Warp Beam Capacity Calculator

Maximum warp length from beam diameter and yarn size.

Barrel diameter (inches)

Flange diameter (inches)

Total warp ends

Wraps per inch (WPI)

Beam width (inches)

Tab to move between fields

Max warp length (yards)

17.7

Number of layers37

Effective yarn diameter (in)0.07

Beam width utilization %83.3%

Total yarn on beam (yards)4,236

How to Use This Calculator

Enter the barrel diameter (inner core) of the warp beam in inches.
Enter the flange diameter (outer disc) of the beam in inches.
Enter the total number of warp ends for your project.
Enter the yarn WPI (wraps per inch) to estimate the yarn diameter.
Set the usable beam width in inches between the flanges.
Read the maximum warp length in yards that the beam can hold — ensure your planned warp length fits before winding.

How the result changes with Flange diameter (inches)

Barrel diameter (inches): Diameter of the inner beam barrel (the core rod/tube).
Flange diameter (inches): Diameter of the outer flanges (side discs) on the beam.
Total warp ends: Total number of warp threads to wind onto the beam.
Wraps per inch (WPI): Yarn wraps per inch — used to estimate yarn diameter.
Beam width (inches): Usable width of the beam between flanges.

Max warp length (yards): Maximum warp length that fits on the beam.
Number of layers: How many layers of yarn wrap around the beam.
Effective yarn diameter (in): Estimated yarn diameter under tension (compressed 20%).
Beam width utilization %: How much of the beam width is occupied by the warp.
Total yarn on beam (yards): Total yardage of all warp ends combined on the beam.

Identify Input Parameters
4 parameters
Barrel diameter (inches) = 3, Flange diameter (inches) = 8, Total warp ends = 240, Wraps per inch (WPI) = 12 = 5 input(s) provided
Calculate Max warp length
Max warp length = totalLengthInches / 36
17.7 = 17.7
Calculate Number of layers
Number of layers = floor(windingDepth / effectiveYarnDiam)
37 = 37
Calculate Effective yarn diameter
Effective yarn diameter = yarnDiameter * 0.8
0.067 = 0.067