We Do The Math For You: Free Bust Dart Worksheet

Dear AnnR of the Comments:

Regarding Bust Dart Math: You can do this. It doesn't take a genius. It's not really hard, I promise. Maybe the way I explained it made it seem hard, so today, I came up with a worksheet (and an Excel file!) that ought to make it super-easy for anyone. (I wanted to do an online calculator, but our programmers are a bit busy right now. Maybe later?)

AH, but wait. I have to give a special shout-out to Faye, the maths teacher, whose logical tweak to the formulas made things even easier than before. All the following are done using Faye's Fab Fix. Thank you, Faye!

So, here's that little worksheet for you:

There are only FIVE SIMPLE NUMBERS YOU NEED to bring to this math party; you and your calculator then sit down and figure out FIVE SIMPLE CALCULATIONS, and you're done.

Yes, it really is as easy as that.

And because I'm just that good, I have included an Excel worksheet that does all the calculations for you. It's not as spiffy as Jason's online waist shaping calculator, but we shall get there.


  • Full Bust Measurement (inches) —- A
  • Under Bust Measurment (inches) —- B
  • Gauge, stitches per ONE inche (sts) —- C
  • Total number of desired darts —- D
    (Example: If you want two darts per side, the total is four; if you want one dart per side, the total is two.)
  • Distance from "side seam" to nipple (inches) —- E


  • A minus B =  F           [Total Decrease Amount]
  • F times C =   G             [Faye's tweak of Total Stitches To Decrease]
  • G divided by D =  H      [Total Decrease Rounds]
  • E minus .25" =          [Location of Center Dart; see below]
  • J divided by 3 =  K         [Location of Side Dart; see below]


J is the measurement in inches from side seam to Center Dart.

K is the measurement in inches from the Center Dart to the Side Dart.

H is the total number of repeats for the dartly decrease rounds.

There you go! Dartage Alert! Don't forget to download the handy Excel worksheet that does the above for you–you can even choose inches or centimeters!

— Sandi

Sandi Wiseheart is the editor of Knitting Daily.

 What's on Sandi's needles? I'm zooming up the shoulders of the Drawstring Raglan. However, I took a break this week to knit a leetle gift for a friend who is getting married on Saturday. (You better not be reading this, Barb…).

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5 thoughts on “We Do The Math For You: Free Bust Dart Worksheet

  1. Blogpost added to favorites – but where can I find all my favorites on this site – there used to be a link in the top menu, right?


  2. Thanks so much for the mention Sandi, that was really sweet of you, and very exciting for me. I love all the blogs you post, you put such a lot of thought and effort into everything, it is all so helpful. I felt nervous sending in my comment to such an erudite knitter as yourself. so thanks again.
    PS. you don’t need to post this on the site.

  3. Appreciated the Excel Worksheet for the Bust Dart calculations.
    However, the first line under KNITTING INSTRUCTIONS is cut half in two. I think I figured it out to after the coma where it appears to be work to ? sts before the next side dart m,

    How many stitches?