Crochet Blanket Calculator
Starting chain, row count, and total stitches for a blanket from size and gauge.
What it does
The first row of a blanket decides its width, and the number of rows decides its length. Getting the starting chain wrong is the most common way a blanket ends up too narrow, because the chain has to run the full width before any fabric exists. This calculator turns a target size and your gauge into the chain count and row count you actually need.
Gauge is measured on a small swatch, then scaled up. If four inches of your stitch pattern hold 16 stitches, then ten inches hold 40, and forty inches hold 160. The same logic applies to rows. Enter gauge the way patterns report it, as stitches and rows per 4 inches or 10 cm, and the tool does the scaling.
The chain count is the number of stitches across the first row, not the number of chain links you work before turning. Foundation chains, turning chains, and any pattern repeat adjustments sit outside this number. If your blanket is built from a stitch repeat, round the chain to the nearest multiple that the pattern allows and add or remove a few stitches.
Total stitches matter for yarn planning. A blanket that is 160 stitches wide and 270 rows deep holds about 43,200 stitches, and that figure scales directly with how much yarn you will pull through the hook. Compare two candidate sizes by total stitch count and you can estimate the extra yarn before buying it.
The default 40 by 60 inch size matches a common throw. Baby blankets usually run smaller, around 36 by 35 inches, and large adult blankets run past 60 by 49 inches. The table lists the standard sizes with the chain and row counts at a steady 4 stitches and 4.5 rows per inch.
Gauge drifts as you work. Borders stretch, stitches relax after washing, and different colors can work up at slightly different tensions. Treat the numbers as a target, measure the first few rows against the planned width, and adjust before you commit to the full length.
How to use
- Choose Imperial or Metric for the blanket size.
- Enter the finished width and length you want.
- Enter your stitch gauge and row gauge from a washed swatch.
- Read the starting chain and round it to fit any pattern repeat.
- Read the row count and total stitches.
- Measure the first rows and adjust the hook or gauge if the width drifts.
Formula
- width
- Finished blanket width in inches or centimeters.
- length
- Finished blanket length in inches or centimeters.
- stitch gauge
- Stitches across one gauge span, usually 4 inches or 10 cm.
- row gauge
- Rows in one gauge span.
- span
- 4 for inches, 10 for centimeters.
The span is 4 inches in imperial and 10 centimeters in metric because that is how patterns state gauge. Both modes produce the same chain and row counts for the same physical blanket. Rounding lands on whole stitches, and pattern repeats may push the final chain slightly up or down.
Worked example
Example: 40 by 60 inch throw at 16 stitches and 18 rows per 4 inches
Imperial defaults: 40 in wide, 60 in long, 16 stitches and 18 rows per 4 in.
- Chain: 40 x 16 / 4 = 160 stitches.
- Rows: 60 x 18 / 4 = 270 rows.
- Total: 160 x 270 = 43,200 stitches.
- Check width after 3 rows by measuring against 40 in.
- Adjust hook size if the fabric runs wide or narrow.
- Tool shows 160 chains, 270 rows, and 43,200 stitches.
Reference table
| Blanket | Size | Chain | Rows | Stitches |
|---|---|---|---|---|
| Baby | 36 x 35 in | 144 | 158 | 22,752 |
| Lap | 45 x 35 in | 180 | 158 | 28,440 |
| Child | 54 x 42 in | 216 | 189 | 40,824 |
| Adult | 63 x 49 in | 252 | 221 | 55,692 |
Limits
- Assumes a single stitch pattern with a steady gauge across the whole blanket.
- Does not include borders, turning chains, or pattern repeat adjustments.
- Round or ripple patterns change the effective width of the first row.
- Gauge measured before washing can shift after blocking.
Common mistakes
- Skipping the swatch and trusting the hook size on the yarn label.
- Counting the turning chain as a working stitch and ending one stitch short.
- Stretching the chain when measuring, which hides a too tight foundation.
- Changing colors mid blanket without checking that the new yarn matches the gauge.
- Planning yarn from the finished size instead of the total stitch count.
Try it yourself
Quick checks. Answers sit tucked under each question.
Baby blanket, 36 by 35 inches. What are the counts?
144 chains, 158 rows, and 22,752 stitches.
Adult blanket, 63 by 49 inches. What are the counts?
252 chains, 221 rows, and 55,692 stitches.
Lap blanket in metric, 114 by 89 cm. What are the counts?
182 chains, 160 rows, and 29,120 stitches at 16 stitches and 18 rows per 10 cm.
Questions
How many chains do I need for a blanket?
Multiply the finished width by your stitch gauge and divide by the gauge span. A 40 inch blanket at 16 stitches per 4 inches needs 160 chains before any pattern repeat adjustment.
Do I count the turning chain in the starting chain?
The starting chain is the foundation row. Turning chains are worked from it and are not part of the width count, though many patterns fold them into the first row in different ways.
Why does my blanket get wider as I work?
Extra stitches at the edges, usually from an extra chain at the turn or from putting two stitches into the first and last stitch. Count every few rows until the habit sticks.
How much yarn will a 43,200 stitch blanket use?
Stitch count drives yardage. A single crochet uses less yarn per stitch than a double crochet, so weigh a 10 by 10 swatch, estimate its stitch count, and scale up to the total.
Should I add stitches for the border?
Borders sit outside the calculated size. If you plan a wide border, make the body slightly narrower so the finished blanket matches the target.
Is the metric mode different?
No, it is the same blanket described in centimeters. Gauge is entered per 10 cm in metric and per 4 inches in imperial, and the chain and row counts come out identical.
Sources
- Craft Yarn Council: blanket sizing standards for crochet and knit
- Craft Yarn Council: knit and crochet gauge and sizing brochure