Quilt Batting Calculator
Batting takes less overhang than backing. At 5 cm per side that is 160 × 210 cm, an area of 3.36 m². Cutting it as large as the backing leaves a thick fold that catches under the foot.
Your numbers
Batting area
3.36m²
Cut width
160cm
Cut length
210cm
Formula
Batting area = (Quilt width + 2 × Overhang per side) × (Quilt length + 2 × Overhang per side) ÷ 10000
Batting is sold in named sizes set in inches — crib, twin, queen. Buying it by the roll lets you join offcuts: butt the edges together rather than overlapping and zigzag them so the loft stays even. Cotton batting shrinks 3–5% in the wash.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Quilt width (cm)The finished quilt across, once bound. | 150 | 1 and up |
| Quilt length (cm)The finished quilt along, once bound. | 200 | 1 and up |
| Overhang per side (cm)Extra beyond each edge, absorbing shift while quilting. | 5 | 0 and up |
Step by step
Quick reference table
Results when only Quilt width (cm) changes and everything else stays put.
| Quilt width (cm) | Batting area (m²) | Cut width (cm) | Cut length (cm) |
|---|---|---|---|
| 75 | 1.79 | 85 | 210 |
| 113 | 2.58 | 123 | 210 |
| 150 | 3.36 | 160 | 210 |
| 225 | 4.93 | 235 | 210 |
| 300 | 6.51 | 310 | 210 |
What each result means
| Result | At default values |
|---|---|
| Batting area (m²)The batting area, a little wider than the quilt on every side. | 3.36 |
| Cut width (cm)The width to cut — finished size plus allowance. | 160 |
| Cut length (cm)The length to cut, finished length plus allowance. | 210 |
Common mistakes
Batting is sold in named sizes set in inches — crib, twin, queen. Buying it by the roll lets you join offcuts: butt the edges together rather than overlapping and zigzag them so the loft stays even. Cotton batting shrinks 3–5% in the wash.
Glossary
- Quilt width
- The finished quilt across, once bound.
- Quilt length
- The finished quilt along, once bound.
- Overhang per side
- Extra beyond each edge, absorbing shift while quilting.
- Batting area
- The batting area, a little wider than the quilt on every side.
- Cut width
- The width to cut — finished size plus allowance.
- Cut length
- The length to cut, finished length plus allowance.
Frequently asked questions
Q. How is Quilt Batting Calculator calculated?
Batting area = (Quilt width + 2 × Overhang per side) × (Quilt length + 2 × Overhang per side) ÷ 10000 — Batting takes less overhang than backing. At 5 cm per side that is 160 × 210 cm, an area of 3.36 m². Cutting it as large as the backing leaves a thick fold that catches under the foot.
Q. Can you walk through an example?
With Quilt width 150cm, Quilt length 200cm, Overhang per side 5cm, the answer is Batting area 3.36m².
Q. What do I need to enter?
Enter Quilt width, Quilt length, Overhang per side. The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Quilt width (cm) moves the answer to Quilt width (cm) 75 → Batting area (m²) 1.79 and Quilt width (cm) 300 → Batting area (m²) 6.51. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
Batting is sold in named sizes set in inches — crib, twin, queen. Buying it by the roll lets you join offcuts: butt the edges together rather than overlapping and zigzag them so the loft stays even. Cotton batting shrinks 3–5% in the wash.
Related calculators
Materials differ in density and absorption. If your label states a figure, use it — the defaults here are only common values.