Less guessing. More making.

Crochet yarn
calculator

Your stitches are unique. Estimate yarn for your next rectangular blanket using a small swatch you actually made.

Measured swatch methodNo account or uploadGrams · yards · skeins
A small swatch scales into a rectangular blanketWeigh and measure your swatch, then scale its yarn weight by the target blanket's area.Measured swatchScale by areaTarget height
A real sample is more useful than a generic yarn chart.

Start with your swatch

Use the same yarn, stitch, hook and tension as your blanket.

1Your measured swatch
2Your rectangular blanket
0–50%

10% is a starting assumption you can change, not a guarantee. Add borders and joins separately.

3Skein label optional

Enter weight to get whole skeins; enter both weight and length to get yards and meters.

The method

A small sample. A clearer plan.

1

Make representative fabric

Use your planned stitch, hook and yarn. Finish and dry the sample the same way you intend to finish the blanket.

2

Measure and weigh it

Measure the whole piece whose yarn weight you weigh, without pulling it out of shape. Tiny samples amplify scale and ruler errors.

3

Scale, then add allowance

The calculator scales grams by rectangular area. Add a deliberate allowance, then use your label to round up whole skeins.

Read the formula, worked example and limitations →

Before you buy yarn

Can I use this for any crochet project?

The area method suits a rectangular blanket with repeating fabric. It does not model fitted garments, circular pieces, amigurumi, shaping, changing stitches or separately worked borders. Use the actual pattern's information for those.

How does the crochet yarn calculator work?

It divides the swatch weight by its area, multiplies by your target blanket area, and adds your chosen allowance. It then uses your skein label, if supplied, to convert weight into length and whole skeins.

What if I do not have a swatch?

This tool deliberately needs a measured swatch instead of inventing a typical quantity. Your pattern may supply yarn quantities, but a generic estimate will not account for your exact stitch and tension.

Does the allowance include a border?

Not automatically. Estimate a border or join separately if it differs from the main fabric. A chosen percentage is a planning assumption, not a model of that border.