Yarn Yardage Estimator
Estimate how much yarn a project needs from your own gauge swatch. Measure the yarn that went into a swatch of known size, enter the finished dimensions, and the tool scales it up with a margin for safety.
For a garment or a shaped piece, add up the rough area of each flat panel and enter that as the finished size. A margin of 10 to 20 percent covers seaming, edging, and a small reserve.
Estimated yarn needed
4,140 yd
About 4,140 yards or 3,786 metres, margin included.
Typical finished yardage (worsted weight)
| Project | Worsted weight |
|---|---|
| Adult hat | 120 to 220 yd |
| Cowl | 200 to 350 yd |
| Scarf | 300 to 550 yd |
| Adult sweater | 1,000 to 1,500 yd |
| Baby blanket | 700 to 1,100 yd |
| Throw blanket | 1,200 to 2,200 yd |
Ballparks for a sanity check. Fingering and DK need more length for the same size; bulky needs less. Cables and colourwork use more than plain stockinette.
Buy for the dye lot, not the exact number
Round up to whole balls and buy them in one dye lot, since a mid-project top-up rarely matches. The swatch method is only as good as the swatch, so wash and block it first.
Yarn yardage FAQ
How much yarn do I need for my project?
The reliable way is to measure your gauge swatch: work out how much yarn went into a swatch of known size, then scale that to the finished area and add a margin. As a rough guide in worsted weight, an adult hat is about 120 to 220 yards, a scarf 300 to 550, an adult sweater 1,000 to 1,500, and a throw 1,200 to 2,200. Lighter yarn needs more length for the same size.
How do I calculate yarn from a swatch by weight?
Weigh your finished swatch in grams. Read the ball band for the full ball's length and weight to get length per gram, then multiply by the swatch weight to get the length used in the swatch. This tool does that step for you when you choose to measure by weight, so a kitchen scale is all you need.
How much extra yarn should I buy?
Add roughly 10 to 20 percent over the estimate to cover seaming, edging, and a small reserve, then round up to whole balls. Buy them all in the same dye lot, because a ball bought later often reads as a slightly different shade even under the same colour name.
Why do yarn estimates vary so much?
Yardage depends on gauge, yarn weight, stitch pattern, size, and how tightly you work. Cables and colourwork use noticeably more than plain stockinette, and going up a yarn weight uses less length for the same size. That is why a swatch you actually made beats any published estimate.