C2C Calculator

C2C Calculator

The unusual Corner-to-Corner (C2C) technique is so unique that it has revolutionized the crochet world. Learn how to use our C2C calculator to plan your projects easily. Let’s explore what’s there to know about C2C crochet, and get the answers to the most common questions.

Why Use a C2C Calculator?

Our C2C calculator is a useful tool for any crochet enthusiast. By using our online crochet calculator, you will be able to…

  • Determine how many C2C blocks you need to achieve the desired size of the project.
  • Design your own patterns, because it’s easy when you know how many “pixels” you need.
  • Easily estimate the amount of yarn you need for your project.
  • Plan the layout of your project. You know you have the right number of rows and columns of crochet “tiles”.

Whether you work on a detailed picture afghan or a cozy throw, a C2C calculator makes it much easier.

How to Use C2C Calculator?

This online tool helps you determine how many C2C “tiles” or “blocks” you need for the blanket size of your choice. Let’s see how to use it step-by-step:

  1. Make a 5-block by 5-block swatch in the C2C technique, using the yarn and hook you intend to use for the final project.
  2. Measure the swatch, preferably after blocking it (washing it gently and pinning it in place).
  3. Divide these measurements by 5 to get the average height and width of one little C2C block.
  4. Choose the type of units (inches or centimeters).
  5. Put the dimensions in the calculator and click “NEXT”.
  6. Choose the desired blanket dimensions from our list of predefined sizes, or set your own by choosing the “Custom” option. It will use the units you provided earlier.
  7. Click “Calculate” and enjoy the results.

C2C Calculator

Use the instructions above to make the most of this tool.

C2C Block Dimensions

Measure one little block of your corner-to-corner and put the dimensions below. To do that, make a 5×5 (5 C2C block by 5 C2C block) swatch with the same yarn, hook, stitch and tension you plan on using for the final blanket project. Block and measure the swatch, and divide each measurement by 5 to get the average block size.

Desired Final Blanket Dimensions

Here is where you need to decide on the final dimensions of your blanket. These can be chosen from our predefined list of standard blanket sizes, or you can type in your own custom numbers.


Corner-to-corner technique (abbreviated to C2C) is an intermediate crochet method based on basic stitches. It comprises interconnected little squares that grow in number diagonally, starting in the corner.

The pixelated style of this technique makes it easy to create colorful picture blankets (called graphgans). You can make very intricate designs – simply use individual blocks as pixels and change the colors in the right places.

If you want to learn how to C2C, our guide for beginners will set you on the right path. Learn about the basics of this fantastic technique in our article called How To Corner-To-Corner Crochet (C2C) For Beginners.

All you need to design your first corner-to-corner crochet project is:

  • squared notebook or a squared piece of paper
  • pen, pencil or crayons
  • yarn in two or more colors and an accordingly sized crochet hook

C2C graphs work like pixelated images, so you can easily design your own patterns. Treat each square on your paper as one pixel and color them to create a picture. Recreate shapes you know, or come up with totally unique designs.

Although technically you can crochet corner to corner with any yarn, medium-weight one will be the best for most projects. This technique is all about the patterns in the “tiles”, so you want them to be neither too big nor too small.

Remember to choose the right size of the crochet hook for your yarn. You can find recommended sizes on the yarn label or try out a few to see which works best. The size of the crochet hook and yarn weight highly impact the size of the final product.

The basic premise is the same as with other projects, so read our article about how to change colors in crochet.

Changing colors in C2C requires strictly following the pattern or a graph because the “pixel picture” will emerge only then.

Traditional crochet stitches are worked in rows or in the round, but C2C is worked diagonally. Instead of creating a row of uniform individual stitches, you make small squares. These little blocks comprise a turning chain and three double crochet stitches.

You can learn how to increase and decrease with the C2C method by reading our article called How To Corner-To-Corner Crochet (C2C) For Beginners.

