Free tool · C2C crochet

C2C bobbin calculator.

Bring your own corner-to-corner graph: paint it, paste it or import the picture or PDF you bought. The tool follows every colour area through every diagonal row and tells you how many bobbins to wind, how much yarn goes on each, and which bobbin works which tiles in every row. Nothing leaves your device.

  • The bobbins of your graph, counted. The example is our Reindeer Hearts C2C Blanket: 91 bobbins, never more than 9 hanging at once, with the yarn to wind on each.
  • Every row names its bobbin. Join a new one where it says *, cut where it says ✂, and carry short gaps inside the tiles if you like.
  • Picked up where you left it. A bobbin only carries on into the next row next to where it stopped; otherwise the plan starts a new one.
  • Checked against your graph. The written rows are read back and rebuild your graph tile by tile before you see them.

Purlgrid · C2C bobbin plan · purlgrid.com/tools/c2c-bobbin-calculator/

  • Graph45 × 56 tiles · 4 colours · 100 diagonal rows · about 85.5 × 106.4 cm (33.75 × 42 in) with 1.9 cm tiles
  • Bobbins91 bobbins, never more than 9 hanging at once. Yarn is carried inside the tiles across gaps of up to 2 tiles.
  • Colour AA 1903 tiles · 61 bobbins (1 from the ball), up to 4 at once · ≈ 1180 m (1291 yd) in all
  • Colour BB 443 tiles · 18 bobbins, up to 4 at once · ≈ 290 m (318 yd) in all
  • Colour CC 150 tiles · 6 bobbins, up to 2 at once · ≈ 100 m (110 yd) in all
  • Colour DD 24 tiles · 6 bobbins, up to 2 at once · ≈ 20 m (22 yd) in all
  • Checked7 checks passed: the written rows rebuild your graph tile by tile and every bobbin is picked up where it was left.
Your graph

Bought a graph? Load it, mark the tiles and we read every one. The file stays on your device.

Paste a graph as text

One line per row, top row first. A full stop is the first colour; every other symbol becomes the next colour.

Colours

Pick a colour, then click or drag on the graph. Click a tile of the same colour to clear it to colour A.

Size in tiles

Up to 120 × 120 tiles and 12 colours.

Yarn and tile
Carrying

Carrying works the yarn inside the tiles of another colour instead of cutting it. C2C tutorials advise 1 to 3 tiles at most.

Import a graph
  1. Drag a box around the tiles only, not the row numbers.
  2. Set how many tiles across and up, so a dot sits in the middle of every tile.
  3. Import, then compare it with the original and fix any tile on the graph.

Your bobbin plan

Wind, join, carry and cut.

Everything below follows the graph above. In the map each bobbin has its own shade of its colour and its name on the tile where it starts.

Bobbin map

51015202530354045510152025303540455055A1B1A2C1A3A4A5A6D1A7A8B2B3A9A10A11A12C2A13A14B4A15A16A17B5A18A19D2A20A21B6A22B7A23A24A25A26B8C3A27C4A28A29A30A31A32B9B10A33D3A34D4A35A36B11A37A38B12A39B13A40A41A42B14C5A43A44B15A45A46A47B16D5A48A49B17A50B18A51A52A53A54C6A55A56A57A58D6A59A60A61

