#c2c-calculator-app {
background: #fff;
padding: 25px;
border-radius: 8px;
box-shadow: 0 4px 8px rgba(0,0,0,0.1);
margin-bottom: 20px;
}
#c2c-calculator-app h2 {
text-align: center;
margin-bottom: 20px;
color: #333;
}
.c2c-input-group {
margin-bottom: 15px;
}
.c2c-input-group label {
display: block;
margin-bottom: 5px;
font-weight: bold;
color: #555;
}
.c2c-input-group input {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box;
}
#c2c-calculate-btn {
width: 100%;
padding: 12px;
background-color: #8a2be2;
color: white;
border: none;
border-radius: 4px;
font-size: 16px;
cursor: pointer;
margin-top: 10px;
}
#c2c-calculate-btn:hover {
background-color: #7b24c6;
}
#c2c-result {
margin-top: 20px;
padding: 15px;
background-color: #e9d8f9;
border: 1px solid #d1b3e6;
border-radius: 4px;
text-align: center;
font-size: 1.1em;
color: #333;
}
#c2c-result p {
margin: 8px 0;
}
.c2c-article-content h2, .c2c-article-content h3 {
color: #4a148c;
}
.c2c-article-content p, .c2c-article-content li {
line-height: 1.6;
color: #444;
}
function calculateC2C() {
var swatchWidth = parseFloat(document.getElementById('swatchWidth').value);
var swatchHeight = parseFloat(document.getElementById('swatchHeight').value);
var swatchYarn = parseFloat(document.getElementById('swatchYarn').value);
var projectWidth = parseFloat(document.getElementById('projectWidth').value);
var projectHeight = parseFloat(document.getElementById('projectHeight').value);
var resultDiv = document.getElementById('c2c-result');
if (isNaN(swatchWidth) || isNaN(swatchHeight) || isNaN(swatchYarn) || isNaN(projectWidth) || isNaN(projectHeight)) {
resultDiv.innerHTML = 'Please enter valid numbers in all fields.';
return;
}
if (swatchWidth <= 0 || swatchHeight <= 0 || swatchYarn <= 0 || projectWidth <= 0 || projectHeight <= 0) {
resultDiv.innerHTML = 'All values must be greater than zero.';
return;
}
var blocksForWidth = Math.ceil(projectWidth / swatchWidth);
var blocksForHeight = Math.ceil(projectHeight / swatchHeight);
var totalBlocks = blocksForWidth * blocksForHeight;
var totalYarn = totalBlocks * swatchYarn;
var resultHTML = 'Project Estimation Complete:' +
'Blocks for Width: ' + blocksForWidth + ' blocks' +
'Blocks for Height: ' + blocksForHeight + ' blocks' +
'Total Blocks Needed: ' + totalBlocks.toLocaleString() + ' blocks' +
'Estimated Total Yarn: ' + totalYarn.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}) + ' yards';
resultDiv.innerHTML = resultHTML;
}
C2C Project Calculator
What is a C2C Calculator?
A C2C (Corner-to-Corner) Calculator is a specialized tool designed for crocheters who love the C2C technique. It helps you accurately plan your project by estimating the number of blocks and the total amount of yarn you'll need based on a small sample, known as a gauge swatch. This eliminates guesswork, prevents you from running out of yarn mid-project, and ensures your final piece, whether it's a blanket, scarf, or graphgan, turns out exactly the size you envisioned.
Understanding Corner-to-Corner Crochet
Corner-to-Corner crochet is a unique technique where you build the fabric on a bias, starting from one corner and working your way diagonally to the opposite corner. Instead of working in traditional rows, you create a series of "blocks" or "tiles." This method is incredibly popular for creating pixelated designs (graphgans) and results in a beautifully textured, flexible fabric.
Why Use a C2C Project Calculator?
- Accurate Yarn Purchasing: The biggest challenge in large crochet projects is buying the right amount of yarn. This calculator gives you a reliable estimate, saving you money and the stress of hunting for a matching dye lot later.
- Precise Sizing: Ensure your baby blanket is actually baby-sized or your queen-sized afghan fits your bed. By starting with your desired dimensions, the calculator tells you how many blocks to crochet.
- Efficient Project Planning: Especially for complex graphgans with multiple colors, knowing the total block count helps you map out your design and estimate the yarn needed for each color section.
- Confidence to Start: Planning is half the battle. With a clear plan for materials and size, you can start your C2C project with confidence.
How to Use the C2C Project Calculator
To get an accurate estimation, you first need to create a small test piece. This is the most critical step!
- Create a Gauge Swatch: Using your chosen yarn and hook, crochet a small C2C square. A 3×3 or 4×4 block swatch is usually sufficient. Don't cut the yarn yet!
- Measure Your Swatch Block: Carefully unravel your swatch until you are left with just ONE C2C block. Lay it flat and measure its width and height. For a square block, these will be the same. Enter these values into the "Swatch Block Width" and "Swatch Block Height" fields.
- Measure the Yarn Used: Now, completely unravel that single block and measure the length of the yarn you used to create it. This is your yarn usage per block. Enter this into the "Yarn Used for Swatch" field.
- Define Your Project Size: Decide on the final dimensions for your project. For example, if you want a throw blanket that is 36 inches wide and 48 inches long, enter these values into the "Desired Project Width" and "Desired Project Height" fields.
- Calculate: Click the "Calculate Project Needs" button to see your results!
C2C Calculation Example
Let's say you want to make a stroller blanket for a baby shower. You want the final size to be 30 inches wide by 40 inches long.
You create a gauge swatch with your worsted weight yarn and H/5.00mm hook.
- After measuring a single block, you find it is 0.8 inches wide and 0.8 inches high.
- You unravel the block and measure the yarn, which comes out to 3 yards.
You would enter:
- Swatch Block Width: 0.8
- Swatch Block Height: 0.8
- Yarn Used for Swatch: 3
- Desired Project Width: 30
- Desired Project Height: 40
The calculator would determine:
- Blocks for Width: 38 (since 30 / 0.8 = 37.5, rounded up)
- Blocks for Height: 50 (since 40 / 0.8 = 50)
- Total Blocks Needed: 1,900 (38 x 50)
- Estimated Total Yarn: 5,700 yards (1,900 blocks x 3 yards/block)
Now you know you need to buy approximately 5,700 yards of yarn and your project will be 38 blocks wide by 50 blocks high.
Frequently Asked Questions (FAQ)
- What is a C2C "block"?
- A C2C block, also called a tile or square, is the basic unit of corner-to-corner crochet. It typically consists of a chain-3 and three double crochet stitches.
- How do I measure my gauge swatch accurately?
- It's best to measure a single, isolated block for the most precision. Creating a larger swatch (e.g., 4×4 blocks) and dividing the total size by 4 can also work, but measuring one block is often more direct. Always let your swatch rest and lay flat without stretching it.
- Can I use this calculator for C2C graphgans?
- Absolutely! This calculator is perfect for graphgans. Once you know the total number of blocks (e.g., 100 wide by 120 high), you can count the blocks of each color in your chart. This calculator helps you determine the total yarn needed for the entire project, which is a great starting point for buying your materials.