Rug Hooking Wool Calculator
Traditional rug hooking pulls narrow wool strips up through a backing to form loops. Because the loops stand proud and pack tightly, a finished rug consumes several times more wool than its flat surface area, so a small mat can eat a surprising amount of fabric. This calculator multiplies your design area by a wool-to-area ratio that you set to match your loop height, strip cut, and packing density, then adds a waste allowance and converts the result to fabric length using your fabric's usable width. Because no single official wool-per-inch figure exists, every density assumption stays a clearly labeled, editable input.
Wool quantity formula
design area = design width * design height
wool area = design area * multiplier
wool with waste = wool area * (1 + waste / 100)
square yards = wool with waste / 1,296
fabric length = wool with waste / fabric usable width
One square yard equals 1,296 square inches (36 inches times 36 inches). Fabric length is the linear length you would cut from a bolt of the usable width you entered.
Using the result
- Higher loops and tighter packing raise the multiplier; low loops and open hooking lower it.
- Narrow strip cuts (a number 3 cut) generally use more fabric than wide cuts for the same coverage.
- Recycled wool yardage varies by garment, so weigh or measure your stash before relying on the area figure.
- For multi-color rugs, run the calculator once per color block and add a margin for color matching.
- If you buy by weight, multiply the square-yard result by your wool's ounces per square yard.
Rug hooking wool: frequently asked questions
How much wool does a hooked rug need?
A common rule of thumb is that you need roughly four to five times the area of the finished design in wool fabric, because the strips are pulled up into loops that consume far more material than the flat area they cover. This calculator uses a wool-to-area multiplier you can set to match your loop height, cut width, and packing density.
Why is the multiplier adjustable?
The exact amount of wool per square inch depends on your loop height, the cut width of your strips, and how densely you pack the loops. No single official figure exists. This calculator keeps the multiplier as a user-editable input so you can dial it to your own technique or your guild's guidance, rather than hardcoding a guess.
What does the wool fabric area mean in practice?
The result is the flat area of wool fabric you should buy. To convert it to a familiar quantity, divide by your fabric's usable width to get linear length, or estimate weight using the fabric's ounces per square yard if you buy by weight.
How do I handle a multi-color design?
Enter the area for each color block separately and sum the results, or estimate the dominant background separately from the motifs. The total wool needed is the sum across all colors plus a waste allowance.
Should I add extra for waste?
Yes. Strip ends, mis-cuts, and color matching all consume extra fabric. A 10 to 20 percent waste allowance is sensible. Add it to the multiplier or buy a little extra of each color so you do not run short mid-project.
Official sources
- U.S. National Institute of Standards and Technology: Office of Weights and Measures (inch, yard and area definitions).
- NIST: National Institute of Standards and Technology (unit conversions).
Reviewed by the CalculatorHub team, edited by James Graham, 17 June 2026. See our methodology.