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Crochet calculators: free yarn, blanket, stitch, gauge and pricing tools

Turn a swatch, a yarn label or a blanket size into exact starting chains, stitch counts, granny square layouts and skein totals. Every calculator shows its working and says whether the answer is exact maths or an estimate, in inches or centimetres and US or UK terms.

free calculators
55
categories
9
  • Free, no account
  • Inches or centimetres
  • US or UK terms
  • Shows the working
Crocheted amigurumi head with an opening, safety eyes in a dish and fibrefill stuffing

Start here

Which crochet calculator do you need?

Pick the question closest to yours. Each one opens the calculator that answers it.

Core calculators

Start with these 6 calculators

The six sums almost every project needs, in the order you usually meet them.

All calculators

All 55 crochet calculators by category

Yarn yardage, substitution and hook size calculators

How much yarn to buy, how much is left in a ball, what to substitute and which hook to use.

Crochet gauge and swatch calculators

Measure your swatch, compare it with the pattern and see what size you will really get.

Stitch count, foundation chain and increase calculators

Starting chains with stitch multiples, stitch and row counts for any size, and evenly spaced shaping.

Blanket size, granny square and C2C calculators

Standard blanket sizes from lovey to king, granny square grids with joins, and corner-to-corner tiles.

Amigurumi sphere and flat circle calculators

Round-by-round counts for flat circles, ovals, spheres and cones, and resizing toys.

Sweater, hat and sock size calculators

Ease, raglan yokes, sleeves, necklines, hats, socks and grading a pattern across sizes.

Border, fringe and tassel calculators

How many border stitches to pick up, the yarn a border takes, and fringe and tassels.

Temperature blanket, stripe and planned pooling calculators

Temperature colour bands, stripe sequences, planned pooling and filet or tapestry charts.

Crochet pricing and project time calculators

Project time, a fair price, selling fees and planning comfortable crochet sessions.

How it works

How crochet calculations work together

Most crochet sums depend on the one before. Get the first steps right and the later answers come out right too.

  1. Yarn and hookChoose the yarn, then a hook that suits it and the fabric you want.Match a hook to your yarn
  2. Swatch gaugeCrochet a swatch, block it and count the stitches and rows in 4 in (10 cm).Work out your gauge
  3. Starting chainTurn your width and gauge into a stitch count that fits the stitch repeat.Find your starting chain
  4. Finished sizeCheck the width and length those stitch and row counts really give you.Check stitches and rows
  5. Yarn to buyScale the yarn your swatch used up to the whole project, plus a margin.Estimate your yarn

Start with a blocked swatch

Crochet a swatch at least 6 in (15 cm) square in the yarn, hook and stitch you will use. Block it the way you will block the project, then count the stitches and rows in the middle 4 in (10 cm). The edges of a swatch are uneven, so measuring right across makes your gauge look wrong.

Yarn follows area, not width

A blanket twice as wide and twice as long covers four times the area, so it needs about four times the yarn. Change both measurements in the calculator rather than doubling a yardage you already have.

Exact maths and estimates

Each calculator is labelled. Exact maths means arithmetic from your numbers, such as stitch repeats, increase spacing and square counts. Based on your swatch is only as good as the swatch you measured. Estimate and Planning aid are starting figures: allow a margin and check them against a sample.

FAQ

Frequently asked questions about crochet calculators

Which crochet calculator should I use first?

Start with the gauge calculator. Almost every other answer, from the starting chain to the yarn you need, depends on how many stitches and rows you get in 4 in (10 cm). Crochet a swatch in your project yarn, block it, count it, then move on to the calculator for your project.

Why does a blanket twice the size need four times the yarn?

Yarn follows area. Doubling the width doubles the area, and doubling the length doubles it again, so the blanket is four times bigger. Enter the new width and length in the yarn yardage or blanket calculator instead of doubling the yarn from a smaller version.

How do I work out a foundation chain when my stitch pattern has a multiple?

A pattern written as a multiple of 6 plus 2 needs a stitch count of 6 times any whole number, plus 2. Work out how many stitches your width needs from your gauge, pick the nearest count that fits, then add the turning chain your pattern asks for. The foundation chain calculator does this and shows the sizes either side.

Should I measure granny squares before or after blocking?

After. Blocking can change the size of a square, and the blanket will be joined from blocked squares. Block a test square the way you will block the rest, measure it, and enter that size in the granny square blanket calculator along with your joining method.

Do the calculators work in centimetres and UK terms?

Yes. Calculators that use measurements have an inches and centimetres switch, and those that name stitches have a US and UK terms switch. Your terms choice is remembered in your browser, so a UK double crochet stays a UK double crochet across the site.

Do I need an account or an app?

No. The calculators are free and run in your web browser on a phone, tablet or computer. There is nothing to install and no sign-up.

How accurate are the results?

Each calculator has a label. Exact maths is arithmetic from your numbers, so it is right if your numbers are. Results based on your swatch are as accurate as your measurements. Estimates and planning aids are starting points, so buy a little extra yarn and check against a sample.

Put your numbers to work: stitches, patterns and guides