C2C Blanket Calculator
Plan a corner to corner blanket: how many tiles across and down, when to stop increasing, and how much yarn to buy.
How many C2C tiles for a blanket?
Tiles across × down for common blanket sizes at three tile sizes. Classic double crochet C2C in worsted yarn is often around 0.75 in per tile.
| Blanket | 0.5 in tiles | 0.75 in tiles | 1 in tiles |
|---|---|---|---|
| Baby 30 × 35 in | 60 × 70 | 40 × 47 | 30 × 35 |
| Receiving 40 × 40 in | 80 × 80 | 53 × 53 | 40 × 40 |
| Lapghan 36 × 48 in | 72 × 96 | 48 × 64 | 36 × 48 |
| Throw 50 × 60 in | 100 × 120 | 67 × 80 | 50 × 60 |
| Twin 66 × 90 in | 132 × 180 | 88 × 120 | 66 × 90 |
| Queen 90 × 100 in | 180 × 200 | 120 × 133 | 90 × 100 |
| King 108 × 100 in | 216 × 200 | 144 × 133 | 108 × 100 |
How to make a C2C rectangle
C2C is worked in diagonal rows from one corner. A square is simple: increase until the diagonal is as long as the side, then decrease. A rectangle needs one extra phase in the middle:
- Increase on both sides until the row has as many tiles as the short side of the blanket.
- Increase on one side and decrease on the other until you reach the long side. The row length stays the same; the blanket gets longer.
- Decrease on both sides until one tile is left in the opposite corner.
The calculator gives you the exact row numbers for each phase. Keep a stitch marker on the side where you increase so you don't lose track.
Tips
- Your tile size changes with hook size and tension. Crochet a small test square of 10 × 10 tiles first.
- For picture blankets (graphghans), wind small bobbins for each colour block instead of working from full skeins.
- Add a simple single crochet border at the end to straighten the stepped edges.
Frequently asked questions
How many C2C tiles do I need for a throw blanket?
For a 50 × 60 inch throw: about 67 × 80 tiles with 0.75-inch tiles, or 50 × 60 with 1-inch tiles.
When do I stop increasing for a rectangle?
When a row has as many tiles as the short side. Then increase at one end and decrease at the other until you reach the long side, and finally decrease at both ends.
Does mini C2C use more yarn?
Yes, for the same area. Mini C2C with half double or single crochet makes a denser fabric, so it uses roughly 10–20% more yarn than classic double crochet C2C.