How many colours can I use in Fair Isle?

Traditional Fair Isle uses two colours per row, with colours changing throughout the pattern. While some patterns use more than two colours per row, two is standard for manageability. The total number of colours in the design can be many more, just not on the same row.

What is the maximum float length in Fair Isle?

Floats (carried yarn on the back) should ideally be no longer than 5-7 stitches. Beyond that, they can snag when wearing the garment. For longer stretches of one colour, catch the carried yarn every 3-4 stitches by twisting it with the working yarn.

Does Fair Isle use more yarn than stockinette?

Yes, approximately 10-20% more overall. The float yarn on the back adds to total consumption. The exact amount depends on the pattern: designs with long floats use more yarn than designs with frequent colour changes.

KnitCalcs

Fair Isle Calculator — Stitch Counts & Colour Distribution

Calculate stitch counts and colour distribution for Fair Isle (stranded colourwork) patterns.

Total Stitches

Pattern Repeat

Colour 1 Percentage

Total Rows

How We Calculate This

This calculator adjusts your stitch count to fit the Fair Isle pattern repeat and estimates colour distribution.

The formula

Adjusted stitches = Nearest multiple of pattern repeat

Colour 1 stitches = Total stitches x Rows x Colour 1 %

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.