Crochet Calculator
Free crochet calculators for every step of a project: gauge, blanket sizes, how much yarn you need, increasing evenly and pricing your work. Fast on your phone, nothing to install.
- Crochet Gauge CalculatorTurn your swatch into stitches and rows per inch, and how many you need for any size.Open calculator
- Crochet Blanket Size CalculatorStandard blanket sizes from lovey to king, with your starting chain and rows.Open calculator
- Crochet Yarn CalculatorHow much yarn you need, in yards, meters, grams and skeins, from one swatch.Open calculator
- Crochet Increase & Decrease CalculatorSpread increases or decreases evenly and get a line you can crochet straight away.Open calculator
- Crochet Pricing CalculatorPrice your crochet work from materials, hours and fees, two ways side by side.Open calculator
Plan a project in four steps
- Crochet a swatch and measure it with the gauge calculator.
- Choose a finished size. For blankets, the blanket size chart turns it into stitches and rows.
- Weigh the swatch and find out how much yarn you need before you shop.
- Making it to sell? Work out a fair price with the crochet pricing calculator.
Crochet hook size chart (mm to US)
Regular crochet hooks, millimeters to US letter and number sizes, from the Craft Yarn Council.
| Millimeters | US size |
|---|---|
| 2.25 mm | B-1 |
| 2.75 mm | C-2 |
| 3.25 mm | D-3 |
| 3.5 mm | E-4 |
| 3.75 mm | F-5 |
| 4 mm | G-6 |
| 4.5 mm | 7 |
| 5 mm | H-8 |
| 5.5 mm | I-9 |
| 6 mm | J-10 |
| 6.5 mm | K-10½ |
| 8 mm | L-11 |
| 9 mm | M/N-13 |
| 10 mm | N/P-15 |
| 15 mm | P/Q |
FAQ
Which crochet calculator do I need?
Starting a new project: check your gauge, then pick a size and work out your yarn. Following a pattern that says "increase evenly": use the increase & decrease calculator. Selling your work: use the pricing calculator.
Are these calculators free?
Yes. The calculations run in your browser, there’s nothing to sign up for, and we don’t store the numbers you enter.
Can I share a result?
Yes. Every calculator keeps your inputs in the page address. Use "Copy link to this result" and whoever opens it sees the same numbers.
Where do the formulas come from?
Each page lists its sources, such as the Craft Yarn Council’s yarn standards and published worked examples. We test every formula against those examples.
What is the difference between US and UK crochet terms?
The same stitch has a different name: a US single crochet (sc) is a UK double crochet (dc), and a US double crochet is a UK treble. The increase & decrease calculator can write instructions in either.
Sources
Last checked 2026-10-24.