Bobbins to wind

BobbinRowsTilesWind
A11–93421.5 m · 24 yd
B15–467244 m · 49 yd
A29–133421.5 m · 24 yd
C112–202515.5 m · 17 yd
A313–14117.5 m · 9 yd
A414–183119.5 m · 22 yd
A516–1796 m · 7 yd
A617–203019 m · 21 yd
D120–2243 m · 4 yd
A720–21128 m · 9 yd
A821–246640.5 m · 45 yd
B224–312415 m · 17 yd
B324–28117 m · 8 yd
A924–25106.5 m · 8 yd
A1025–262817.5 m · 20 yd
A1126–304125.5 m · 28 yd
A1228–291811.5 m · 13 yd
C228–362515.5 m · 17 yd
A1329–302516 m · 18 yd
A1430–323723 m · 26 yd
B431–33106.5 m · 8 yd
A1532–343220 m · 22 yd
A1632–3396 m · 7 yd
A1733–397244.5 m · 49 yd
B533–434226 m · 29 yd
A183475 m · 6 yd
A193675 m · 6 yd
D236–3843 m · 4 yd
A2036–37128 m · 9 yd
A2137–407546 m · 51 yd
B639–4296 m · 7 yd
A2239–411610.5 m · 12 yd
B740–44117 m · 8 yd
A2340–41106.5 m · 8 yd
A2441–423522 m · 25 yd
A2541–475836 m · 40 yd
A2642–456137.5 m · 42 yd
B844–542918.5 m · 21 yd
C344–522515.5 m · 17 yd
A2745–464528 m · 31 yd
C445–532515.5 m · 17 yd
A2846–473019 m · 21 yd
A294711 m · 2 yd
A3047–508653 m · 58 ydfrom the ball
A3148–524327 m · 30 yd
A3249–533924.5 m · 27 yd
B950–593220 m · 22 yd
B1051–582717 m · 19 yd
A335185.5 m · 7 yd
D352–5443 m · 4 yd
A3452–553622.5 m · 25 yd
D453–5543 m · 4 yd
A3553–564226 m · 29 yd
A3654–605433.5 m · 37 yd
B1155–967244 m · 49 yd
A3756–572918 m · 20 yd
A385785.5 m · 7 yd
B1257–61117 m · 8 yd
A3957–594628.5 m · 32 yd
B1359–611811.5 m · 13 yd
A4059–60106.5 m · 8 yd
A4160–636842 m · 46 yd
A4260–653522 m · 25 yd
B1461–724327 m · 30 yd
C561–692515.5 m · 17 yd
A4363–64138.5 m · 10 yd
A4464–675031 m · 34 yd
B1564–6696 m · 7 yd
A4564–6585.5 m · 7 yd
A4665–683019 m · 21 yd
A4768–694226 m · 29 yd
B166811 m · 2 yd
D569–7143 m · 4 yd
A4869–726138 m · 42 yd
A4972–732817.5 m · 20 yd
B1773–77117 m · 8 yd
A507364 m · 5 yd
B1873–77117 m · 8 yd
A5173–753622.5 m · 25 yd
A527564 m · 5 yd
A5375–76106.5 m · 8 yd
A5476–796339 m · 43 yd
C677–852515.5 m · 17 yd
A5579–80138.5 m · 10 yd
A5680–832616.5 m · 19 yd
A5781–843019 m · 21 yd
A5884–85149 m · 10 yd
D685–8743 m · 4 yd
A5985–883220 m · 22 yd
A6088–923924.5 m · 27 yd
A6192–1003622.5 m · 25 yd

Engine checks

  • All 100 diagonal rows follow the increase/decrease rules at both edges
  • 2520 tiles in total (45 × 56)
  • Every row's written colour counts add up to that row's tile count
  • The 100 written rows, read on their own, rebuild every tile of your graph
  • Replaying the 91 bobbins row by row gives every row's colours in working order
  • All 365 times a bobbin carries on into the next row, it is picked up next to where it stopped (at most 2 tiles away)
  • Each of the 2520 tiles belongs to exactly one bobbin, and each colour's bobbins add up to its tiles
Every row with its bobbins (100 diagonal rows)

The letter is the colour, the number the bobbin; numbers before them are tiles. * = join a new bobbin here. A bobbin named twice in one row is carried inside the tiles in between. ✂ = cut after this row, leaving a 15 cm (6 in) tail. Start at the bottom right corner: odd rows ↗, even rows ↙.

