Pattern math, done for you.

Increase / Decrease Evenly Calculator

Turn “increase 8 stitches evenly across row” into exact instructions you can follow.

Sleeve Taper Calculator

Turn "60 sts down to 40 over 120 rows" into exactly which rows to shape on.

Hat Crown Decrease Calculator

Finished the hat body? Get the round-by-round decreases to close the crown neatly.

Gauge Conversion Calculator

Your gauge doesn't match the pattern? Recalculate any stitch count to fit.

Cast On Calculator

From "I want it 50cm wide" to the exact number of stitches to cast on.

Needle & Hook Size Converter

Pattern says "US 8" but your needles are only marked in mm? Look it up instantly.

WPI to Yarn Weight

Lost the ball band? Wrap the yarn round a ruler and find out what weight it is.

Yarn Unit Converter

Yarn label in yards and ounces, pattern in metres and grams? Convert both instantly.

Yarn Remaining Calculator

Weigh your leftover yarn and find out how much length is left before you run out.

Yarn Substitution Checker

Thinking of swapping yarns? Check the weight category and meterage match before you buy.

Hat Size Calculator

Pick a head size (or enter your own) and get the exact cast-on for a well-fitting hat.

Sock Size Calculator

Pick a foot size (or measure your own) and get the cast-on for socks that stay up.

Blanket Size Calculator

Pick a blanket size (or enter your own) and get the exact cast-on and row count from your gauge.

Yarn Yardage Estimator

Roughly how much yarn does a hat, sweater or blanket need? Get a ballpark to shop from.

Stitch Repeat Calculator

Cast on a number that fits your "multiple of X plus Y" pattern repeat — no fudging.

Pick Up Stitches Calculator

How many stitches to pick up along an edge — and how to space them evenly.

Buttonhole Spacing Calculator

Turn "space 5 buttonholes evenly" into the exact stitches between each one.

Raglan Sweater Calculator

Split a raglan neckline into back, front and sleeves — and count the increase rounds.

Gauge from Swatch Calculator

Count the stitches in your swatch — get your gauge per 4 in, 10 cm and inch.

Yarn Cost Calculator

How many balls your project needs — and what it will cost.

Held Together Yarn Calculator

Holding strands together? See the yarn weight the combination knits or crochets up as.

Circular Yoke Calculator

Even yoke shaping rounds, knit or crochet — top-down increases or bottom-up decreases.

Yarn Weight from Gauge Calculator

Turn a stitch gauge into a yarn-weight category — lace to jumbo.

Rows from Length Calculator

Turn a length into a row count using your row gauge — inches or cm.

Stitches Per Needle Calculator

Split your stitches evenly across DPNs or magic-loop sections.

Short Row Calculator

Space short rows evenly for shoulder shaping, darts and heels.

Fringe Yarn Calculator

How much yarn to fringe a blanket, scarf or shawl — total and cut length.

Crochet Flat Circle Calculator

Round-by-round increases for a flat crochet circle from a magic ring.

Sweater Ease Calculator

Turn your chest measurement and desired fit into the size to knit.

Granny Square Blanket Calculator

How many granny squares (or motifs) to make a blanket of your size.

Amigurumi Sphere Calculator

The full round-by-round pattern for a crochet ball — every amigurumi shape starts here.

Long-Tail Cast-On Tail Calculator

How long a starting tail to leave for a long-tail cast-on — no more running short.

Neckline Shaping Calculator

Centre bind-off and edge decreases to shape a crew or V-neck.

Armhole Shaping Calculator

Underarm bind-off, a front-loaded taper and decreases to curve a set-in armhole.

Sleeve Cap Calculator

A starting framework for set-in sleeve cap decreases and bind-offs.

Sock Heel Calculator

Heel flap, turn and gusset numbers for a classic top-down sock.

Sock Toe Calculator

Wedge toe decrease rounds and Kitchener graft count, from your sock stitch count.

Yarn From Swatch Weight Calculator

Weigh your swatch and scale to the project — the most accurate yarn estimate.

Corner-to-Corner (C2C) Calculator

Increase, straight and decrease rows for a corner-to-corner blanket or graphghan.

Ribbing Calculator

Cast-on for a snug ribbed cuff, brim or hem that pulls in.