Crochet Border Stitch Calculator
A 100 × 120 cm blanket has a perimeter of 2 × (100 + 120) = 440 cm. At 16 stitches per 10 cm that is 704 stitches, plus 2 at each of the four corners, so you work 712 in the first round. Leave the corner stitches out and the border pulls in at the corners until the blanket looks pentagonal — single crochet borders usually want 2–3 stitches per corner, double crochet ones a chain-2 plus a 5-stitch cluster.
Your numbers
Border stitches
712sts
Perimeter
440cm
Corner stitches
8sts
Formula
Perimeter = 2 × (Finished width + Finished length), Border stitches = Perimeter × Stitches per 10 cm ÷ 10 + 4 × Extra stitches per corner
The top and bottom edges are counted differently from the sides. Along the top you put one stitch in each stitch head, but the sides are row ends, and no gauge tells you how many fit there: roughly 2 into the side of a double crochet row, 1 into a single crochet row. Treat this figure as the target you correct towards while working the first round. A patterned edging — shells, picots — has to come out on a multiple of its repeat, so round 712 up to that multiple and absorb the difference at the corners.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Finished width (cm)The width when finished, before any seam or fold allowance. | 100 | 0 and up |
| Finished length (cm)The length when finished. | 120 | 0 and up |
| Stitches per 10 cm (sts/10 cm)Stitches in 10 cm. If you measured over 5 cm, double it before entering. | 16 | 0 and up |
| Extra stitches per corner (sts)Extra stitches at one corner — 2–3 in single crochet, a cluster in double. | 2 | 0 ~ 6 |
Step by step
Quick reference table
Results when only Finished width (cm) changes and everything else stays put.
| Finished width (cm) | Border stitches (sts) | Perimeter (cm) | Corner stitches (sts) |
|---|---|---|---|
| 50 | 552 | 340 | 8 |
| 75 | 632 | 390 | 8 |
| 100 | 712 | 440 | 8 |
| 150 | 872 | 540 | 8 |
| 200 | 1,032 | 640 | 8 |
What each result means
| Result | At default values |
|---|---|
| Border stitches (sts)Stitches for the first round of the border, corners included. | 712 |
| Perimeter (cm)The total length around the outside of a shape. | 440 |
| Corner stitches (sts)Extra stitches at the four corners together; without them the border pulls in. | 8 |
Common mistakes
The top and bottom edges are counted differently from the sides. Along the top you put one stitch in each stitch head, but the sides are row ends, and no gauge tells you how many fit there: roughly 2 into the side of a double crochet row, 1 into a single crochet row. Treat this figure as the target you correct towards while working the first round. A patterned edging — shells, picots — has to come out on a multiple of its repeat, so round 712 up to that multiple and absorb the difference at the corners.
Glossary
- Finished width
- The width when finished, before any seam or fold allowance.
- Finished length
- The length when finished.
- Stitches per 10 cm
- Stitches in 10 cm. If you measured over 5 cm, double it before entering.
- Extra stitches per corner
- Extra stitches at one corner — 2–3 in single crochet, a cluster in double.
- Border stitches
- Stitches for the first round of the border, corners included.
- Perimeter
- The total length around the outside of a shape.
- Corner stitches
- Extra stitches at the four corners together; without them the border pulls in.
Frequently asked questions
Q. How is Crochet Border Stitch Calculator calculated?
Perimeter = 2 × (Finished width + Finished length), Border stitches = Perimeter × Stitches per 10 cm ÷ 10 + 4 × Extra stitches per corner — A 100 × 120 cm blanket has a perimeter of 2 × (100 + 120) = 440 cm. At 16 stitches per 10 cm that is 704 stitches, plus 2 at each of the four corners, so you work 712 in the first round. Leave the corner stitches out and the border pulls in at the corners until the blanket looks pentagonal — single crochet borders usually want 2–3 stitches per corner, double crochet ones a chain-2 plus a 5-stitch cluster.
Q. Can you walk through an example?
With Finished width 100cm, Finished length 120cm, Stitches per 10 cm 16sts/10 cm, Extra stitches per corner 2sts, the answer is Border stitches 712sts.
Q. What do I need to enter?
Enter Finished width, Finished length, Stitches per 10 cm, Extra stitches per corner. The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Finished width (cm) moves the answer to Finished width (cm) 50 → Border stitches (sts) 552 and Finished width (cm) 200 → Border stitches (sts) 1,032. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
The top and bottom edges are counted differently from the sides. Along the top you put one stitch in each stitch head, but the sides are row ends, and no gauge tells you how many fit there: roughly 2 into the side of a double crochet row, 1 into a single crochet row. Treat this figure as the target you correct towards while working the first round. A patterned edging — shells, picots — has to come out on a multiple of its repeat, so round 712 up to that multiple and absorb the difference at the corners.
Related calculators
Materials differ in density and absorption. If your label states a figure, use it — the defaults here are only common values.