Free Crochet Calculators & Tools

Last updated: March 16, 2026

Every crochet project starts with math — how much yarn, what hook size, how many stitches. These free calculators handle the numbers so you can focus on your craft. From amigurumi shapes to granny square blankets, get accurate results instantly with no signup required.

Crochet Essentials and Reference Tools

Yarn estimation, gauge calculation, hook size conversion, and stitch references — the tools you reach for on every project.

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Yarn Calculator

Calculate exactly how much yarn you need for any project — blankets, sweaters, scarves, and more.

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Gauge Calculator

Calculate your gauge from a swatch, resize patterns to a new gauge, and get exact stitch counts.

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Needle Converter

Instantly convert knitting needle and crochet hook sizes between US, UK, metric, and Japanese systems.

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Yarn Weights

Interactive yarn weight chart with US, UK, and Australian names — plus a substitution compatibility checker.

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UK/US Converter

Instantly convert UK crochet patterns to US terminology and vice versa. Handles abbreviations, vintage terms, and full stitch names.

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Stitch Counter

Free online stitch counter with multiple counters, row reminders, and offline support. No login needed.

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Abbreviations

Searchable glossary of knitting and crochet abbreviations with US/UK toggle, stitch descriptions, and step-by-step diagrams.

Crochet Shapes and Construction Calculators

Calculators for amigurumi, flat circles, increase/decrease spacing, granny squares, and corner-to-corner blankets.

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Inc/Dec Calculator

Get stitch-by-stitch instructions for distributing increases or decreases evenly across a row or round.

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Circle Calculator

Generate a flat circle crochet pattern for any stitch type with staggered increases. Enter your stitch and rounds to get the full pattern.

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Amigurumi Shapes

Basic crochet shapes for amigurumi: sphere, cone, cylinder, and oval. Get round-by-round instructions for each shape.

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Granny Planner

Plan a granny square blanket with grid layout, total squares, per-color yardage, and joining yarn estimates.

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C2C Calculator

Plan your corner-to-corner crochet blanket with exact block counts, diagonal rows, and yardage estimates from your gauge swatch.

Blanket & Project Planning

Size your blanket, plan stripe patterns, estimate costs, and figure out how much yarn is left in that partial skein.

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Blanket Calculator

Find the right stitch count, row count, and yarn yardage for any blanket size from baby to king.

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Color Pooling

Calculate the exact stitch count to make variegated yarn pool into argyle and plaid patterns.

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Stash Estimator

Estimate remaining yardage in partial skeins by weight, plus a yardage reference table for unlabeled yarn by weight category.

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Cost Calculator

Calculate the total cost of your project, including yarn, notions, and an estimate of your time.

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Stripe Generator

Generate random or structured stripe patterns with per-color yardage estimates for stash-busting projects.

Also a knitter? See our Knitting Calculators →