## Triangular Shawl Calculator

Here’s a little way to calculate the maximum number of rows you can work on a shawl (top down shawls only). You need to have knitted at least 20% of your yarn to do get an accurate answer, though it will return a result with more than 10% yarn used.

Triangular shawl
This calculation will work for any shawl pattern that starts at the top and has a consistent number of increases in each row. (ie. 4 increases on every right side row and 2 sts on every wrong side row, or 4increases every other row.)
(Examples of this type of shawl are: ‘Swallowtail’, ‘Ishbel’, ‘Aeolian’, ‘Kiri’, ‘Traveling Woman’, My ‘Dew Drops’ & ‘Danish Ripple’ Shawls)
(I know these shawls have slightly different shapes, but trust me the maths works for all of them.)

You need to know:

Number of Constant stitches in each row: (eg. Swallowtail: 5, Ishbel: 7, Aeolian: 5 or 7.) (usually edge stitches on each side + centre stitch) (If you don’t know this don’t worry too much as it doesn’t make a huge difference to the result.)

Total yarn weight: (This is how much yarn you have available for the project, in grams is best.)

Used yarn weight so far: (This is the total weight of yarn minus what you have left un-knitted.)

Rows worked so far: (with many shawl you can count the number of holes running up the middle next to the centre st and x2).

RESULT
Maximum Number of Rows:

This result is the number of rows you can work with the yarn you have available, it allows you 3rows worth of yarn to cast off which is sufficient for a very stretchy bind off.
If you pattern has a lot of increases in the final few rows, ie lots of yarn over’s for a pointier edge you will need to subtract a few more rows to allow for that.
If your pattern tells you to cast off with the yarn held double you will need to subtract a few more rows to allow for this.

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