  1. Row 1 ↗ (1) 1 A1*
  2. Row 2 ↙ (2) 2 A1
  3. Row 3 ↗ (3) 3 A1
  4. Row 4 ↙ (4) 4 A1
  5. Row 5 ↗ (5) 2 A1, 1 B1*, 2 A1
  6. Row 6 ↙ (6) 2 A1, 1 B1, 3 A1
  7. Row 7 ↗ (7) 3 A1, 1 B1, 3 A1
  8. Row 8 ↙ (8) 3 A1, 1 B1, 4 A1
  9. Row 9 ↗ (9) 2 A1, 3 B1, 4 A2* ✂ A1
  10. Row 10 ↙ (10) 5 A2, 2 B1, 3 A2
  11. Row 11 ↗ (11) 3 A2, 1 B1, 7 A2
  12. Row 12 ↙ (12) 3 A2, 1 C1*, 3 A2, 1 B1, 4 A2
  13. Row 13 ↗ (13) 2 A2, 3 B1, 3 A3*, 1 C1, 4 A3 ✂ A2
  14. Row 14 ↙ (14) 4 A3, 3 C1, 2 A4*, 2 B1, 3 A4 ✂ A3
  15. Row 15 ↗ (15) 3 A4, 1 B1, 4 A4, 2 C1, 5 A4
  16. Row 16 ↙ (16) 4 A4, 4 C1, 3 A5*, 1 B1, 4 A5
  17. Row 17 ↗ (17) 2 A5, 3 B1, 3 A6*, 4 C1, 5 A4 ✂ A5
  18. Row 18 ↙ (18) 5 A4, 5 C1, 3 A6, 2 B1, 3 A6 ✂ A4
  19. Row 19 ↗ (19) 3 A6, 1 B1, 7 A6, 2 C1, 6 A6
  20. Row 20 ↙ (20) 5 A6, 1 D1*, 3 C1, 6 A7*, 1 B1, 4 A7 ✂ A6 C1
  21. Row 21 ↗ (21) 2 A7, 3 B1, 9 A8*, 1 D1, 6 A8 ✂ A7
  22. Row 22 ↙ (22) 6 A8, 2 D1, 9 A8, 2 B1, 3 A8 ✂ D1
  23. Row 23 ↗ (23) 3 A8, 1 B1, 19 A8
  24. Row 24 ↙ (24) 5 A8, 1 B2*, 6 A8, 3 B3*, 4 A9*, 1 B1, 4 A9 ✂ A8
  25. Row 25 ↗ (25) 2 A9, 3 B1, 5 A10*, 2 B3, 7 A10, 1 B2, 5 A10 ✂ A9
  26. Row 26 ↙ (26) 5 A10, 1 B2, 1 A10, 1 B2, 5 A10, 3 B3, 5 A11*, 2 B1, 3 A11 ✂ A10
  27. Row 27 ↗ (27) 3 A11, 1 B1, 7 A11, 1 B3, 7 A11, 1 B2, 1 A11, 2 B2, 4 A11
  28. Row 28 ↙ (28) 4 A11, 4 B2, 7 A12*, 2 B3, 2 A12, 1 C2*, 3 A12, 1 B1, 4 A12 ✂ B3
  29. Row 29 ↗ (29) 2 A12, 3 B1, 3 A13*, 1 C2, 12 A13, 4 B2, 4 A11 ✂ A12
  30. Row 30 ↙ (30) 3 A11, 6 B2, 2 A13, 1 B2, 8 A13, 3 C2, 2 A14*, 2 B1, 3 A14 ✂ A11 A13
  31. Row 31 ↗ (31) 3 A14, 1 B1, 4 A14, 2 C2, 9 A14, 1 B2, 1 A14, 1 B2, 3 A14, 1 B4*, 5 A14 ✂ B2
  32. Row 32 ↙ (32) 5 A14, 2 B4, 2 A14, 3 B4, 1 A15*, 1 B4, 6 A15, 4 C2, 3 A16*, 1 B1, 4 A16 ✂ A14
  33. Row 33 ↗ (33) 2 A16, 3 B1, 3 A17*, 4 C2, 7 A15, 1 B4, 1 A15, 2 B4, 3 A15, 1 B5*, 6 A15 ✂ A16 B4
  34. Row 34 ↙ (34) 7 A15, 2 B5, 1 A15, 4 B5, 7 A18*, 5 C2, 3 A17, 2 B1, 3 A17 ✂ A15 A18
  35. Row 35 ↗ (35) 3 A17, 1 B1, 7 A17, 2 C2, 9 A17, 2 B5, 2 A17, 1 B5, 8 A17
  36. Row 36 ↙ (36) 9 A17, 5 B5, 7 A19*, 1 D2*, 3 C2, 6 A20*, 1 B1, 4 A20 ✂ A19 C2
  37. Row 37 ↗ (37) 2 A20, 3 B1, 9 A21*, 1 D2, 8 A21, 4 B5, 10 A17 ✂ A20
  38. Row 38 ↙ (38) 10 A17, 4 B5, 8 A21, 2 D2, 9 A21, 2 B1, 3 A21 ✂ D2
  39. Row 39 ↗ (39) 3 A21, 1 B1, 21 A21, 3 B5, 5 A17, 3 B6*, 3 A22* ✂ A17
