Crochet Calculator & Tools

Q: How do I know if my crochet pattern is US or UK?

If the pattern uses single crochet it is almost certainly US, because UK terms have no single crochet. UK patterns also say tension instead of gauge and miss instead of skip.

Decode confusing pattern lines, calculate yarn and gauge, convert hook sizes, check US vs UK terms, price your makes, plan a project, and look up any abbreviation — all free, no signup.

Paste one pattern line

Works best one row/round at a time. Example: R6: *7sc, inc* rep from * around (48)

Try one: Increase round Foundation row Bracket repeat Decrease round

Paste a few lines of your pattern

US and UK patterns use the same words for different stitches. This checks which system yours uses.

Search an abbreviation or stitch name

Type “hdc”, “magic ring”, “sk”… to see what it means, with the UK equivalent where it differs.

Gauge Calculator

Crochet a small swatch, then enter what you measured to find your gauge.

Stitches in swatch

Rows in swatch

Swatch size

Unit

Want a width of (optional)

Want a height of (optional)

Yarn Estimator

Make a swatch, note how many yards it used, then estimate the yarn for your full project.

Swatch width

Swatch height

Yards used in swatch

Unit

Project width

Project height

Hook Size Converter

Pick a size to convert between millimetres, US letters/numbers, and UK/old-metric sizes.

Convert by

Choose size

mm	US	UK / old metric

Hook sizing isn’t perfectly standardized between brands — always check your hook’s printed mm size.

Crochet Pricing Calculator

Work out a fair price for a finished item to sell.

Material cost (yarn, notions)

Your hourly rate

Hours spent making it

Other costs (packaging, fees)

Profit margin %

Crochet Project Planner

Fill in your project details and tick off the steps, then tap “Create my plan”.

Project name

Yarn / colour

Hook size

Target size

Deadline

Notes

Checklist

New to reading patterns? How to Read Crochet Patterns →

Free crochet tools for every project

These free crochet calculators and pattern tools take the guesswork out of planning and reading a pattern. Each tool runs in your browser with no signup and nothing to install. Everything assumes US crochet terms unless noted, and the US/UK detector confirms which system your pattern uses.

Frequently asked questions

What does the asterisk (*) mean in a crochet pattern?

An asterisk marks the start of a section you repeat. In *7 sc, inc* repeat around, you work 7 single crochet then an increase over and over until the round is complete.

How do I know if my crochet pattern is US or UK?

If the pattern uses “single crochet” it is almost certainly US, because UK terms have no single crochet. UK patterns also say “tension” instead of “gauge” and “miss” instead of “skip”.

How much yarn do I need for a crochet project?

Crochet a swatch, note how many yards it used, then scale up by area. The Yarn Estimator above does this and adds a safety buffer.

What is crochet gauge and why does it matter?

Gauge is how many stitches and rows fit in a set measurement, usually a 4-inch (10 cm) square. Matching gauge makes a garment or hat come out the right size.

What size crochet hook do I need?

Your yarn label suggests a hook size and the pattern will specify one. The printed mm size on the hook is the most reliable measure across brands.