and gives worked examples you can follow — then you can do it instantly with the Roofing Calculator.
What is Roofing?
The Roofing calculation tells you your roofing squares from a few simple inputs. The figure you are solving for here is the roofing squares.
The Roofing formula
The core formula is:
Roofing squares = Total roof area ÷ 100Here is what each input means:
- Total roof area — a value measured in sq ft. Example: 2,000 sq ft.
How to calculate it step by step
- Write down the total roof area (for example, 2,000 sq ft).
- Apply the formula above to get your roofing squares.
- Double-check the result with the Roofing Calculator.
Worked examples
Example 1
| Input / Output | Value |
|---|---|
| Total roof area | 2,000 sq ft |
| Roofing squares | 20.00 |
| Shingle bundles (3 per square) | 60 |
With total roof area of 2,000 sq ft, the roofing squares works out to 20.00.
Example 2
With total roof area of 4,000 sq ft, the roofing squares works out to 40.00.
| Result | Value |
|---|---|
| Roofing squares | 40.00 |
| Shingle bundles (3 per square) | 120 |
Example 3
With total roof area of 1,000 sq ft, the roofing squares works out to 10.00.
| Result | Value |
|---|---|
| Roofing squares | 10.00 |
| Shingle bundles (3 per square) | 30 |
Tips for an accurate result
- Keep your units consistent — mixing, say, months with years or grams with kilograms is the most common source of error.
- Round only at the very end. Rounding inputs early can shift the final answer noticeably.
- Re-run the numbers whenever an input changes, rather than estimating from an old result.
Prefer not to do the maths by hand? — the Roofing Calculator does it instantly, for free, with the formula and a worked example built in.
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