Foundation Chain Crochet: How Many Chains Do I Start With?
The starting chain is the base your whole flat piece is built on — get its count right and every row after it lines up.
What a foundation chain is
A foundation chain is the row of chain stitches you make first, before any other stitch — the base your whole flat crochet piece is built on. Every stitch of Row 1 is worked into one of these starting chains, so the number you make sets how wide the finished fabric will be. It is sometimes called the starting chain or the base chain, and in a chart it is the straight row of chain ovals along the bottom edge (see how to read a crochet chart). A piece worked in the round starts from a ring instead — a magic ring or a small ring of chains.
How to count your chains
Count each V-shaped loop along the front of the chain, starting after the slip knot and stopping before the loop still on your hook. Neither the slip knot nor the loop on the hook counts as a chain — the two most common reasons a starting chain ends up one or two stitches off. Lay the chain flat with the front facing you (a neat row of little Vs) and count the Vs; the bumps on the back are the same chains seen from behind, so count one side only. If the chain is long, drop a stitch marker every 20 chains as you go so you never have to recount the whole thing.
How many chains do I need? The formula
Chains = (finished width in inches × your gauge in stitches per inch) + a turning-chain allowance. The width times your gauge gives the number of stitches in a row; the allowance is the little extra the turning chain needs at the edge — + 1 for single crochet and + 2 for double crochet (why they differ is in the turning-chain section below).
Worked example. For a 30-inch baby blanket in single crochet with worsted-weight yarn, gauge is about 4 stitches per inch (hook H-8, 5 mm). So you need 30 × 4 = 120 single crochet, and you start with Ch 121 (120 + 1). Always crochet a small gauge swatch first — your own tension decides the stitches-per-inch, and a half-stitch difference over a blanket is several inches.
Crochet blanket & scarf chain size chart
These are typical finished widths and the single-crochet starting chain each needs at common gauges. Read down to your project, across to your yarn weight. Every chain count is width × gauge + 1; adjust the width to your own pattern and always swatch to confirm your gauge.
| Project | Typical width | DK (5/in) | Worsted (4/in) | Bulky (3/in) |
|---|---|---|---|---|
| Scarf | 6″ | Ch 31 | Ch 25 | Ch 19 |
| Baby blanket | 30″ | Ch 151 | Ch 121 | Ch 91 |
| Throw / lapghan | 50″ | Ch 251 | Ch 201 | Ch 151 |
| Twin blanket | 66″ | Ch 331 | Ch 265 | Ch 199 |
Working in double crochet instead? Double crochet is taller and wider, so you'll need fewer stitches for the same width — recount at your dc gauge and add 2 for the turning chain.
Count it for your size: foundation chain calculator
Enter a finished width and your yarn, and this counts the starting chain for you — for plain single crochet, or for filet mesh with the stitch multiple already honoured.
The builder counts the chains for you and checks the stitch repeat fits.
Why patterns say “chain a multiple”
A stitch pattern repeats over a fixed number of stitches, so the starting chain has to divide evenly into that repeat — plus a few edge and turning chains. That is what “chain a multiple of 3 + 1” means: 3 chains for every repeat, then 1 more for the edge. If the chain is not a clean multiple, the last repeat runs short and the pattern breaks at the end of the row.
Filet crochet is the clearest example. Each filet mesh cell is 3 stitches wide, so a panel of W cells needs 3 × W chains, plus a rise for the first row: + 3 when Row 1 starts on a filled block and + 5 when it starts on an open space. A 60-cell mesh panel that starts on a space is therefore 3 × 60 + 5 = Ch 185. The filet crochet guide walks through reading and working a mesh chart from that foundation.
Turning chains and the foundation
The turning-chain allowance differs by stitch because taller stitches need a taller chain to reach their height at the edge of a row. For single crochet the turning chain is 1 chain and does not count as a stitch, so you add 1 to the foundation. For double crochet the turning chain is 3 chains and counts as the first stitch, which nets an extra 2 chains on the foundation. Half double sits in between. This is why the same width starts with a different chain count depending on the stitch — the fabric is the same width, but the edge geometry is not.
Chainless foundations (foundation single crochet)
A chainless foundation makes the starting chain and the first row of stitches at the same time, in one pass. Foundation single crochet (fsc) and foundation double crochet (fdc) replace the “chain, then work back across” two-step with a single row that lays down a chain and a stitch together. Crocheters reach for them for a stretchier, less rigid edge — handy on garments, hat brims and blanket starts — and to sidestep miscounting or splitting a tight starting chain. The trade-off is that fsc has its own rhythm to learn and can be looser, so many patterns still specify a plain chain for a firm, predictable edge. Both give the same stitch count; a pattern written for “Ch 121” can start with 120 fsc instead if you prefer the stretch.
Get the count exact with the Pattern Builder
The surest way to start a flat piece on the right chain is to give a tool your size and gauge and let it count. CrochetPop's Pattern Builder turns a width in inches or centimetres into a foundation chain — honouring the stitch multiple — then generates the full row-by-row pattern and symbol chart to work from. Patterns are produced by deterministic algorithms and machine-validated for stitch-count accuracy — never written by a language model: each row's stitch count is checked against the row below it, the same arithmetic a human tech editor verifies by hand.