One of the questions I see come up again and again in crochet is:
“How much yarn do I need?”
For a blanket. For a bag. For a sweater. For a project you’re making up as you go.
And the frustrating answer is usually:
“Well… it depends.”
Two projects that look almost the same can end up using very different amounts of yarn. A textured tote bag might use more yarn than a larger scarf, dense stitches can behave completely differently from lace stitches, and even changing your hook size can affect the result.
I kept noticing this while designing my own patterns too. A lot of the information out there comes from general yarn charts, and sometimes even knitting-based estimates, but crochet fabric can behave very differently.
So I designed a Yarn Calculator using information from real swatches and research across many crochet projects and patterns to give a more useful starting estimate.
It won’t predict an exact number before you’ve picked up your hook, but it can help take a lot of the guesswork out of planning a project.
→ Try the Yarn Calculator here
How to use the Yarn Calculator
Step 1: Choose your project type
Start by selecting what you’re making.
Options include projects such as:
- Blankets
- Bags
- Rugs
- Garments
- Scarves
- Shawls
- Accessories
For garments, you can also choose standard sizing options rather than entering every measurement manually.
Step 2: Choose a size or enter custom dimensions
Many project categories include pre-made size options to make planning easier.
For example, you may be able to select standard sizes for:
- Garments
- Blankets
- Bags
- Accessories
If you’re designing something custom, you can also enter your own measurements.
Step 3: Select your yarn weight
Choose the yarn weight you plan to use for your project.
Different yarn weights create different stitch sizes and can significantly affect the final yarn estimate.
Step 4: Choose your stitch type
This step matters more than many people expect.
Different stitches can use surprisingly different amounts of yarn.
Open stitches
Examples:
- Mesh stitches
- Lace patterns
- Granny-style fabrics
These often use less yarn because they contain more open space.
Medium density stitches
Examples:
- Simple stitch patterns
- Standard crochet fabrics
Dense or textured stitches
Examples:
- Puff stitches
- Bobbles
- Tapestry crochet
- Structured bag fabrics
These usually use more yarn because more yarn is packed into the same space.
A blanket made with mesh stitches and a blanket made with puff stitches could end up using very different amounts of yarn even at exactly the same size.
Step 5: Get your estimate
The calculator gives a practical estimate to help you plan before buying yarn.
It’s especially useful when:
- Substituting yarn
- Designing your own project
- Planning stash projects
- Deciding how much yarn to buy
Ready to estimate your next project?
→ Try the Yarn Calculator here
One thing I also wanted to account for was that not all projects use the same kinds of yarn. For bags and rugs especially, I used more specialised yarns that are commonly used for those projects rather than treating everything like standard crochet yarn. Structured bags often use materials such as t-shirt yarn, raffia or sturdier fibers, and rugs behave differently again. The estimates in the Yarn Calculator are based on real swatches I made and measured, so they’re built around actual crochet fabric rather than generic averages alone.
But every crocheter is a little different too. We all crochet with slightly different tension, use different yarns and hooks, and even the same stitch can behave differently from one person to another. That’s why if you’d like an even more personalized estimate based on your own crochet fabric, you can take things a step further with the Project Planner.
Want an even more personalized estimate?
The Yarn Calculator gives a researched estimate based on project type and stitch behavior.
If you’d like something based on your own crochet fabric, try the Swatch Project Planner.
Instead of using general estimates, it uses information from your own swatch, including:
✓ Gauge
✓ Yarn usage
✓ Fabric density
✓ Sizing information
A swatch can actually tell you much more than most people expect.