  40. Row 40 ↙ (40) 4 A22, 2 B6, 5 A22, 3 B5, 14 A21, 3 B7*, 4 A23*, 1 B1, 4 A23 ✂ A21
  41. Row 41 ↗ (41) 2 A23, 3 B1, 5 A24*, 2 B7, 15 A24, 3 B5, 4 A22, 3 B6, 4 A25* ✂ A23 A22
  42. Row 42 ↙ (42) 6 A25, 1 B6, 4 A25, 3 B5, 15 A24, 3 B7, 5 A26*, 2 B1, 3 A26 ✂ B6 A24
  43. Row 43 ↗ (43) 3 A26, 1 B1, 7 A26, 1 B7, 16 A26, 5 B5, 2 A25, 2 B5, 6 A25 ✂ B5
  44. Row 44 ↙ (44) 12 A25, 3 B8*, 16 A26, 2 B7, 2 A26, 1 C3*, 3 A26, 1 B1, 4 A26 ✂ B7
  45. Row 45 ↗ (45) 2 A26, 3 B1, 3 A27*, 1 C3, 21 A27, 3 B8, 8 A25, 1 C4*, 3 A25 ✂ A26
  46. Row 46 ↙ (45) 4 A25, 1 C4, 6 A25, 3 B8, 1 A27, 1 B8, 20 A27, 3 C3, 2 A28*, 2 B1, 2 A28 ✂ A27 B1
  47. Row 47 ↗ (45) 6 A28, 2 C3, 20 A28, 3 B8, 1 A29*, 3 B8, 3 A25, 3 C4, 4 A30* ✂ A28 A29 A25
  48. Row 48 ↙ (45) 5 A30, 2 C4, 3 A30, 2 B8, 2 A30, 1 B8, 1 A30, 1 B8, 19 A30, 4 C3, 5 A31*
  49. Row 49 ↗ (45) 4 A31, 4 C3, 19 A30, 1 B8, 2 A30, 1 B8, 6 A30, 4 C4, 4 A32*
  50. Row 50 ↙ (45) 5 A32, 4 C4, 3 A30, 1 B8, 2 A30, 1 B8, 15 A30, 1 B9*, 5 A30, 5 C3, 3 A31 ✂ A30
  51. Row 51 ↗ (45) 5 A31, 2 C3, 6 A31, 1 B9, 8 A31, 4 B10*, 3 A33*, 1 B8, 5 A33, 5 C4, 5 A32 ✂ A33
  52. Row 52 ↙ (45) 6 A32, 2 C4, 6 A32, 2 B8, 3 A32, 4 B10, 8 A31, 1 B9, 1 A31, 1 B9, 3 A31, 1 D3*, 3 C3, 4 A34* ✂ A31 C3
  53. Row 53 ↗ (45) 6 A34, 1 D3, 4 A34, 1 B9, 9 A34, 4 B10, 3 A32, 1 B8, 7 A32, 3 C4, 1 D4*, 5 A35* ✂ A32 C4
  54. Row 54 ↙ (45) 6 A35, 1 D4, 9 A35, 1 B8, 3 A35, 4 B10, 7 A34, 3 B9, 4 A36*, 2 D3, 5 A36 ✂ B8 D3
  55. Row 55 ↗ (45) 11 A36, 3 B9, 6 A34, 4 B10, 13 A35, 2 D4, 2 A35, 2 B11*, 2 A35 ✂ A34 D4
  56. Row 56 ↙ (45) 2 A35, 3 B11, 18 A37*, 2 B10, 6 A37, 4 B9, 2 A36, 1 B9, 7 A36 ✂ A35
  57. Row 57 ↗ (44) 7 A36, 1 B9, 1 A36, 5 B9, 5 A37, 3 B10, 8 A38*, 3 B12*, 6 A39*, 1 B11, 4 A39 ✂ A37 A38
  58. Row 58 ↙ (43) 3 A39, 1 B11, 7 A39, 2 B12, 9 A39, 2 B10, 5 A39, 7 B9, 1 A36, 1 B9, 5 A36 ✂ B10
  59. Row 59 ↗ (42) 5 A36, 1 B9, 1 A36, 1 B9, 3 A36, 4 B13*, 1 A39, 2 B13, 11 A39, 3 B12, 5 A40*, 2 B11, 3 A40 ✂ B9 A39
  60. Row 60 ↙ (41) 2 A40, 3 B11, 6 A41*, 1 B12, 12 A41, 7 B13, 2 A36, 3 B13, 5 A42* ✂ A40 A36
  61. Row 61 ↗ (40) 5 A42, 2 B13, 3 A42, 6 B14*, 9 A41, 1 C5*, 2 A41, 2 B12, 5 A41, 1 B11, 4 A41 ✂ B13 B12
  62. Row 62 ↙ (39) 3 A41, 1 B11, 10 A41, 1 C5, 10 A41, 6 B14, 1 A42, 2 B14, 5 A42
  63. Row 63 ↗ (38) 4 A42, 2 B14, 2 A42, 1 B14, 2 A42, 4 B14, 7 A41, 3 C5, 8 A43*, 2 B11, 3 A43 ✂ A41
