How to Adjust a Pattern When Your Gauge Is Off

What gauge is

Gauge is how many stitches and rows fit in a set length, usually 10cm or 4 in, and every pattern states one. Two knitters with the same yarn and needles can still land on different gauges because tension varies from hand to hand.

Knit a pattern's numbers at the wrong gauge and the finished size changes. A pattern at 22 sts per 10cm knit by someone at 20 sts comes out about ten percent wider. So you either change needles to match the pattern, or you rescale the numbers to your gauge.

Stitch counts scale by proportion

Your stitch count is the pattern count times your gauge divided by the pattern gauge, and rows work the same way. Ashley Lillis writes it as two steps: divide the cast-on by the pattern gauge to get a length, then multiply that length by the new gauge.

Her example casts on 56 sts at 10 sts per 4 in. That is 22.4 in, and at the new gauge it works out to 89.6, which she rounds up to 90. Merge the two steps and you get the proportion above, which is what this calculator runs.

When you start from a size, multiply it by your gauge and divide by the gauge length. A 90cm chest at 20 sts per 10cm is 180 sts.

What this calculator does

The math usually lands on a decimal. There is no standard rounding rule, so this calculator rounds to the nearest whole number and rounds 0.5 up. The rule is printed under every result.

With a stitch multiple, the rounded count moves to the closest count that fits. Use 4 for 2x2 rib, and put edge stitches in the extra box. A tie goes to the larger count, so a garment errs roomy rather than tight.

Next to each result you see the size it knits to at your gauge and the size the pattern intended, so you can tell what fitting the multiple cost you. Leave the row gauge blank to get stitches only; fill it in and you get a target row count you can take to the Danko counter.

Measuring your gauge

Craft Yarn Council says gauge swatches are generally 4 in by 4 in, unless you are working in rounds. Knit a little wider than that in the stitch and needle the pattern names, then measure the middle so edge stitches stay out of the count.

The same article says that if your swatch is smaller than the pattern's size, redo it with needles one or two sizes bigger. That is where you choose: change needles and keep the pattern's numbers, or keep your needles and rescale the numbers here.

Increasing and decreasing evenly

When a pattern says to increase so many stitches evenly, divide your stitch count by that number. In Kate Atherley's example, 48 sts with 6 increases is 6 groups of 8: (K8, m1) 6 times in the round, and (K4, m1, k4) 6 times flat so no increase sits at an edge.

kfb uses up a stitch, so each group has one plain knit fewer. k2tog uses two. Her decreases read (K6, k2tog) 6 times in the round and (K3, k2tog, k3) 6 times flat.

Remainders are where calculators slip. 10 rows a day splits leftover stitches between the two edges, and mentions a more precise way: alternate groups of 7 and 8. This calculator alternates, then runs the instruction stitch by stitch and shows the count you end with.

Where people get stuck

Stitches match but the length is off: check your row gauge. If the pattern shapes every so many rows, a different row gauge changes that spacing, so convert the row count too.

The size shifted after fitting a multiple: look at the size next to the result. Keeping the repeat means adding or dropping a few stitches. If the gap is large, changing needles may serve you better.

More increases than stitches will not fit in one row, so spread them over two. k2tog needs two stitches each, so one row can remove at most half your stitches.