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THE FEUTEX TOOLKIT

Yarn Substitution by Length

Replace yarn by total length while comparing package mass and leftover length.

Knitting workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaSkeins = Math.ceil(old_skeins*old_length*(1+extra/100)/new_length); Mass = Math.ceil(old_skeins*old_length*(1+extra/100)/new_length)*new_mass; Spare length = Math.ceil(old_skeins*old_length*(1+extra/100)/new_length)*new_length-old_skeins*old_length*(1+extra/100)

Worked example

Inputs

Old skeins
8 skeins
Old length
120 m/skein
New length
160 m/skein
New mass
50 g/skein
Extra
10 %

Expected results

Skeins
7 skeins
Mass
350 g
Spare length
64 m

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter the measured quantities and your own planning assumptions.
  2. Review all calculated outputs and the stated limitations.

Try this example

{
  "old_skeins": 8,
  "old_length": 120,
  "new_length": 160,
  "new_mass": 50,
  "extra": 10
}

Accuracy and scope

Length equivalence does not guarantee matching gauge, drape or fiber behavior. Make a swatch.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.