How much yarn do I need to knit a blanket?
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If you’re thinking about making a blanket, one of the first questions that comes up is how much yarn you’ll need. The answer depends on the type of yarn, its weight, the stitch you choose, and the blanket’s final size. In this article, we’ll help you calculate it easily so you don’t run out of yarn (or end up with far too much).
Factors that affect the amount of yarn
Before looking at the approximate quantities, keep in mind that every blanket is unique. These are the main factors that affect yarn consumption:
1. Blanket size
A small blanket for the sofa isn’t the same as a bedspread. As the size increases, you’ll need more balls of yarn.
2. Yarn weight
Thicker yarns (Bulky, Super Bulky...) cover more surface with fewer stitches. In contrast, fine yarns (Fingering, Sport, DK…) require more yards of yarn for the same size.
3. Stitch or fabric type
Some stitches “use” more yarn than others.
For example:
- Garter stitch or popcorn stitch: denser → more yarn.
- Stockinette stitch or openwork stitches: lighter → less yarn.
4. Needles or crochet hook
The larger the needles or crochet hook, the looser the fabric will be, and the less yarn you’ll use.
Approximate quantities by yarn type
Below, we’ve put together a practical guide to the amount of yarn needed to knit or crochet a blanket, based on the type of yarn and size you choose 👇
Knitting and crochet don’t use the same amount of fiber. Crochet uses between 20% and 30% more yarn than knitting, as each stitch creates a tighter, denser structure. That’s why, at Idealium, we’ve prepared different quantity charts depending on whether you’re knitting or crocheting. Make sure you consult the right chart for your project.
Before you start: how to determine your yarn weight
The tables have been calculated from the international yarn weight categories. If you already have the ball of yarn but don’t know which international yarn weight category (CYC) it belongs to, you can easily find out by looking at the gauge swatch shown on its label.
Each manufacturer indicates on the label how many stitches and rows are obtained in a 10 x 10 cm square 10×10 cm with the recommended needles. Based on these numbers, you can identify its category in the following table:
| Category weight |
International name | Approximate gauge (10x10 cm) |
Needle crochet |
Needles knitting |
| 0 | Lace | +32 sts | 1.5 – 2.25 mm | 1.5 – 2.25 mm |
| 1 | Super Fine (Fingering, Sock) | 27 – 32 sts | 2.25 – 3.5 mm | 2.25 – 3.25 mm |
| 2 | Fine (Sport, Baby) | 23 – 26 sts | 2.75 – 3.5 mm | 3.25 – 3.75 mm |
| 3 | Light (DK, Light Worsted) | 21 – 24 sts | 3.5 – 4.5 mm | 3.75 – 4.5 mm |
| 4 | Medium (Worsted, Aran) | 16 – 20 sts | 5 – 6 mm | 4.5 – 5.5 mm |
| 5 | Bulky (Chunky) | 12 – 15 sts | 6.5 – 9 mm | 5.5 – 8 mm |
| 6 | Super Bulky | 7 – 11 sts | 9 – 15 mm | 8 – 12 mm |
| 7 | Jumbo | 6 sts or fewer | +15 mm | +12 mm |
How much yarn do I need to crochet a blanket?
Crochet creates a denser structure and uses slightly more fiber than knitting.
The approximate quantities for blankets are calculated for medium stitch, with medium tension, and made with standard-weight yarn for each weight category.
With this technique, projects usually need 10% to 20% more yarn than if you made them with knitting needles.
💡 Idealium tip:
If you’re going to use openwork stitches, shell stitches, or granny stitch, you can subtract 10–15%.
On the other hand, if you prefer a dense fabric (single crochet or very tight medium stitch), add 10% more.
| Blankets | |||
| Category weight |
Baby blanket 70×90 cm |
Sofa throw 120×150 cm |
Large blanket 150×200 cm |
| (0) Lace | 300 | 700 | 1100 |
| (1) Fingering | 350 | 800 | 1300 |
| (2) Sport | 400 | 950 | 1500 |
| (3) DK | 450 | 1050 | 1700 |
| (4) Worsted | 550 | 1200 | 1900 |
| (5) Bulky | 650 | 1400 | 2200 |
| (6) Super Bulky | 750 | 1600 | 2500 |
| (7) Jumbo | 900 | 1900 | 3000 |
The quantities are expressed in total grams, rounded to the nearest 50 g, to make it easier to calculate how many skeins you need.
How much yarn do I need to knit a blanket with knitting needles (knit stitch)
If you prefer knitting needles, yarn usage will be slightly lower.
These quantities are calculated for plain stockinette stitch or garter stitch, with average tension and medium-weight yarn.
| Blankets | |||
| Category weight |
Baby blanket 70×90 cm |
Sofa throw 120×150 cm |
Large blanket 150×200 cm |
| (0) Lace | 250 | 600 | 950 |
| (1) Fingering | 300 | 700 | 1100 |
| (2) Sport | 350 | 800 | 1300 |
| (3) DK | 400 | 900 | 1400 |
| (4) Worsted | 450 | 1000 | 1600 |
| (5) Bulky | 550 | 1150 | 1850 |
| (6) Super Bulky | 650 | 1300 | 2100 |
| (7) Jumbo | 750 | 1500 | 2400 |
The quantities are expressed in total grams, rounded to the nearest 50 g, to make it easier to calculate how many skeins you need.
How to adjust yarn usage to your design
Sometimes a simple detail can significantly change the amount of yarn needed. Keep these factors in mind:
- Textured stitches or cables: +10–25%.
- Lace or mesh stitches: –10–15 %.
- Multiple colors (stripes or blocks): divide the total in proportion to the design.
Tips
- Always buy one extra skein. Even if your calculations are accurate, your knitting tension may differ or the chosen pattern may use slightly more yarn than expected. Also, if you run out of yarn later, it may be difficult to obtain the same dye lot.
- Make a swatch. It will help you adjust the size and check the blanket's drape before knitting the entire piece.
- Choose colors that inspire you. A blanket takes many hours of work, so choose shades that convey calm or joy, depending on the atmosphere you want to create.
In summary
Calculating how much yarn you need for a blanket isn't complicated if you take into account the size, yarn weight, and stitch pattern you'll use.
With good planning and the right materials, you'll enjoy a relaxing and highly satisfying project.
