How Many Skeins Calculator
You cannot buy part of a ball, so the division rounds up. Adding the spare before rounding matters: round first and a genuine shortfall of one ball disappears from the answer.
Your numbers
Balls
6balls
Yarn length needed
1,035m
Formula
Balls = ⌈Yarn length needed × (1 + Spare ÷ 100) ÷ Metres per ball⌉
The length on a label is nominal. Two balls of the same weight can differ by several metres, so buying the exact number risks running out in the last few rows.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Yarn length needed (m)The yarn length in metres, matching the label. | 900 | 1 and up |
| Metres per ball (m)Metres in one ball or skein, as stated on the band. | 200 | 1 and up |
| Spare (%)The margin you keep for finishing and dye-lot mismatch. | 15 | 0 ~ 100 |
Step by step
Quick reference table
Results when only Yarn length needed (m) changes and everything else stays put.
| Yarn length needed (m) | Balls (balls) | Yarn length needed (m) |
|---|---|---|
| 450 | 3 | 518 |
| 675 | 4 | 776 |
| 900 | 6 | 1,035 |
| 1,350 | 8 | 1,552 |
| 1,800 | 11 | 2,070 |
What each result means
| Result | At default values |
|---|---|
| Balls (balls)Balls to buy; you cannot split one, so it rounds up. | 6 |
| Yarn length needed (m)The yarn length in metres, matching the label. | 1,035 |
Common mistakes
The length on a label is nominal. Two balls of the same weight can differ by several metres, so buying the exact number risks running out in the last few rows.
Glossary
- Yarn length needed
- The yarn length in metres, matching the label.
- Metres per ball
- Metres in one ball or skein, as stated on the band.
- Spare
- The margin you keep for finishing and dye-lot mismatch.
- Balls
- Balls to buy; you cannot split one, so it rounds up.
Frequently asked questions
Q. How is How Many Skeins Calculator calculated?
Balls = ⌈Yarn length needed × (1 + Spare ÷ 100) ÷ Metres per ball⌉ — You cannot buy part of a ball, so the division rounds up. Adding the spare before rounding matters: round first and a genuine shortfall of one ball disappears from the answer.
Q. Can you walk through an example?
With Yarn length needed 900m, Metres per ball 200m, Spare 15%, the answer is Balls 6balls.
Q. What do I need to enter?
Enter Yarn length needed, Metres per ball, Spare. The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Yarn length needed (m) moves the answer to Yarn length needed (m) 450 → Balls (balls) 3 and Yarn length needed (m) 1,800 → Balls (balls) 11. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
The length on a label is nominal. Two balls of the same weight can differ by several metres, so buying the exact number risks running out in the last few rows.
Related calculators
Materials differ in density and absorption. If your label states a figure, use it — the defaults here are only common values.