Calculating your binding needed is straightforward once you know the Quilt Binding 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 Quilt Binding Calculator.
What is Quilt Binding?
The Quilt Binding calculation tells you your binding needed from a few simple inputs. The figure you are solving for here is the binding needed.
The Quilt Binding formula
The core formula is:
Binding needed = (2 × (Quilt length + Quilt width) + 10) ÷ 36Here is what each input means:
- Quilt length — a value measured in in. Example: 90 in.
- Quilt width — a value measured in in. Example: 90 in.
How to calculate it step by step
- Write down the quilt length (for example, 90 in).
- Write down the quilt width (for example, 90 in).
- Apply the formula above to get your binding needed.
- Double-check the result with the Quilt Binding Calculator.
Worked examples
Example 1
| Input / Output | Value |
|---|---|
| Quilt length | 90 in |
| Quilt width | 90 in |
| Binding needed | 10.28 |
| Quilt perimeter | 360 |
With quilt length of 90 in and quilt width of 90 in, the binding needed works out to 10.28.
Example 2
With quilt length of 180 in and quilt width of 90 in, the binding needed works out to 15.28.
| Result | Value |
|---|---|
| Binding needed | 15.28 |
| Quilt perimeter | 540 |
Example 3
With quilt length of 45 in and quilt width of 90 in, the binding needed works out to 7.78.
| Result | Value |
|---|---|
| Binding needed | 7.78 |
| Quilt perimeter | 270 |
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 Quilt Binding Calculator does it instantly, for free, with the formula and a worked example built in.
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