Reed Selection Calculator

Correct reed dent from sett and threading pattern.

Target EPI

Warp width (inches)

Extra selvedge ends (per side)

Tab to move between fields

Recommended reed (dent/inch)

Ends per dent

Actual EPI12

EPI deviation %0

Total dents used80

Total warp ends248

How to Use This Calculator

Enter your target ends per inch (EPI) for the project's warp sett.
Enter the total warp width in inches on the loom.
Enter the number of extra selvedge ends per side for edge durability.
Read the recommended reed size (dents per inch) and the number of ends to thread per dent.
If the ends-per-dent is fractional, alternate between denting patterns — for example, alternate 1 and 2 ends per dent.
Check the actual EPI and EPI deviation to verify the reed choice meets your sett target.

How the result changes with Target EPI

Target EPI: Desired ends per inch (warp sett) for your project.
Warp width (inches): Total width of the warp on the loom.
Extra selvedge ends (per side): Additional doubled or tripled ends at each selvedge for durability.

Recommended reed (dent/inch): Best reed size for your target EPI.
Ends per dent: How many warp ends to thread through each dent. Fractional means alternating pattern.
Actual EPI: Resulting EPI with this reed and threading.
EPI deviation %: How much the actual EPI differs from your target.
Total dents used: Number of reed dents the warp occupies.
Total warp ends: Total warp ends including selvedge additions.

Identify Input Parameters
Target EPI = 12, Warp width (inches) = 20, Extra selvedge ends (per side) = 4 = 3 input(s) provided
Calculate Recommended reed
Recommended reed = 12
4 = 4
Calculate Ends per dent
Ends per dent = threadingDesc as unknown as number
3 = 3
Calculate Actual EPI
12 = 12
Calculate EPI deviation %
EPI deviation % = ((actualEPI - targetEPI) / targetEPI) * 100
0 = 0