blanketmath

LESS MATH. MORE MAKING.

Crochet blanket calculator

Find the stitches and rows for your next blanket.
Just add your size and a few swatch measurements.

✓ Free to use✓ No sign-up✓ Inches or cm

1 Your blanket

Measurement units

Enter the size of the crocheted rectangle, without a border.

2 Your swatch

What’s a swatch?

Count stitches across and rows down a measured section of your crochet.

Pattern repeats & starting chains Optional

For the working stitches in each row. Leave at 1 and 0 for a plain rectangle. A foundation-chain repeat may differ from a working-stitch repeat.

Only enter this if your pattern gives starting chains = working stitches + extra chains. Count skipped / turning chains once. Otherwise, we’ll show working stitches only.

Estimate yarn needed Optional

Weigh a rectangular sample made in the same stitch, yarn and hook. Measure the whole sample you weighed.

The allowance adds spare yarn for small variations and ends. A border needs its own estimate. Skeins must be the same yarn as your sample.

FROM SWATCH TO SOFA

Three small steps. One blanket plan.

01

Pick your size

Choose a common blanket size or enter your own width and length. Presets are starting points—make it your size.

02

Measure a swatch

Crochet a sample using your project’s yarn, hook and stitch. Wash and dry it as you intend to treat the blanket. Count stitches and rows in a measured interior section.

03

Get your numbers

We turn your gauge into working stitches and rows. Add your pattern’s repeat if needed, then use the counts with your own pattern.

THE SIMPLE MATH

How many stitches do I need?

Divide your swatch’s stitch count by its measured width. Multiply that by the width you want your blanket to be.

Stitches per inch × blanket width
= working stitches

For example, 16 stitches across 4 inches gives 4 stitches per inch. A 50-inch-wide blanket needs 200 working stitches. At 12 rows per 4 inches, a 60-inch length needs 180 rows.

If you enter a stitch repeat, we choose the closest valid count with at least one repeat. We round rows to the nearest whole row and show the resulting size. Pattern row repeats are not adjusted automatically.

A FEW USEFUL ANSWERS

Before you start

How many chains do I need for a blanket?

It depends on your gauge, blanket width and first-row instructions. Working stitches and starting chains are not always the same. Enter your pattern’s extra foundation chains in the optional settings if you know its rule; otherwise, follow the pattern to convert the working stitch count.

Can I use this without making a swatch?

You can enter the gauge printed in a pattern for a rough starting point, but your tension may differ. A sample made with your actual hook, yarn and stitch gives a more useful estimate. Measuring a loose chain is not a substitute for measuring crocheted fabric.

How much yarn do I need?

Open “Estimate yarn needed” and enter the full dimensions and weight of a sample. We multiply its grams per square inch (or square centimeter) by the calculated blanket area, add your allowance, and round up to whole skeins. Borders and different stitch sections need separate estimates.

Does it include a border?

No. Enter the dimensions of the main rectangle only. If you want a 50-inch width with a 2-inch border on each side, enter 46 inches. Estimate the border’s yarn separately.

Can I use it for granny squares or C2C?

This calculator is for flat rectangles worked in rows. Granny squares, corner-to-corner blankets, circles and shaped patterns need different calculations.

Are blanket sizes standard?

There is no single standard. The presets are convenient examples. Measure a blanket you like, or measure the bed and add the amount of drape you want.