Knitting Tools & Calculators
Knitting Calculator – Free Tools for Knitters
Skip the mental math with our 10 free knitting calculators. Work out gauge, yarn requirements, even shaping, or convert needle sizes.
About the tools
Digital precision for your knitting projects
Skip the mental math and avoid common calculation errors with stitches, needles, and yarn requirements.
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 ten 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 10 Knitting Tools
Free browser-based tools with no login required – saved locally on your device.
Gauge Calculator
Calculate exact stitch and row counts from your swatch gauge – or determine how many stitches to cast on.
Yarn Calculator
Estimate yarn requirements and number of skeins for sweaters, hats, scarves, blankets and socks based on measurements.
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
Calculate total yarn length and weight from skein counts, or find yards per 3.5 oz (100 g) for your stash.
Knitting Journal
Keep track of active and completed projects, yarn stash, needle sizes, and personal notes directly in your browser.
Row Counter
Digital counter with pattern repeat intervals, shaping reminders, and a distraction-free fullscreen mode.
Stitch Counter
Simple and fast stitch counter with keyboard shortcuts, sound feedback, and automatic local storage.
Unit Converter
Easily convert between inches ↔ cm, ounces ↔ grams, and yards ↔ meters for international patterns.
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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 ten 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 calculator distributes any number of increases or decreases perfectly evenly across the row or round, and gives you a clear step-by-step plan to follow while you knit.
Do I need an app or a physical knitting calculator?
No. All the calculators on this page run right in your browser, on both mobile and desktop, with no installation or registration. A physical knitting calculator or app can be handy, but it does the same calculations as the tools here – just less flexibly.
Are the knitting tools free to use?
Yes, all the calculators and tools on knittingtips.net are completely free, with no registration or hidden costs.
Is my data saved when I use a tool?
Most tools save your information locally in your own browser (localStorage), not on our servers. That means you stay in full control of your own data.
Do the tools work on mobile?
Yes, all the tools are designed to work just as well on mobile as on desktop, so you can use them while you knit.
Which tool should I start with?
Most people start with the gauge calculator to check their swatch, and the yarn calculator to work out how much yarn a new project needs.