If you are adding and decreasing C2C blocks evenly, you should end up with even edges.

There are a few ways to make them even nicer:

  • Block your finished crochet piece.
  • Add a border or an edging.
  • If you create a different shape than a square or a rectangle, smooth the edges on a diagonal with this tutorial by Clearly Helena on clearlyhelena.com.

Of course, you can make a bunch of amazing projects with this technique. There are C2C garments, such as cardigans and sweaters, but also accessories – shawls and scarves. Instead of making a big graphgan, you can create a smaller piece with a picture on it, and turn it into a pillow or a wall hanging.

Explore our selections of free crochet patterns in the last part of this article.

The process requires picking up stitches alongside the edges of the finished project, just like with other crochet projects.

No matter which border style you choose, you will have to work the right number of stitches along each side and add some in the corners. Depending on the style and complexity of the border, it may require crocheting for one or more rounds.

The unusual structure of corner-to-corner makes it easy for beginners to lose track of the pattern. Paying attention to the pattern instructions is crucial, especially if you are following a colorful graph.

Changing colors in the wrong places is a common mistake, as well as an incorrect placement of increases or decreases. Spend some time examining how this technique works and how the “pixel tiles” are placed.

Another common mistake is inconsistent tension or the wrong choice of materials and the crochet hook size. All of the above can result in the stitches that don’t look good – are either too tight or too loose.

Yes, this technique can be easily adapted for clothing and accessories – usually for winter. It requires adjusting the size of the squares and incorporating shaping techniques, but the result can be stunning.

If you are familiar with the technique and know how it’s built, what you follow is typically a chart or a graph. Some patterns include written instructions, too – beginners will find them more detailed and easy to follow.

Remember that to read a C2C pattern, you start at the bottom-right corner and work diagonally.

When it comes to streamlining the C2C process, you can consider using a larger crochet hook or chunky yarn. The project will have a unique look and will work up fast.

Another thing you can do is organize yarn colors and prep multiple smaller skeins of yarn. Working with color changes may be confusing, and fixing mistakes is much more time-consuming than prepping ahead of time.

Just like any other colorwork pattern, corner-to-corner results in a lot of yarn ends to weave in. After completing a project, weave in the ends using a yarn needle and make sure to secure them.

The most basic technique for hiding yarn ends includes threading the yarn tails through nearby stitches on the wrong side of the fabric. Remember to work in multiple directions to prevent unraveling, and trim any excess yarn.

How you care for the crochet pieces depends mostly on the materials you use, not the technique. Consult the yarn label to determine specific care instructions provided by the yarn manufacturer.

Most yarns should be washed by hand in lukewarm water and with a mild detergent. Do not wring or twist the fabric, but gently squeeze the water into the towel. Lay it flat to dry or block it by pinning it in place.

C2C Crochet Patterns for Every Crafter

You may now ask: What are some beginner-friendly corner-to-corner crochet patterns? Let us help you with that!

The curated selection of free crochet patterns here on Your Crochet will suit every skill level. No matter if you’re looking to create a simple baby blanket or tackle a larger project, you can dive into the variety of designs and styles. Explore our recommendations for corner-to-corner free patterns and personalize your space with colorful accessories.

A corner-to-corner crocheted baby blanket.

Great C2C Baby Blankets Free Crochet Patterns

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Various C2C Blanket Possibilities

Crochet animal blanket.

Animal C2C Blanket Ideas and Free Patterns

C2C Home Decor Ideas Free Crochet Patterns

C2C Home Decor Ideas

Versatile C2C Blankets

Versatile C2C Blankets

Two pictures of a crocheted parrot blanket.

Amazing C2C Square Free Crochet Patterns

Vintage Red Truck Harvest Pumpkin C2C Pillow

Decorative C2C Pillow Free Crochet Patterns

C2C Scarves Ideas and Patterns

C2C Scarf Ideas and Patterns