Knitting Tools & Calculators
Knitting Calculator – Free Tools for Knitters
Skip the mental math with our 11 free knitting calculators. Work out gauge, yarn requirements, even shaping, or convert needle sizes.
About the tools
Digital precision for your knitting projects
The math behind stitches, needles and yarn amounts, done for you.
A knitting calculator is a digital tool that does the knitting math for you. Instead of calculating gauge, stitch counts and yarn amounts by hand, you enter the numbers from your swatch or pattern – and get the answer right away.
Here you'll find 11 free tools: work out stitch counts from your gauge, distribute increases and decreases evenly, calculate how much yarn you need, or convert needle sizes between metric, UK and US systems. Everything runs directly in your browser – no registration needed.
Decision Guide
Which calculator do you need?
Find the right tool for your current stage – from planning to final bind-off.
Gauge & Sizing
Everything for swatching, stitches, and needle sizing.
Yarn & Materials
Calculate yardage, skeins, and safe yarn swaps.
Shaping & Progress
Digital assistants while actively knitting.
Catalog
All 11 Knitting Tools
Free, in your browser, no login required.
Gauge Calculator
Calculate exact stitch and row counts from your swatch gauge – or determine how many stitches to cast on.
Yarn Calculator
Where to start with yarn math: total yardage and skeins, skeins of a substitute yarn, and a yarn weight reference table.
Yarn Substitution Calculator
Recalculate skeins and total yardage when substituting yarn with different yardage or skein weights.
Hat Calculator
Find how many stitches to cast on for a hat from head circumference, gauge and the fit you want – with a ribbing count that works out.
Increase & Decrease Assistant
Distribute increases or decreases evenly across the row or round with step-by-step instructions.
Needle Size Conversion
Translate quickly between US, UK and metric millimeter (mm) knitting needle sizes.
Yardage Calculator
Work out the total yardage of a project and how many skeins to buy, from the pattern's total weight and your yarn's ball band.
Knitting Journal
Keep track of active and completed projects — yarn, needles, gauge, pattern and your own notes — directly in your browser.
Row Counter
Digital row counter with pattern repeat counting, and a checklist where you can write your own reminders row by row.
Stitch Counter
A stitch counter and row counter side by side. The count is saved in your browser as you knit, and can be printed.
Unit Converter
Easily convert between inches ↔ cm, ounces ↔ grams, and yards ↔ meters for international patterns.
No tools match your search
Try another keyword or reset the filters to see all tools.
In-Depth Guides & Theory
Need help with the calculations?
The calculators give you the numbers, but these guides explain why they work – and what to do if your knitting still doesn't match.
Q&A
Frequently Asked Questions
What is a knitting calculator?
A knitting calculator is a digital tool that does the knitting math for you: it works out stitch counts from your gauge, distributes increases and decreases evenly, and calculates how much yarn a project needs. On this page you'll find 11 free knitting calculators and tools.
How do I work out the number of stitches for a project?
Knit a swatch and measure your gauge (stitches per 4 in / 10 cm). Then enter the numbers into the gauge calculator, and it tells you how many stitches and rows you need for your measurements – no mental math required.
Is there a knitting calculator for decreases and increases?
Yes. The increase and decrease assistant spaces any number of increases or decreases as evenly as the numbers allow across the row or round, and writes it out as an instruction to knit from.
Do I need an app or a physical knitting calculator?
No. All the calculators on this page run in your browser, on mobile and desktop, with no installation or registration.
Are the knitting tools free to use?
Yes. All the calculators and tools on knittingtips.net are free, with no registration.
Is my data saved when I use a tool?
Tools that remember what you entered save it in your own browser's local storage, not on our servers. It stays on that device, and clearing your browser data deletes it.
Do the tools work on mobile?
Yes. The tools are built to work on phones as well as on desktop, so you can use them while you knit.
Which tool should I start with?
We'd start with the gauge calculator to check a swatch, and the yardage calculator to turn a pattern's total yarn weight into yards and skeins.