Pattern math,
done for you.
Enter your gauge and get the numbers instantly — cast-on counts, gauge conversions, even shaping, needle sizes and more.
- 10
- calculators
- Knit + crochet
- both supported
- $0
- free forever
Cast On Calculator
Enter your gauge
Knit a small swatch, count the stitches over 10 cm, and type in your numbers.
Get exact numbers
The calculator updates live — cast-on counts, conversions, shaping — no submit button.
Knit with confidence
Follow the result. Every figure is rounded the way your pattern actually needs it.
Increase / Decrease Evenly Calculator
Turn “increase 8 stitches evenly across row” into exact instructions you can follow.
GaugeGauge Conversion Calculator
Your gauge doesn't match the pattern? Recalculate any stitch count to fit.
ShapingCast On Calculator
From "I want it 50cm wide" to the exact number of stitches to cast on.
ReferenceNeedle & Hook Size Converter
Pattern says "US 8" but your needles are only marked in mm? Look it up instantly.
YarnYarn Unit Converter
Yarn label in yards and ounces, pattern in metres and grams? Convert both instantly.
YarnYarn Remaining Calculator
Weigh your leftover yarn and find out how much length is left before you run out.
YarnYarn Substitution Checker
Thinking of swapping yarns? Check the weight category and meterage match before you buy.
SizingHat Size Calculator
Pick a head size (or enter your own) and get the exact cast-on for a well-fitting hat.
SizingBlanket Size Calculator
Pick a blanket size (or enter your own) and get the exact cast-on and row count from your gauge.
YarnYarn Yardage Estimator
Roughly how much yarn does a hat, sweater or blanket need? Get a ballpark to shop from.
Skip the pattern math.
Ten free calculators for every step of your project — for knitters and crocheters.
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