Crochet Blanket Calculator
Every standard blanket size, the starting chain that gets you there at your gauge, the rows to work, and the border rounds to finish — the whole blanket plan on one page.
1 · Standard blanket sizes
| Blanket | Inches | Centimeters | Made for |
|---|---|---|---|
| Baby | 30 × 36 in | 76 × 91 cm | crib & stroller |
| ✓ Throw | 50 × 60 in | 127 × 152 cm | couch classic |
| Twin | 66 × 90 in | 168 × 229 cm | single bed |
| Full / Double | 80 × 90 in | 203 × 229 cm | double bed |
| Queen | 90 × 90 in | 229 × 229 cm | queen bed |
| King | 108 × 90 in | 274 × 229 cm | king bed |
| Custom | tap here, then enter your own width and length below | ||
Tap a row to use that size below. Sizes are common finished measurements — add drape (8–12 in per side) if you want the blanket to hang over the mattress.
2 · Starting chain & row count
Using Throw: 50 × 60 in (127 × 152 cm)
Foundation chain
176
175 sts + 1 turning ch
Rows (from your gauge)
225
for 60 in long
Rows (stitch-height est.)
≈ 152
sc ≈ 1 cm/row, worsted
Don't know your gauge? Swatch 20 chains and measure — or use the Crochet Stitch Calculator to do this math from your swatch.
3 · Border rounds
Border rounds
≈ 4
sc rounds ≈ 1 cm each
Perimeter
220 in
559 cm around a 50×60 in blanket
Work 3 stitches into each corner on round 1 so the border lies flat. For yarn amounts, head to the Yarn Calculator — it estimates yardage for the whole blanket, border included.
All math runs in your browser — nothing is uploaded. Row counts from stitch height are worsted-weight averages; your swatch always wins. 💕
Keep planning: how much yarn you'll need · granny square version · track your rows
Blanket math is a chain of small multiplications that all have to agree: how big is the blanket, how many chains start it, how many rows finish it, how many rounds edge it. This crochet blanket calculator keeps the whole chain on one page. Tap a standard size — baby, throw, twin, full, queen, king, in both inches and centimeters — and the rest of the page sizes itself to it.
Enter your gauge and stitch and it hands back the foundation chain (turning chain included, rounded to your stitch repeat), the row count from your row gauge plus a stitch-height estimate for before the swatch exists, and the border rounds for the edging width you want. For yarn amounts it defers to the dedicated yarn calculator — no duplicated guessing.
What you get
Standard size chart, tappable
Baby through king in inches and centimeters — tap a row and the whole page plans for that blanket.
Starting chains from your gauge
Stitches per 4 in × blanket width = foundation chain, turning chain added automatically for sc, hdc, dc, or tr.
Stitch-multiple aware
Working a ripple or shell repeat? Set the multiple and the chain rounds up to a whole number of repeats.
Row counts two ways
From your row gauge when you have a swatch, or from stitch-height averages (sc ≈ 1.0 cm/row up to tr ≈ 2.0) when you don't.
Border round estimates
Desired border width → rounds needed, plus the blanket's perimeter so you know what you're signing up for.
Free, private, no sign-up
All math runs in your browser — nothing is uploaded, nothing is tracked.
How to plan a crochet blanket
Pick a size
Tap a row in the size chart — baby through king — or choose Custom and enter your own width and length. Add drape allowance if the blanket should hang over a mattress.
Enter your gauge and stitch
From a 4-inch swatch: stitches across and rows up. Choose your stitch so the turning chain is right, and set a stitch multiple if your pattern repeats.
Chain, work the rows, plan the border
Start from the foundation chain shown, work the row count, then set your border width to get the rounds. Take the blanket's dimensions to the yarn calculator for yardage.
Calculator vs. chain-and-hope
| Blanket calculator | Chaining until it looks right | |
|---|---|---|
| Foundation chain | Computed from your gauge, turning chain and stitch repeat included | Chain 200, hold it against the couch, frog, repeat |
| Row count | From your row gauge — or stitch-height estimates pre-swatch | You stop when it feels long enough, then it shrinks in the wash |
| Sizing | Six standard sizes in inches and cm, one tap to switch | A screenshot of someone's size chart from 2019 |
| The border | Rounds planned from the width you want, corners explained | Discovered as a concept at 11 pm on finishing night |
Frequently asked questions
How many chains do I need for a crochet blanket?
Multiply your stitches-per-inch by the blanket width, then add the turning chain for your stitch. At 3.5 sc per inch, a 50-inch throw needs 175 sc — so chain 176 (one turning chain for sc; add 2 for hdc, 3 for dc, 4 for tr). The calculator above does this from your gauge and rounds to your stitch pattern's multiple automatically.
What are the standard crochet blanket sizes?
Baby: 30×36 in (76×91 cm). Throw: 50×60 in (127×152 cm). Twin: 66×90 in (168×229 cm). Full/Double: 80×90 in (203×229 cm). Queen: 90×90 in (229×229 cm). King: 108×90 in (274×229 cm). These cover the mattress top — add 8–12 inches per side if you want the blanket to drape over the edges.
How many rows does a crochet blanket take?
Divide the length by your row height. In worsted weight, single crochet runs about 1.0 cm per row — so a 60-inch (152 cm) throw takes roughly 150 rows; double crochet at 1.7 cm per row takes about 90. Your tension shifts these numbers, which is why the calculator shows both your row-gauge count and the stitch-height estimate.
How many rounds should a blanket border be?
A typical border runs 1–2 inches: that's about 3–5 rounds of single crochet or 2–3 of double crochet. Work three stitches into each corner on the first round so the border lies flat. The border section above converts any border width into rounds for your chosen stitch.
How much yarn do I need for a crochet blanket?
In worsted: roughly 1,100 yards for a baby blanket, 3,000 for a throw, 6,500 for a queen — crochet uses about 25–30% more yarn than knitting the same size. For a proper estimate by project or from your actual chart, use the Yarn Calculator linked above; this page deliberately doesn't duplicate it.
Is this crochet blanket calculator free?
Yes — free with no sign-up, and it runs entirely in your browser. Your gauge and measurements never leave your device.