Planning basics
Should I add an extra yarn allowance?
There is no single extra percentage that fits every project. Start with what your pattern says and check whether its quantities already include spare yarn. Our planner starts at 0% extra so it does not silently add another margin.
What the percentage does
An optional 10% allowance on 1,200m makes the target 1,320m. With 196m balls, both 1,200m and 1,320m round up to 7 balls. Adding a percentage will not always change the shopping list, because the whole-ball purchase may already cover it.
The order of the calculation
The planner adds your chosen percentage to the full pattern length first, then subtracts your stash, and finally rounds the remaining requirement up to whole balls. For a 600m pattern, 10% extra and a 180m stash, the new purchase needs to cover 480m. At 196m per ball, that is 3 balls.
What an allowance cannot fix
Buying more yarn cannot establish the correct fit, tension or fabric for a different yarn. If the size, stitch pattern or construction changes, return to the pattern’s instructions and the designer’s guidance. A shopping calculator does not generate a tested new pattern.
Record your assumption
Your printable list includes the percentage used. Keep that note with the pattern so you can tell whether the shopping quantity includes an additional allowance. Our examples explain arithmetic; they are not physically tested crochet projects.
Check before you move on
- Check whether the pattern already allows extra
- Separate a chosen percentage from whole-ball surplus
- Add the allowance before subtracting stash
- Record your choice with the project
Try it with your own numbers.
Calculate whole balls or packs for every colour. Subtract your stash and add UK delivery.
Build my list ↗Common questions
Is 10% the recommended allowance?
No. Ten percent is used only as an arithmetic example. The tool starts at zero and does not recommend a universal percentage.
Why did adding an allowance leave the ball count unchanged?
The original whole-ball purchase may already contain enough length to cover the increased target. The tool only buys another ball or pack when the rounded requirement crosses that boundary.
Keep planning
- How many balls of yarn do I need?
- Subtract the yarn you already own
- Check your measuring and planning kit
These are planning methods, not physically tested crochet patterns. Read our method and editorial approach.