Quick answer. A double-bed chunky crochet blanket of 180 by 220 cm takes about 1500 m of yarn by the middle of 47 patterns, and between 1128 and 1814 m inside the lower and upper quartile. Buy for the upper figure. The chart below covers five sizes from a sofa throw to super king.
Ask an AI how much yarn for a crochet blanket you need in chunky yarn, and the answer comes in metres of chunky yarn with no bed size attached. Ask again for a large yarn blanket chunky crochet style, and one answer says 550 to 1300 m while the next says 1500 to 2500 m. Both sound sure of themselves, and neither tells you the size of your bed.
For a chunky crochet blanket yarn count, the gap is real, and it is not a mistake in either answer. Patterns themselves disagree this widely, so the sections below turn the spread into a number you can buy for your own size.
For a pattern file that prints its yardage next to the size, Floral Ripple is a place to start. If you think in skeins rather than metres, the skeins per size guide has the same chart in balls.
How many metres of yarn for a large chunky crochet blanket?
The middle of 47 crochet patterns for Bernat Blanket asks for 379 m of yarn per square metre of finished blanket. That is the number to carry into every sum on this page.
Bernat Blanket is a 300 g skein with 220 yards, which is 201 m. Counting in metres rather than skeins means the answer works for any chunky yarn, because you divide by the metres on your own label at the end.
- Lower quartile: about 285 m per square metre, the thrifty end, which is where the figures in the left column of the chart come from.
- Median: 379 m per square metre, the middle.
- Upper quartile: 458 m per square metre, the hungry end.
- Extremes: 97 and 955 m per square metre, which you should treat as outliers.
On a sofa throw of 130 by 170 cm (2.21 square metres) that is 837 m by the median and 629 to 1012 m inside the quartiles. The single hungriest pattern reaches 2110 m.
Free patterns print a yardage for their own size and their own yarn only, so you are left to scale it yourself. The sum below does that for you.
For a file that does the scaling, Blanket Bouquet prints its sizes.
Metres per bed size: 130 by 170 to 260 by 250 cm
The table gives five blanket sizes in centimetres, from a sofa throw to a super king cover. The sizes are the finished blanket with its overhang, not the mattress.
| Finished size | Square metres | Lower quartile | Median | Upper quartile | Most in the sample |
|---|---|---|---|---|---|
| 130 by 170 cm (sofa throw) | 2.21 | 629 m | 837 m | 1012 m | 2110 m |
| 150 by 210 cm (single bed) | 3.15 | 897 m | 1194 m | 1443 m | 3008 m |
| 180 by 220 cm (double bed) | 3.96 | 1128 m | 1501 m | 1814 m | 3782 m |
| 220 by 240 cm (king bed) | 5.28 | 1503 m | 2001 m | 2418 m | 5042 m |
| 260 by 250 cm (super king) | 6.50 | 1851 m | 2463 m | 2977 m | 6207 m |
Read down the median column and you will see the blanket grow faster than the width. Going from the sofa throw to the double bed adds 50 cm to the width and 50 to the length, yet it takes 1501 m instead of 837.
The reason is area. You get 3.96 square metres against 2.21, and the yarn follows the area, not the edge.
Use the upper quartile as your shopping figure. A blanket that finishes with spare yarn costs little, and one that runs out 20 rows short costs a lot more.
To test the method on a file you already own, Blanket Bouquet is a size close to the first row of the table.
The formula: square metres times 379
You can run the sum for any size, not just the five in the table. It takes three steps.
- Multiply the width in cm by the length in cm, then divide by 10000. That is the area in square metres.
- Multiply the area by 379 for the median metres.
- Multiply the area by 458 for the upper quartile, and round up.
For a 180 by 220 cm blanket, 180 x 220 / 10000 gives 3.96 square metres. Then 3.96 x 379 is 1501 m, and 3.96 x 458 is 1814 m.
Weight is a useful check. Bernat Blanket runs about 67 m to 100 g, so the 1501 m double bed weighs close to 2.2 kg. If your total in grams looks very different from the weight you are carrying home, one of the two numbers is wrong.
Pro tip: write the area on the label of the first skein, so you do not do the sum twice. For a second worked example, the Bernat Blanket guide to balls per throw runs the same idea in balls, and the Solid Granny Square pattern is a pattern where you can compare a stated size against the sum.
