Fair Isle chart paper
Chart paper proportioned for stranded colourwork rather than plain knitting, because carrying a second yarn changes the stitch shape.
Opens with these settings already loaded. Change anything you like, then download as PDF, PNG or SVG.
Stranded knitting has its own gauge
A stocking-stitch swatch typically comes out around 0.75 as tall as it is wide per stitch. Stranded colourwork does not: carrying a second yarn across the back tightens the fabric horizontally and the stitch lands closer to 0.8, sometimes higher. Charting Fair Isle on ordinary knitting paper produces motifs that knit up slightly squatter than drawn. Swatch, measure, and set the gauge to what you actually got.
Two colours a row, and short floats
Traditional Fair Isle uses exactly two colours in any given row, and keeps any run of one colour short — five stitches is the usual maximum before the float behind it grows long enough to catch on fingers and rings. Design with that constraint in view: count the longest run in each row before committing, because redrawing a motif is far easier than living with snagging floats.
Motifs are symmetrical for a reason
Peerie patterns and the larger OXO motifs are almost always symmetrical about a vertical axis, and repeat over a stitch count that divides evenly into the round. Chart one repeat plus its mirror rather than the whole circumference, and mark the repeat boundary clearly — that is what you will actually knit from, and unlike the full round it fits on a page.
Printing it accurately
This only measures correctly if your printer doesn't rescale the page. In the print dialog set Scale: 100% — not "Fit to page" or "Shrink oversized pages". If you're not sure it worked, print the calibration page, measure the ruler on it with a real ruler, and it will tell you exactly what your printer is doing to the page.