There is no universal starting-chain number for a baby blanket. The useful starting point is your stitch gauge: how many stitches fit across a measured section of fabric made with your yarn, hook and stitch.
If you are following a complete pattern at its stated size, use its foundation instructions. The method here helps you plan a custom width; it does not override a pattern’s repeat or border requirements.
Calculate the body stitch count
Target width × stitches counted ÷ measured swatch width = approximate stitches across. Keep the width units consistent. For example, 14 stitches measured over 4 inches gives 3.5 stitches per inch. A 30-inch-wide body therefore needs about 105 stitches.
Turn that count into a valid foundation
The answer above is a body stitch count, not automatically a chain count. Read how the designer defines a repeat. “Multiple of 3 plus 2 chains” is different from “a multiple of 3 stitches, plus turning chains”. Also check whether the turning chain counts as a stitch.
For a made-up arithmetic example, suppose the foundation must be 3n + 2 chains. Valid totals include 101, 104 and 107. A desired count near 105 does not make 105 a valid foundation for that rule. Choose a valid total, work the first rows and measure again.
For plain single crochet worked into the second chain from the hook, 106 foundation chains produce 105 single crochet stitches in the first row. This example applies to that construction only. Do not transfer it to shells, chevrons or a pattern with different edge rules.
Measure a useful swatch
- Use the actual yarn, hook and stitch intended for the blanket.
- Make the swatch wider than the area you want to measure.
- Wash and dry it using the intended care method.
- Measure across the middle, avoiding distorted edge stitches.
- Count stitches across that measured distance without stretching the fabric.
A chain stretches differently from finished rows, so measuring only the loose foundation is a weak sizing method. Make several rows before judging whether your width is right.
Separate the body from the border
If you want a 30-inch total width and a border that will add roughly one inch on each side, plan a body around 28 inches wide. Border depth is another measurement to check in a sample. Some decorative borders require specific counts on every edge.
For example, the Arcade Waffle planning guide explains why changing the body freely can disrupt the border. For a first blanket, following the designer’s stated size is simpler.
Common sizing problems
| Problem | Check first |
|---|---|
| Bottom edge pulls inward | Foundation tension compared with the rows |
| Blanket gets narrower | Stitch counts and missed edge stitches |
| Count is correct but width is wrong | Gauge with the chosen hook and yarn |
| Border ripples or cups | Border spacing, tension and corner instructions |
Once the width is settled, estimate the yarn with our yardage guide. For stitch notation, see the Craft Yarn Council’s pattern-reading reference.