Intarsia Calculator — Yarn Lengths for Colour Blocks

Calculate the total stitches in the colour block (stitches x rows), then multiply by the approximate yarn per stitch (which depends on gauge). Add 15-20% extra for tail ends and any adjustments. Wind each colour onto a bobbin or butterfly.

In intarsia, each colour block uses a separate length of yarn with no carrying across the back. Where colours meet, the yarns are twisted together to prevent gaps. In Fair Isle, the unused colour is carried as a float across the back of the work. Intarsia is used for large colour blocks; Fair Isle for small, repeating patterns.

Always twist the two yarns at the colour change: bring the new colour up from under the old colour. This interlocks the stitches at the boundary. Consistent twisting direction prevents gaps without creating bulk.