Category · Fashion & Sewing · Tool 20
Armhole Measurement Calculator
Estimate armhole circumference from an armhole radius and curve fraction.
Fashion & SewingFree calculatorGlobal units
Calculator
Method: Arc length = 2πr × selected fraction. Use this as a geometric estimate, not a substitute for a drafted armhole.
Result
Calculated from the values entered.
Use the result as a planning estimate. For garment-specific fitting, pattern instructions and manufacturer size charts should take precedence.
How to use this calculator
What to enter
Enter or select the following as requested: Armhole radius; Curve fraction; Unit. Follow the units, valid ranges, examples, and options displayed beside each field.
What the result means
The sewing or garment result estimates a measurement, fabric quantity, pattern dimension, size conversion, or project cost from the values entered. Check the measurement method, fabric width, shrinkage, seam allowance, fit preference, and size-system convention used.
When to use it
Use this to plan garment construction, alterations, fabric purchases, or pattern scaling. Measure carefully and make a test or fitting sample where a small difference could affect the finished item.