Free Fabric Calculator – How Much Fabric You Need
Buying fabric without a plan is how good projects stall. You guess at the shop, buy too little, and the perfect print is gone when you go back.
Free Fabric Calculator
The calculator adds 2 inches to the length for seams and hems, then adds 10% for cutting waste. The answer is rounded up to the nearest quarter yard.
The fix is simple: measure first, then work out the yardage.
Fabric is sold by the yard, and its width changes how much you need. A narrow bolt needs more length than a wide one for the same project.
This free fabric calculator does that maths for you. Enter your project size, the number of pieces, and your fabric width, and it gives you the yards to buy, plus metres.
It also shows the answer in metres, so the same result works wherever you shop. No charts, no guesswork — just the number to ask for at the counter.
How to Use This Calculator
Example
Say you are making two cushion covers, each 18 inches square, from 44-inch fabric.
First add 2 inches to the length for seams. That gives 20 inches, so one piece needs 20 times 18, which is 360 square inches.
Two pieces need 720 square inches in total. Divide by the fabric area in one yard: 44 times 36, which is 1,584.
That gives 0.45 yards before waste. Add 10% for cutting and mistakes, and the answer is 0.5 yards — about 0.46 metres.
Buy half a yard and you will have enough, with a little spare. A bigger project works the same way — just change the numbers.
Try a bigger project too. A curtain panel 60 inches long and 40 inches wide, cut once from 60-inch fabric, needs 1.5 yards after waste is added.
The Bottom Line
Guessing at the fabric shop costs money twice over. Too little means a second trip, and too much means leftover fabric you may never use.
A tape measure and this calculator take the guesswork out. Measure once, enter the numbers, and buy the rounded-up answer with confidence.
The 10% waste allowance is there for a reason. Cutting mistakes, pattern matching, and uneven bolt ends all eat a little fabric.
Keep this calculator open on your phone at the shop. It works for cushions, curtains, quilts, and simple dressmaking — any project cut from flat fabric.
Buy the fabric, wash it if your project needs it, and cut with the pattern facing the right way. A careful start saves far more time than a quick one.
Frequently Asked Questions
Why does the calculator add 2 inches to the length?
The extra 2 inches cover seam allowances and hems. Without it, your finished piece would come out smaller than you planned, and the edges would have nothing to turn under.
What is the 10% waste allowance for?
Cutting mistakes, uneven bolt ends, and pattern matching all use extra fabric. The 10% covers those losses, so you finish the project instead of running short.
Which fabric width should I choose, 44 or 60 inches?
Most quilting cottons are 44 inches wide, while many dress fabrics are 60 inches. Check the end of the bolt or the shop listing before you choose.
Why is the answer rounded up to the nearest quarter yard?
Shops cut fabric in quarter-yard steps, so an exact figure like 0.5 yards is what you can actually buy. Rounding up also leaves a little spare for mistakes.
How do I convert yards to metres?
Multiply yards by 0.914 to get metres. Half a yard is about 0.46 metres, and the calculator shows both figures so you can shop in either unit.
Can I use this for curtains or a quilt?
Yes, for any project cut from flat fabric. Measure the largest piece, count all the pieces, and enter the fabric width — the same maths works for curtains, quilts, and cushions.
Keep Exploring
More DIY ideas you will love.
