February 16, 2018

Interactive Knitting Calculators


How many stitches should I cast on for a baby blanket?  What is the number of rows to loom knit a man’s scarf? How much yarn will I need to knit a queen size blanket?  I get these questions all the time and the fact is they can be tricky to answer.   I want to make it easy for you to find the answers for your specific project.  That’s why I created the Interactive Knitting Calculators you’ll find below.  These calculators can be used for both needle knitting or loom knitting projects.  (I even created special pins for both crafts below)  They are set up for you to use right here on the website by entering some details about your project and, since I have my own personal math elves, they’ll be crunching the numbers for you.  How easy is that?

What do I need to use the Interactive Knitting Calculators?

To calculate the Cast On or Row Count you need:

  • A gauge swatch (more about that below)
  • A ruler or tape measure (you can measure in inches or centimeters)
  • The width and length you want your finished project to be.  (You can find this on the pattern you’re using or you can enter the measurements you want to have if you’re not using a pattern.)

To calculate how much yarn for specific project you’ll also need:

  • The yarn label from your yarn. (If you lost the label, you can look up the details in the yarn database at
  • A postage or kitchen scale that can weigh small amounts (grams or ounces)

Making a Gauge Swatch

Each of the interactive knitting calculators below will use the measurements off a gauge swatch.  A gauge swatch is a small (usually a 6″ x 6″ square) knit in the stitch you plan to use for your project.  That means you’ll start by knitting a small square in the yarn you have for your project.  If you are planning an ewrap scarf make sure you use ewrap for your swatch.  For more detailed help, check out this blog post, Swatching or Making a Gauge Swatch.


How many stitches to cast on? How much yarn do I need? Use the Interactive Loom Knitting Calculators to find out. #goodknitkisses #knit #knitting #yarn

How many stitches to cast on? How much yarn do I need? Use the Interactive Loom Knitting Calculators to find out. #goodknitkisses #loomknit #loomknitting #yarn

Cast On Calculator

Sometimes you just want to knit a simple blanket with a border, but you want to know how many stitches you’ll need to cast on to get 42 inches.  It depends on a lot of things like the loom gauge/needle size, the stitch pattern, the yarn and your tension.  With this calculator you’ll be able to figure out exactly how many stitches you’ll need to get an exact width.

Row Count Calculator

Many patterns instruct you to knit a certain number of inches, but you may prefer to count rows.  Or if you’re just freestyling a scarf, but want to know how many rows you’ll need so you can space your stripes evenly this handy Row Count Calculator will tell you how many rows you will need to complete your project.  This one a must for planning your temperature blanket so you don’t end up with a 12 foot blanket at the end of the year!


Project Yardage / # of Skeins Calculator

This is one of the most asked questions I get!  How much yarn will I need to make a ________?  This is also one the most difficult to figure out because there are so many pieces of the puzzle.  I’ve simplified it down as much as I could, but there’s still a lot of information about your project you need to provide.

You’ll need to take some extra thoughts into considerations if your project is not a square or rectangle.  For a triangle, like a shawl, use the full length and full width measurement from your pattern but divide the yardage calculation in half.

NOTE:  This is NOT an exact calculation.  This calculator is designed to give a ballpark estimate.  It will be close, but it can’t be perfect.  If your blanket uses multiple stitch patterns, like garter and stockinette, it will be less accurate since each stitch pattern uses a different amount of yarn.  Also as your tension varies throughout a project you many use more or less yarn overall.


Video Tutorial to show you how to use these calculators!


Example of how to use the Cast On Calculator for the Loom Knit Free Spirit Topper (Ruana):

I hope you enjoy using these Interactive Yarn Calculators!  Please let me know on social media if you find them helpful by tagging me with #goodknitkisses.

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Kristen Mangus
About Kristen Mangus
Kristen is a multi-talented entrepreneur with a heart as big as Texas. She is the Owner, Host and Creative Director of GoodKnit Kisses. GoodKnit Kisses is a company positioned to inspire, encourage and empower people through education and design. She’s built a large and loyal on-line community of followers by sharing her personal passion for knitting and all things creative through YouTube video tutorials, Facebook live broadcasts, blogs and patterns. Her vision is to leave an inspired crafting world for future generations that continues to teach and reach others. She and her husband, John, have three amazing kids.
  1. This will be very useful! Thank you ☺

  2. Can I still use this calculator if I haven’t made a swatch? I’m a beginner and I’m trying to figure out how to cast on for a new hat.

  3. Will this work for hats?

  4. If I have to do a swatch to calculate, then I can’t calculate the amount of yarn I need before I buy enough.

  5. These look great – how can I download to my computer for future use?

  6. I have been following you on the website some years now. This interactive guide is amazing. It will be helpful.

  7. This is amazing! What a great resource to have! Thank you!

  8. Thank you ! I am always trying to find a calculator for making things on my rigid heddle loom. This is so perfect. You rock!

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