Calculate knitting crown decreases by finding stitches on needle, rows to decrease over, decreases per row, or remaining stitches from 3 values.
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Crown Decrease Formula
The crown decrease calculation is based on the number of stitches removed across a set number of rows or rounds.
To solve for the other fields, the same formula is rearranged:
- S = stitches on needle before the crown decreases start
- R = rows or rounds with decreases; plain rows are additional
- D = decreases per row
- RS = remaining stitches after the decreases are complete
Select the quantity to solve for, then enter the other three values. The model uses a constant number of stitches removed on each decrease row or round. It does not include any intervening plain rows.
For knitting in the round, treat each round as one row. A decrease such as k2tog usually removes 1 stitch, so 8 k2tog decreases in one round means 8 decreases per row.
Common Crown Decrease Counts
These illustrative counts divide into the sections shown. Hat size also depends on gauge and pattern; the listed uses are examples.
| Stitches on needle | Common decreases per round | Approximate sections | Typical use |
|---|---|---|---|
| 72 | 6 or 8 | 6 sections of 12 or 8 sections of 9 | Small hat or fitted beanie |
| 80 | 8 or 10 | 8 sections of 10 or 10 sections of 8 | Average adult beanie |
| 96 | 8 or 12 | 8 sections of 12 or 12 sections of 8 | Larger hat or finer gauge |
How to Read the Result
| Result type | What it means | What to do |
|---|---|---|
| Whole number | The decrease plan divides evenly. | You can usually follow the result directly. |
| Decimal number | The decreases do not divide evenly across the rows. | Adjust the row count, decrease count, or final stitch count. |
| Plan removes too many stitches | Too many stitches are being decreased. | Use fewer rows, fewer decreases per row, or a higher starting stitch count. |
Example Crown Decrease Calculations
Example 1: Find remaining stitches
You have 80 stitches on the needle. You decrease over 8 rows, with 8 decreases per row.
You will have 16 remaining stitches.
Example 2: Find decreases per row
You start with 96 stitches and want to end with 12 stitches after 7 rows.
You need 12 decreases per row.
Crown Decrease Calculator FAQ
What counts as one decrease?
One decrease is one stitch removed from the total stitch count. For example, k2tog and ssk each usually reduce the stitch count by 1. If you work 8 k2tog stitches in one round, that counts as 8 decreases for that round.
Can I use this for rounds instead of rows?
Yes. If you are knitting a hat in the round, enter rounds as rows. For example, if you plan to decrease over 10 rounds, enter 10 for rows to decrease over.
What if the calculator gives a decimal result?
A decimal result means the numbers do not divide evenly. Since you cannot usually work part of a stitch decrease, adjust one of the inputs. Common fixes are changing the number of decrease rows, changing the decreases per row, or choosing a different final stitch count.
