How to measure a crochet tension square (gauge swatch) – the right way

What Is a Crochet Tension Square?

A tension square is a small sample of crochet fabric made using the same:

• Yarn
• Hook size
• Stitch pattern

as your real project. The goal is to compare your stitch size to the pattern’s gauge, so your finished item comes out the correct size.

Step 1: Make a Swatch Bigger Than the Gauge

If your pattern says something like:

10 cm x 10 cm (4" x 4") = 20 stitches x 16 rows

Don’t crochet a swatch that’s exactly 10 cm. Instead, make it bigger—at least:

• 12–15 cm (5–6 inches) wide
• 12–15 cm tall

Measuring in the centre of a larger swatch is much more accurate because edge stitches can be tighter or looser.

Step 2: Finish the Swatch Properly

• Fasten off your yarn
• Gently lay the swatch flat

If the pattern recommends blocking (common for garments), block your swatch the same way you’ll block the finished item and let it dry completely.
Gauge should be measured in the final state of the fabric.

Step 3: Use the Right Tools

• A firm ruler or measuring tape
• Optional: stitch markers, T-pins, or a stitch counter

Avoid bendy rulers, as they can distort your measurements.

Step 4: Measure Stitches (Width)

1. Place your ruler across the centre of the swatch.
2. Measure 10 cm (or 4 inches) horizontally.
3. Count how many full stitches fit within that space.
4. Ignore partial stitches at the edges.

Write your stitch count down so you can compare it with the pattern gauge.

Step 5: Measure Rows (Height)

1. Turn your ruler vertically in the centre of the swatch.
2. Measure 10 cm (or 4 inches) from bottom to top.
3. Count the number of rows within that space.
4. Do not count turning chains unless the pattern specifically tells you to.

Record your row count as well.

Step 6: Compare With the Pattern Gauge

Compare your stitch and row counts with the gauge listed in the pattern.

If your gauge matches

You’re ready to start your project with confidence.

If you have too many stitches

• Your tension is likely too tight
• Try using a larger hook

If you have too few stitches

• Your tension is likely too loose
• Try using a smaller hook

Always make a new swatch after changing hook size.

Extra Tips for Accurate Gauge

• Crochet your swatch naturally—don’t force your tension.
• Recheck gauge if you change yarn brand, hook material, or stitch pattern.
• Gauge is especially important for garments and fitted items.

Why Gauge Matters

Skipping gauge can result in garments that don’t fit, blankets that turn out much larger or smaller than expected, or running out of yarn too early.
A small swatch now can save a lot of time later.

Final Thoughts

Measuring a crochet tension square isn’t about perfection—it’s about confidence.
Once you understand your own tension, patterns become easier, sizing becomes predictable, and crochet becomes more enjoyable.