Sett Calculator
Ends per inch from yarn size and weave structure.
Inputs
%
Results
Recommended EPI
6
Balanced PPI
6
Weft-faced PPI9
Warp-faced PPI3.6
EPI from diameter0
Weave NamePlain weave
How to Use This Calculator
- Wrap your yarn around a ruler for 1 inch (snugly, without overlapping) and count the wraps — enter this as WPI.
- Select the weave structure: plain weave, twill, satin/sateen, or lace/open.
- Set the desired coverage percentage — 100% for balanced cloth, lower for open weaves, higher for rep weave.
- Optionally enter the yarn diameter in inches measured with calipers for a cross-check.
- Read the recommended EPI and the balanced PPI for a square, balanced weave.
- Compare the warp-faced and weft-faced PPI values if you want a surface dominated by one yarn.
How the result changes with Wraps per inch (WPI)
| Wraps per inch (WPI) | Recommended EPI | Balanced PPI |
|---|---|---|
| 11 | 5.5 | 5.5 |
| 36 | 18 | 18 |
| 65 | 32.5 | 32.5 |
| 90 | 45 | 45 |
What each input means
- Wraps per inch (WPI)
- Wrap yarn around a ruler for 1 inch, counting turns laid side by side without overlapping.
- Weave structure
- 0 = Plain weave, 1 = Twill, 2 = Satin/Sateen, 3 = Lace/Open.
- Coverage %
- 100% = standard balanced cloth. Lower for open weaves, higher for rep weave.
- Yarn diameter (inches, optional)
- Optional: measure yarn diameter with calipers for cross-check. Leave 0 to skip.
What each result means
- Recommended EPI
- Optimal ends per inch for your yarn and weave structure.
- Balanced PPI
- Picks per inch for a balanced weave (PPI = EPI).
- Weft-faced PPI
- PPI for weft-faced fabric (weft dominates surface).
- Warp-faced PPI
- PPI for warp-faced fabric (warp dominates surface).
- EPI from diameter
- Cross-check EPI calculated from yarn diameter (0 if not provided).
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersWraps per inch (WPI) = 12, Weave structure = 0, Coverage % = 100, Yarn diameter (inches, optional) = 0 = 4 input(s) provided
- Calculate Recommended EPIRecommended EPI = baseSett * coverageFactor6 = 6
- Calculate Balanced PPI6 = 6
- Calculate Weft-faced PPIWeft-faced PPI = recommendedEPI * 1.59 = 9
- Calculate Warp-faced PPIWarp-faced PPI = recommendedEPI * 0.63.6 = 3.6
Related Calculators
The questions that sit next to this one — chosen by subject, including calculators filed under a different category.
Weaving
Yarn Quantity Calculator
Warp and weft yardage from project dimensions and sett.
WeavingReed Selection Calculator
Correct reed dent from sett and threading pattern.
WeavingColor-and-Weave Effect Calculator
Pattern prediction from threading and color sequence.
Textile ScienceWeave Draft Generator
Generate threading and treadling parameters for basic weave structures including plain, twill, satin, and basket weaves.
Technology & ComputingScreen PPI Calculator
Calculate pixels per inch (PPI), dot pitch, aspect ratio, and physical dimensions of any display.
More in Crafts, Hobbies & Games.