Crochet Calculator
Two crochet helpers on one page: spread increases or decreases evenly over a row or round, or list every round of a flat circle with its stitch count.
1. Your swatch
2. Resize a pattern
3. Measurement to stitches
Your yarn (from the label)
Your swatch
Pieces of the project
Yarn used by a counted number of stitches
Stitches in the project
What the pattern asks for
How to use the crochet calculator
Increase or decrease evenly: enter the stitches in your last row or round and the stitches you need, choose Flat, in rows or In the round, and pick the stitch you are working (sc, hdc or dc, US terms). You get one line to follow, for example Round: (sc 5, inc) 6 times., plus a numbered list when the stretches are not all the same length.
Flat circle: enter the number of stitches your pattern puts in round 1 and the number of rounds. The table lists each round with its stitch count and what to work. If you would rather aim for a size, leave Rounds to work empty and fill in the height of one of your rounds and the width you want; the calculator estimates the rounds.
Print sheet prints the round table with a column to tick off as you go. For counting stitches as you crochet, the stitch counter keeps a row by row record, and the stitch calculator does the same evenly spacing for knitting.
The maths behind it
In crochet an increase (inc) is 2 stitches worked into one stitch, so it uses one stitch of the row below and makes two. A decrease (dec, for example sc2tog) works 2 stitches together, so it uses two and makes one. The calculator divides the remaining plain stitches as evenly as it can between the increases or decreases; in rows it keeps plain stitches at both ends.
A flat circle grows by the same number of stitches every round: the count from round 1. With 6 in round 1 you have 12 after round 2, 18 after round 3 and so on. Round 2 is an increase in every stitch, and each round after that puts one more plain stitch between the increases. The size estimate treats each round as adding one round height all the way around, so it is a guide, not a promise: measure as you go.
Keyboard shortcuts
- U or Ctrl+Z (outside a box): undo the last change
- R: clear all boxes (the message lets you undo it)
- C: copy the result
- P: print the result as a sheet
- Esc: leave the box you are typing in, so the letter keys work
- F: full screen, M: sound on or off
Inside a box, Tab moves to the next one and your browser's own undo works as usual.
Questions
Are these US or UK crochet terms?
US terms: sc is single crochet, hdc half double crochet and dc double crochet. In UK terms the same stitches are called double crochet, half treble and treble. The maths is the same either way.
My circle is turning into a hexagon. What can I change?
Keep the stitch counts from the table but move where the increases fall a little each round, for example by starting the round with half of the plain stitches. Stacking the increases in the same place every round is what makes the corners.
What should round 1 be?
Use the number your pattern gives. Taller stitches usually need more stitches in round 1 for the circle to lie flat, so check your pattern or make a small test circle.
Is my work saved?
Yes, the numbers stay in your browser after a refresh. Nothing is sent to a server.
More in Knitting and crochet
Put this crochet calculator on your website
Free for classrooms, clubs, blogs and shops: paste this code into any page. It works the same inside your site, and counts stay in each visitor's own browser. For a dark version, add ?theme=dark after /crochet-calculator/ in the code.