Knitting in the Round Needle Size Calculator
Circular needle length for a given circumference and stretch.
Compare Your Options And Get Clear Answers
Circular needle length for a given circumference and stretch.
Knitting in the Round Needle Size Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Results update as you change the inputs.
Review
Read the breakdown and the explanation.
Adjust
Change values to compare scenarios.
Knitting Quick Guide
Typical values for reference.
| Finished circumference (cm) | Negative ease (%) | Stitches per 10 cm | Needle length |
|---|---|---|---|
| 56 | 10 | 20 | 50.4 cm needle |
| 100 | 0 | 18 | 100 cm needle |
| 40 | 15 | 24 | 34.0 cm needle |
| 90 | 5 | 22 | 85.5 cm needle |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Knitting in the Calculator FAQ
Answers to common questions about this calculator.
It uses the formula shown with your inputs. Real conditions vary, so treat it as a guide.
Needle length = circumference x (1 – negative ease)
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.
Yes. Replace each input with your own figures and the result updates instantly.