Boneyard Tools

Increase and Decrease Calculator for Even Shaping

When a pattern says to increase or decrease evenly across a row, this tool does the arithmetic for you. Enter the stitches you have now and the stitches you want, and it returns the change count, the interval to work between shaping points, and a ready-to-follow instruction. The interval is the current stitch count divided by the change count and rounded down, with any leftover stitches worked plain at the end.

How to space increases or decreases evenly

  1. Enter the number in the Current stitches field, the count on your needle or hook now.
  2. Enter the number in the Target stitches field, the count you want after the shaping row.
  3. Read the Mode, Change and Interval tiles to see whether you increase or decrease and by how many.
  4. Follow the instruction line, then use Copy result to save it with your pattern notes.

Examples

Increase 60 up to 80 stitches

Current 60, target 80
Increase, change 20, interval 3: work 3, make 1; repeat 20 times

Decrease 100 down to 90 stitches

Current 100, target 90
Decrease, change 10, interval 10: work 8, work 2 together; repeat 10 times

Increase that leaves a remainder

Current 44, target 50
Interval 7: work 7, make 1; repeat 6 times, then work the last 2 plain

Frequently asked questions

How do I increase evenly across a row?

Subtract your current stitches from the target to get the change count, then divide the current count by that change and round down for the interval. Work that many stitches, make one, and repeat across the row, working any remainder plain at the end.

What exactly does the interval number mean?

The interval is how many stitches to work before each shaping point. For increases you work the full interval then make one. For decreases the tool works two of those stitches together, so the plain stitches you work first are the interval minus two.

Why does 44 to 50 stitches leave a remainder?

Stitch counts rarely divide cleanly. For 44 to 50 the change is 6 and the interval floors to 7, which uses 42 stitches over six repeats. The leftover 2 stitches are reported as a remainder to work plain so the increases stay spread across the row.

Does the tool work for both knitting and crochet?

Yes. The spacing math is identical for both crafts. Read make 1 as your preferred increase, such as a knit front and back or a lifted increase, and read work 2 together as your chosen decrease like k2tog or sc2tog.

What happens if the current and target are the same?

The tool reports the Mode as No change with a change count of zero and tells you no shaping is needed, since you already have the right number of stitches.

Is the spacing perfectly symmetric?

It is evenly distributed rather than mirror symmetric. Many patterns nudge a stitch or two at the edges for a tidy selvedge, so feel free to shorten the first or last plain segment if you want the borders to match.

Can I use decimals or must counts be whole numbers?

Use whole stitch counts, since you cannot work a partial stitch. Both fields must be greater than zero, and the interval is always rounded down to keep the shaping points on real stitches.

How do I copy the instructions into my pattern?

Press Copy result and the tool copies a short summary with the mode, change count, interval and the full instruction line, ready to paste into your project notes or a row-by-row plan.

Is anything I enter uploaded?

No. The calculation runs entirely in your browser, so your stitch counts never leave your device and nothing is stored on a server.

Learn more

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