WeaveCompass
Planner / Tools / Warp ends and threading repeat calculator

Warp ends and threading repeat calculator

Calculate body ends, round up to a complete threading repeat, and add floating ends.

Free · no account

Enter your measurements

in · This is before finishing losses.
EPI · Body sett; exclude floating ends.
ends · Use 1 when no repeat rounding is needed.
ends · Included in yarn; excluded from body width.

Your result

How the calculation works

body ends = ceil(reed width × EPI ÷ repeat) × repeat; total = body + floating ends

This rounds the body upward so you do not silently lose target width. A draft may require additional balancing or border ends; enter a body width that accommodates those, or adjust your draft independently. This is not a draft validator.

Full calculation methodology

Worked example

18 in at 20 EPI gives 360 body ends. A 4-end repeat fits exactly; two floating ends bring the total to 362.

Use the complete weaving planner to connect the dimensions, allowances, and yarn quantities for one project.

Reference: Planning references and independent arithmetic. Calculations run locally.

Continue your plan

At the loom

Reed substitution calculator

Find a repeating ends-per-dent sequence and see the sett it actually produces.

At the loom

Straight-draw heddle count calculator

Count heddles per shaft for a straight draw beginning on shaft one.

Plan your warp

Warp yarn yardage calculator

Turn an end count and winding length into total warp yarn and a purchase reserve.