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Crochet Yarn Requirement Calculator

Work out crochet yarn requirement instantly with clear inputs, formula shown and shareable results.

About Crochet Yarn Requirement Calculator

Crochet fabric weight scales with area, so the requirement is the finished area divided by 100 times the grams per 100 square centimetres measured from a swatch. Crochet uses roughly a third more yarn than knitting for the same area, which is why substituting a knitting pattern's yardage leaves you short.

Formulas

Yarn weight

grams = width x length / 100 x grams per 100 cm2

Yarn length

metres = grams / 100 x metres per 100 g

Worked example

With the default values below, Crochet Yarn Requirement Calculator returns Yarn needed by weight of 345.6. Change any input above and every figure here is recalculated in your browser.

Inputs used

Finished widthminimum 1 cm
90 cm
Finished lengthminimum 1 cm
120 cm
Yarn weight per 100 cm2 of fabricminimum 0.01 g
3.2 g
Yarn length per 100 gminimum 1 m
200 m

Results

Yarn needed by weight
345.6 g
Yarn needed by length
691.2 m
100 g balls to buy
4
Fabric area
10,800 cm2

Step by step

  1. 1Values used
  2. 2Yarn weight
  3. 3Yarn length
  4. 4Yarn needed by weight= 345.6 g
  5. 5Yarn needed by length= 691.2 m
  6. 6100 g balls to buy= 4
  7. 7Fabric area= 10,800 cm2

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Crochet Yarn Requirement figure worked out?

grams = width x length / 100 x grams per 100 cm2. Crochet fabric weight scales with area, so the requirement is the finished area divided by 100 times the grams per 100 square centimetres measured from a swatch.

Why does this matter?

Crochet uses roughly a third more yarn than knitting for the same area, which is why substituting a knitting pattern's yardage leaves you short.

What do I need to enter?

Enter finished width, finished length, yarn weight per 100 cm2 of fabric, yarn length per 100 g. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.

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