Colour Block Calculator — Calculate yarn for colour block sections.
Calculate yarn for colour block sections.
How We Calculate This
This calculator divides your total yarn requirement by colour percentage to estimate how much of each colour you need.
The formula
Colour yarn = Total yarn x Colour percentage / 100
With extra = Colour yarn x (1 + Extra %) + tail waste
Each colour change leaves two tails to weave in — one in the colour that ends and one in the colour that begins. So each colour carries one tail length (Tail Waste Per Join x Number of Colour Changes) on top of its share, and the project total is two tails per join.
Frequently Asked Questions
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Last updated: February 2026
All calculations are estimates based on standard yarn weights and gauge. Results may vary with individual tension, yarn brand, and needle size.