Origami Paper Size Calculator

Find the starting square size you need for a target finished origami model, from built-in model ratios or your own test fold.

Buying the right amount before starting: how many skeins a jumper needs, how much wax fills the moulds you own, how much resin a bezel takes, how much fabric a quilt binding eats.

Sizing from the pattern's yarn rather than your own. Two yarns sold as the same weight can differ by a fifth in metres per hundred grams, and a hook or needle size converted between systems is a nominal diameter, not a promise about gauge — knit a swatch.

They sit next to each other but answer different questions: Crochet Hook Size Converter is the one to open when you need it to convert crochet hook sizes between metric (mm), US and UK, with a full reference table. Pick whichever matches what you're starting from — both are free.

Cross-Stitch Size Calculator is the closest one after this: Finished design size from stitch count and fabric count, in inches and cm, with an optional margin.

Knitting Needle Size Converter and Rock Paper Scissors Generator — they come up in the same task often enough to be worth a second tab.

Hook and needle equivalences follow the Craft Yarn Council's metric table; the soap calculator uses published saponification values, which vary by oil batch, so the lye figure is a starting point that a superfat margin is meant to absorb.