  64. Row 64 ↙ (37) 2 A43, 3 B11, 8 A44*, 2 C5, 6 A44, 5 B14, 3 A42, 4 B15*, 4 A45* ✂ A43
  65. Row 65 ↗ (36) 4 A45, 3 B15, 4 A42, 2 B14, 1 A42, 3 B14, 4 A44, 4 C5, 6 A46*, 1 B11, 4 A46 ✂ A45 A42
  66. Row 66 ↙ (35) 3 A46, 1 B11, 7 A46, 4 C5, 3 A44, 2 B14, 2 A44, 1 B14, 6 A44, 2 B15, 4 A44 ✂ B15
  67. Row 67 ↗ (34) 10 A44, 1 B14, 1 A44, 1 B14, 6 A44, 5 C5, 5 A46, 2 B11, 3 A46 ✂ A44
  68. Row 68 ↙ (33) 2 A46, 3 B11, 5 A47*, 2 C5, 6 A47, 1 B14, 2 A47, 1 B14, 7 A47, 1 B16*, 3 A47 ✂ A46 B16
  69. Row 69 ↗ (32) 11 A47, 1 B14, 8 A47, 3 C5, 1 D5*, 3 A48*, 1 B11, 4 A48 ✂ A47 C5
  70. Row 70 ↙ (31) 3 A48, 1 B11, 4 A48, 1 D5, 9 A48, 2 B14, 11 A48
  71. Row 71 ↗ (30) 10 A48, 1 B14, 10 A48, 2 D5, 2 A48, 2 B11, 3 A48 ✂ D5
  72. Row 72 ↙ (29) 2 A48, 3 B11, 13 A49*, 1 B14, 10 A49 ✂ A48 B14
  73. Row 73 ↗ (28) 5 A49, 3 B17*, 6 A50*, 3 B18*, 6 A51*, 1 B11, 4 A51 ✂ A49 A50
  74. Row 74 ↙ (27) 3 A51, 1 B11, 7 A51, 2 B18, 7 A51, 2 B17, 5 A51
  75. Row 75 ↗ (26) 4 A51, 3 B17, 6 A52*, 3 B18, 5 A53*, 2 B11, 3 A53 ✂ A51 A52
  76. Row 76 ↙ (25) 2 A53, 3 B11, 6 A54*, 1 B18, 8 A54, 1 B17, 4 A54 ✂ A53
  77. Row 77 ↗ (24) 3 A54, 2 B17, 4 A54, 1 C6*, 2 A54, 2 B18, 5 A54, 1 B11, 4 A54 ✂ B17 B18
  78. Row 78 ↙ (23) 3 A54, 1 B11, 10 A54, 1 C6, 8 A54
  79. Row 79 ↗ (22) 6 A54, 3 C6, 8 A55*, 2 B11, 3 A55 ✂ A54
  80. Row 80 ↙ (21) 2 A55, 3 B11, 8 A56*, 2 C6, 6 A56 ✂ A55
  81. Row 81 ↗ (20) 5 A56, 4 C6, 6 A57*, 1 B11, 4 A57
  82. Row 82 ↙ (19) 3 A57, 1 B11, 7 A57, 4 C6, 4 A56
  83. Row 83 ↗ (18) 3 A56, 5 C6, 5 A57, 2 B11, 3 A57 ✂ A56
  84. Row 84 ↙ (17) 2 A57, 3 B11, 5 A58*, 2 C6, 5 A58 ✂ A57
  85. Row 85 ↗ (16) 4 A58, 3 C6, 1 D6*, 3 A59*, 1 B11, 4 A59 ✂ A58 C6
  86. Row 86 ↙ (15) 3 A59, 1 B11, 4 A59, 1 D6, 6 A59
  87. Row 87 ↗ (14) 5 A59, 2 D6, 2 A59, 2 B11, 3 A59 ✂ D6
  88. Row 88 ↙ (13) 2 A59, 3 B11, 8 A60* ✂ A59
  89. Row 89 ↗ (12) 7 A60, 1 B11, 4 A60
  90. Row 90 ↙ (11) 3 A60, 1 B11, 7 A60
  91. Row 91 ↗ (10) 5 A60, 2 B11, 3 A60
  92. Row 92 ↙ (9) 2 A60, 3 B11, 4 A61* ✂ A60
  93. Row 93 ↗ (8) 3 A61, 1 B11, 4 A61
  94. Row 94 ↙ (7) 3 A61, 1 B11, 3 A61
  95. Row 95 ↗ (6) 2 A61, 1 B11, 3 A61
  96. Row 96 ↙ (5) 2 A61, 1 B11, 2 A61 ✂ B11
  97. Row 97 ↗ (4) 4 A61
  98. Row 98 ↙ (3) 3 A61
  99. Row 99 ↗ (2) 2 A61
  100. Row 100 ↙ (1) 1 A61 ✂ A61