Why one pattern takes 837 m and another 2110 m for the same throw
The spread comes from the pattern, not from a mistake in the count. For a 130 by 170 cm throw the middle pattern uses 837 m, while the hungriest pattern in the sample reaches 2110 m. Per square metre the extremes are 97 and 955 m.
Stitch is one cause. A lacy, open stitch uses fewer metres than a dense one, and on the same area two stitches can differ by about a third. On worsted yarn, granny stitch takes 0.93 yards per square inch and mini bean takes 1.26, a gap of 36%.
Tension is the other. If your hand is tight you pack more yarn into each square, and if it is loose you spread it. You cannot see this from the pattern text.
- Open stitch: fewer metres, a thinner blanket, more drape.
- Dense stitch: more metres, a heavier blanket, less drape.
- Tight hand: more metres for the same size.
- Loose hand: fewer metres, but a floppier fabric.
The result is that a pattern is honest about its own blanket and silent about yours. That is why the chart gives a range, and why the upper end is the one to buy.
If you would rather follow a file that states what it used, South African Safari is written as one complete blanket.
Turning metres into balls for any chunky yarn
Once you have the metres, the shop only sells balls. Divide your total by the metres on the label and round up.
The label matters more than the word on it. Chunky and super bulky yarns hold anything from 16 to 109 yards in 100 g, and that is a gap of 7 times inside one category.
- Bernat Blanket: 220 yards (201 m) in a 300 g skein, so the 1814 m upper figure for a double bed is nine skeins and you buy 10.
- The same skein on a sofa throw: the 1012 m upper figure for 130 by 170 cm divides into just over five skeins, and because a part skein is no use you buy six.
- Bernat Blanket Extra: 97 yards (about 89 m) in a 300 g skein, so the same blanket is about 21 skeins.
Run the upper quartile column through a 201 m skein and the whole chart turns into a shopping list: 6 skeins for the sofa throw, 8 for a single, 10 for a double, 13 for a king and 15 for a super king. Those counts hold for Bernat Blanket only, so check your own label before you load the basket.
The second line is the trap. A blanket that needs 2000 yards is 10 skeins of Blanket and 21 of Blanket Extra, and the labels look almost the same.
Never convert a pattern from one yarn to another by ball count. Convert by metres, using the band on the ball in your hand. Counting yards, not balls explains the step.
A written file helps here because it names the yarn it assumes. The Woodland Animal blanket is a design where you should read that line before buying.
Why AI answers say 550 m and 2500 m
One AI answer gave 550 to 1300 m for a large chunky blanket, and another gave 1500 to 2500 m. Taken separately each sounds reasonable, and together they differ by nearly a factor of two.
The first splits the answer by yarn category and gives smaller ranges for thicker yarn, with the lowest figure at 550 m.
The second gives a single starting estimate and a rule: divide the total by the metres in a ball, round up, add 10 to 15 per cent. The rule is good. The estimate has no size attached, so you cannot tell whether it is a throw or a bed.
The chart above sits between them. A sofa throw lands at 837 m and a double bed at 1501 m, which fits both ranges once you know which size each one meant.
No page in the top results gives metres by bed size in centimetres with a spread from real patterns. That is the gap this page fills, and the reason the chart gives a range and not a single figure.
For a pattern that states its size instead of leaving you to guess, Floral Ripple prints it.
How much does the stitch change the yarn?
More than most people expect, and less than the pattern spread. On the same area, a dense stitch can take about a third more yarn than an open one.
Within one stitch the use is steady. A granny stitch pattern written in ten sizes stays between 0.89 and 0.98 yards per square inch from the smallest to the largest. So once you know how your stitch behaves, the chart scales cleanly.
I check this on every blanket. I work a small swatch, weigh it against the area, and I know where the blanket will sit between the lower and upper quartile.
- Open or lacy stitch: aim near the lower quartile.
- Plain double crochet or half double: aim near the median.
- Bobbles, waffle and cables: aim at the upper quartile or above.
Textured stitches are the ones that push a blanket toward the top of the range. I find a side-by-side easier than any rule, and the moss, shell and granny comparison shows how three of them behave at the same width. For a file that names its stitch and yarn, Blanket Bouquet is one I would read first.
