Fabric weight calculator: construction to estimated GSM
Estimates a woven fabric’s weight (g/m²) from warp and weft set plus the warp and weft yarn counts.
| Warp set (tel/cm) | Warp count | Weft set (tel/cm) | Weft count | Crimp allowance (%) | Estimated GSM (g/m²) | Warp (g/m²) | Weft (g/m²) |
|---|---|---|---|---|---|---|---|
| 28 | 40 | 24 | 40 | 5 | 81 | 43 | 37 |
| 40 | 30 | 30 | 20 | 6 | 177 | 83 | 94 |
| 52 | 20 | 40 | 16 | 8 | 325 | 166 | 159 |
Estimated — indicative value.
Frequently asked questions
How is fabric weight calculated?
Compute (set × Tex ÷ 10) for warp and weft separately, multiply each by the crimp allowance, then add them. This gives an estimated GSM from construction; the exact weight is confirmed by weighing a sample per ISO 3801.
How does thread density affect weight?
With yarn count held constant, weight scales linearly with set: doubling warp or weft density doubles that direction’s weight contribution. A denser construction means a heavier fabric.
Why add a crimp allowance?
Yarn waves over and under as it interlaces, so it travels farther than the fabric dimension; that extra length adds weight. The 6% default is a typical estimate — higher for tight weaves, lower for open ones.
Why is the result an estimate?
The calculation cannot know actual crimp, finishing gain or loss, or moisture regain; these are approximated with a default crimp allowance. For sample approval, rely on the ISO 3801 weighed result.