How many bobbins?

One for every area of colour.

In C2C each area of colour in a diagonal row needs its own bobbin. When the area carries on into the next row, the same bobbin carries on, as long as it is hanging next to where the next row needs it. When an area splits, a new bobbin joins; when two areas meet, one is cut. The calculator follows every area through every row.

For the Reindeer Hearts C2C Blanket graph (45 × 56 tiles, 4 colours) that is 91 bobbins with yarn carried across gaps of up to 2 tiles, or 106 if you never carry. The background alone is 61 bobbins: the motifs cut it into many areas.

How much to wind: each tile takes about 29 × the tile size of yarn (about 55 cm for a 1.9 cm worsted tile), plus any yarn carried, two 15 cm tails and 10%. Bobbins over 50 m cover big areas; work those straight from the ball.

Questions

Before you wind a bobbin.

Which corner do I start from?

The bottom right corner of the graph, as most C2C graphs are drawn: row 1 is the single tile in that corner, odd rows go up towards the top right (↗) and even rows come back (↙). If your graph starts in another corner, turn the picture before you import it so its first tile is at the bottom right.

Can I use a graph I bought?

Yes: import the picture or PDF, drag a box around the tiles and set how many tiles across and up. Check the result against the original and repaint any tile it misread. The file stays on your device; nothing is uploaded.

Should I carry the yarn or cut it?

Carrying across one or two tiles saves bobbins and ends to weave in; longer carries pucker and can show through. Choose "Never carry" if your colours are very different, and the plan gives every area its own bobbin.

My graph has too many colour changes in one row. Is that a problem?

Check it in the chart checker, which marks busy C2C rows. This calculator plans the bobbins for whatever graph you give it.

I want a name on a blanket.

Use the crochet name blanket pattern maker: it draws the name, sizes the blanket and plans the bobbins with the same engine.

Is it free?

Yes. No account, nothing uploaded: the plan is made in your browser.

Back to the calculatorThe Reindeer Hearts C2C Blanket