Knitting Calculator – Free Tools for Knitters
Ten free knitting calculators and tools that do the knitting math for you – right in your browser, no registration needed.
What is a knitting calculator?
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. It saves time and prevents the classic miscalculations that end in too-tight sweaters or too little yarn.
Here you'll find ten free knitting calculators and 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 in the browser – on mobile and desktop, no registration needed.
Which knitting calculator do you need?
Working out stitch counts?
The gauge calculator finds stitch and row counts from your swatch.
Decreasing or increasing evenly?
The increase and decrease calculator distributes shaping evenly across the row or round.
Unsure about yarn amounts?
The yarn calculator works out how many skeins your project needs.
Converting needle sizes?
The needle conversion translates between metric, UK and US sizes.
All tools
Yarn Calculator
Planning to knit a garment without a specific pattern? Use our smart yarn calculator to accurately estimate your yarn requirements.
Gauge Calculator
Compare your knitting gauge with the pattern and get needle size recommendations.
Yarn Substitute
Looking to substitute yarn in a pattern? Easily calculate exactly how many skeins you will need when switching to an alternative yarn.
Increase/Decrease Assistant
Hate the tricky math? Our increase/decrease assistant provides exact step-by-step instructions to evenly distribute your stitches.
Needle Sizes
Needle sizes can be confusing! Use this handy conversion tool to quickly translate between metric (mm), US, and UK knitting needle sizes.
Yardage Calculator
Calculate the total yardage and required amount of yarn for your knitting stashes to make sure you have enough yarn for your project.
Knitting Diary
Keep a tight schedule on all of your active and finished knitting projects, as well as your yarn and needles in a smart digital diary.
Row Counter
A smart digital row counter to help you keep track of your active knitting pattern row by row, complete with useful custom reminders.
Stitch Counter
A very simple, interactive knit stitch counter right in your web browser! Perfect for keeping accurate track of the stitches and rows in your pattern.
Unit Converter
Struggling with international knitting recipes? Convert seamlessly and accurately between metric cm/meters and imperial inches/yards.
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 10 cm / 4 inches). 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.