Buy the upper quartile, not the median
If you have not picked a blanket yet, the DIY chunky yarn blanket guide walks through the sizes first, and this page tells you what to buy once the size is set.
The median is the middle of the sample, and half of the patterns need more. If you buy the median, you have a coin-flip chance of running out.
The upper quartile is the figure that three out of four patterns stay under. For a double bed that is 1814 m, which is 10 skeins of Bernat Blanket.
The extra yarn is not waste. Leftover yarn is a repair kit for the first hole, and it covers a tension drift or a wider border.
- Add 10 to 15 per cent on top if your stitch is textured.
- Buy the same dye lot: the lot number is printed on the band.
- Keep the bands: if you need another ball, the shop will ask for the lot.
I keep one spare ball for every blanket over 3 square metres. I would rather return one unopened ball than hunt for a missing one. I learned that on a king blanket where the last ball came from another batch. A fresh ball from a different batch can show as a stripe, and chunky yarn does not hide a stripe.
That is the honest limit of this chart, and I say so because I have felt it. For a plan with the edge counted in, the Solid Granny Square pattern is worth a look, and the large knitted blanket guide shows the same sums for knitting. It tells you how much yarn most patterns use, not how much yours does, so the margin is the part you cannot skip.
I ran out of yarn halfway through
I have run out mid-row, and you notice it when the rows start to feel short and the last ball is already half used. Count the rows you have left and the yarn in your hand before you decide anything. The Bernat chunky blanket page lists the yarn lots to ask for.
There are three moves, in order of how much they cost.
- Finish smaller. Shorten the blanket by a few rows and bind off early.
- Buy the same lot. If the band is still in the bin, the shop can often find the same lot number.
- Spread a new lot. Alternate two rows of the old ball and two of the new one across the join, so the change is a gradient, not a line.
The third move works because chunky yarn shows a hard edge between two lots. When you blend the two, you soften the line.
I take the first move most often. A blanket that is a little short still works as a lap blanket (the large knitted blanket shows how big one must be to count as large), and a mid-blanket stripe never goes away.
Ending a chunky blanket neatly is its own small job, and the no-knot ending guide shows the finish; it takes yarn too: allow extra for the finishing row. For a file that plans the edge into the count, Blanket Bouquet is one to read.
When a ready pattern with the yardage printed is easier
The chart does the job for a plain blanket you design yourself, such as a DIY crochet throw. It does less when the blanket has colour changes, because each colour has its own count.
A written file fills the gap. It prints the yarn, the hook, the size and the yardage in one place, so you do not scale anything yourself.
For a gift that must come out to a stated size, or a first big blanket, a file like that is worth having. For a plain blanket in one colour, the sum above is enough.
- Use the chart: one colour, one stitch, a size of your choice.
- Use a file: several colours, a gift, or a size you cannot test.
Several designs print their sizes. Floral Ripple and the Solid Granny Square pattern are two to compare.
Questions about yarn amounts for chunky blankets
How many metres of yarn for a large chunky crochet blanket?
For a double bed of 180 by 220 cm, about 1501 m by the median and 1128 to 1814 m inside the quartiles. A sofa throw of 130 by 170 cm takes 837 m by the median.
How many metres are in a standard chunky yarn ball?
It depends on the yarn. Bernat Blanket holds 201 m in a 300 g skein, while Bernat Blanket Extra holds about 89 m. Always read the label on the ball in your hand.
How much extra yarn should I buy for safety?
Buy for the upper quartile, then add 10 to 15 per cent if your stitch is textured. Buy every ball from the same dye lot.
What crochet stitch uses the least yarn?
Open, lacy stitches use the least, and dense or textured stitches such as bobbles, waffle and cables use the most. On worsted yarn the gap between two common stitches was 36%.
How do I compare chunky, super bulky and jumbo yarns?
Compare metres per 100 g, not the category name. Super bulky yarns run from 16 to 109 yards in 100 g, so the category tells you very little about how many balls you need.
Why do AI answers give such different amounts?
They answer for different sizes and different yarn weights, and most do not say which. One gave 550 to 1300 m and another 1500 to 2500 m for a large blanket. Use the chart for your own size.
Can I use the skeins chart instead?
Yes, if you are using Bernat Blanket. The skeins per size chart gives the same sizes in balls, and for a file that names its yarn, South African Safari is one to read first.
