Free crochet calculators for stitches, rows, and yarn
Work out your cast-on, yardage, sizing, and prices before you start. 19 calculators and practical guides, free with no account.
How many stitches to cast on?
144stitches to cast on
Gauge: 4.00 stitches per inch
Calculators
All 19 toolsGauge & Stitch6
Swatches, stitch counts, foundation chains, increases, and hook converters.
Crochet Gauge Calculator
Calculate stitch density and precise rows and stitches needed for your target project dimensions.
Crochet Hook Size Converter
Convert between US letter/number sizes, UK vintage numbers, and precise metric millimeter hook sizes.
Stitch Count Calculator
Calculate the exact number of stitches needed to resize any pattern or match custom dimensions.
Chain Calculator
Calculate exact starting foundation chain count with turning chain and pattern repeat adjustments.
Crochet Increase Calculator
Evenly distribute increase stitches across any row or round with step-by-step crochet instructions.
Crochet Decrease Calculator
Distribute decreases smoothly across any row or round with human-readable crochet instructions.
Yarn3
Yardage estimators, weight converters, skein counts, and fiber calculators.
Yarn Calculator
Estimate total yardage, meters, and skein count needed for blankets, scarves, sweaters, and shawls.
Yarn Weight Converter
Compare Craft Yarn Council categories (0 to 7), WPI, ply equivalents (US/UK/AUS), and hook pairings.
Skein Calculator
Calculate how many skeins or balls of yarn to buy based on yardage, grams, and ounces.
Project Size6
Blankets, hats, scarves, granny squares, and amigurumi sizing.
Crochet Project Blueprint Calculator
All-in-one crochet project calculator: compute foundation stitches, rows, yarn yardage, skeins, cost, and hours.
Blanket Size Calculator
Standard blanket dimensions (Baby to King), estimated rows, stitches, and yardage requirements.
Granny Square Calculator
Calculate how many granny squares and joins you need to reach any finished blanket dimensions.
Crochet Hat Size Calculator
Calculate crown circle diameter, total hat height, and stitches for preemie to adult sizes.
Scarf Size Calculator
Calculate width, length, stitches, rows, and yarn yardage for standard scarves, cowls, and infinity wraps.
Amigurumi Size Calculator
Scale amigurumi toy patterns up or down by switching yarn weights and hook sizes.
Color & Generators2
Color palettes, temperature blanket brackets, and colorway planning.
Time & Cost2
Fair pricing calculators, time estimations, and business tools.
AI assistants5
Describe a problem or a project in plain words and get a structured answer.
AI Crochet Project Planner
Plan your next project with structured material checklists, hook recommendations, and construction plans.
AI Crochet Troubleshooter
Diagnose curling, uneven edges, holes, or widening blankets with practical solutions.
AI Yarn Substitution Assistant
Safely find yarn substitutes considering fiber drape, weight class, and gauge changes.
AI Crochet Pattern Assistant
Get structured project outlines and step-by-step crochet guidance from plain English descriptions.
AI Crochet Color Palette Generator
Generate harmonious yarn colorways with hex codes, yarn shade names, and interactive blanket & granny square previews.
Guides
All guides- Crochet Basics8 min read
What Is Crochet Gauge? How to Measure It and Why It Matters
Gauge is the translation key between the designer's hands and yours. Learn how to make a swatch that tells the truth, measure it, match the pattern, and use the math to size any project.
Read guide 
Yarn8 min readHow Much Yarn for a Crochet Blanket? Chart and 3 Ways to Estimate
A full yardage chart for every blanket size, what changes the numbers, and three ways to estimate, including a swatch method that's accurate to within a few percent.
Read guide- Crochet Hooks7 min read
Crochet Hook Sizes Chart: mm, US Letters and UK Sizes Explained
Why millimeters are the only size you can trust, a full conversion chart, steel hooks, which hook suits which yarn, and how hook shape and material change the way you crochet.
Read guide - Yarn7 min read
Yarn Weight Chart: Categories 0 to 7 Explained for Crochet
What yarn weight really means, the standard 0–7 chart with hooks and gauges, international ply names, how to identify unlabeled yarn, and how to substitute one yarn for another.
Read guide 
Crochet Basics5 min readUS vs UK Crochet Terms: Conversion Chart and How to Tell Them Apart
A UK double crochet is a US single crochet. Here's the full conversion chart, why the systems differ, how to spot which one a pattern uses, and how to convert without mistakes.
Read guide- Crochet Basics8 min read
How to Read a Crochet Pattern: The Complete Guide
Every part of a crochet pattern explained, from skill levels and multiple sizes to repeats, stitch counts, shaping language, charts and schematics, plus what to do when something seems wrong.
Read guide
How the calculators work
Formulas you can check
Every calculator shows the formula it uses, so you can see exactly how a number was reached.
Editorial policyIndustry standards
Yarn weights and hook sizes follow Craft Yarn Council definitions. No yarn brand pays to be recommended.
About usPrivate by design
Calculators run in your browser. The numbers you enter are not sent to or stored on our servers.
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