How to use this calculator
- Enter or choose size labels, smallest to largest.
- Enter or choose base (sample) size.
- Enter or choose base size measurement.
- Enter or choose grade per size below the base.
- Enter or choose grade per size above the base.
- The graded measurements updates as you type. Use Copy result or Share to keep it.
Method
Size k below base: M − k × Grade down; size k above base: M + k × Grade up
- M
- base size measurement
- k
- number of sizes away from the base
- Grade
- increment between neighbouring sizes
Worked example
- Below M: S = 100 − 4 = 96; XS = 100 − 2 × 4 = 92.
- Above M: L = 100 + 5 = 105; XL = 110; XXL = 115.
- Spread = 115 − 92 = 23.
A 100 cm chest at size M grades to 92, 96, 100, 105, 110 and 115 cm from XS to XXL.
What the result means
Use it for one point of measure at a time (chest, waist, length). Body length, sleeve length and width usually have different grades.
Assumptions and limits
- Grading is linear: the same increment for every size step on each side of the base.
- Grade rules are brand- and market-specific; enter your own. Pattern-point grading on CAD distributes the increment across several points.
Questions
Why have a different grade above and below?
Many brands use a larger jump for bigger sizes (for example 4 cm below and 5–6 cm above) so larger sizes fit better.
Can I use numeric sizes?
Yes. Enter labels such as 36, 38, 40, 42 and pick one as the base.