How to Measure Your Head for a Wig (Cap Size Guide)
A wig that fits well looks more natural and feels more comfortable. Learn how to measure your head in six steps, read a wig cap size chart and adjust a wig for a secure fit.
Fit is the secret behind a wig that looks natural and stays comfortable all day. A cap that is too tight can cause headaches and pressure at the hairline; one that is too loose can slide, lift at the edges or show gaps behind the ears. The good news: measuring your head takes about five minutes and a soft measuring tape.
This guide shows you how to take each measurement, how to read a typical wig cap size chart and how to fine-tune the fit once your wig arrives. If you are still choosing a style, start with our beginner guide to choosing your first wig.
What you need
- A soft, flexible measuring tape (a sewing tape works well).
- A mirror, or a friend to help.
- A pen and paper or your phone to note the numbers.
- Your hair prepared the way you will wear it under the wig: braided, flattened or under a wig cap.
That last point matters. Thick braids add volume, so always measure with your hair styled as it will be under the wig.
The six key measurements
1. Circumference
This is the most important number. Place the tape at the front hairline in the middle of your forehead, run it just above the ear, around the back of the head at the nape where the hair starts, over the other ear, and back to the starting point. Keep the tape snug but not tight.
2. Front to nape
Measure from the hairline in the middle of your forehead, straight over the top of the head, to the nape of the neck where your hair ends.
3. Ear to ear across the forehead
Measure from the top of one ear to the top of the other, following the hairline across the forehead.
4. Ear to ear over the top
Measure from the top of one ear, over the crown of your head, to the top of the other ear.
5. Temple to temple around the back
Measure from one temple, around the back of the head at its widest point, to the other temple.
6. Nape of neck
Measure the width of your hairline at the nape, from one side to the other.
Write each number down in inches; most wig brands in the United States and Canada use inches. If your tape is in centimeters, divide by 2.54.
Typical wig cap size chart
Sizes vary slightly between brands, so always check the size chart of the specific wig you buy. As a general reference:
| Cap size | Head circumference (approx.) |
|---|---|
| Small | About 21 to 21.5 inches |
| Average / Medium | About 22 to 22.5 inches |
| Large | About 23 to 23.5 inches |
Most ready-made wigs are sold in the average size, with adjustable straps that allow a little flexibility. If your circumference is between two sizes, the adjustable straps usually let you go slightly smaller; going larger is harder, so in doubt consider the bigger size and tighten it.
How to adjust a wig for a secure fit
- Adjustable straps: most caps have elastic straps with hooks at the back. Tighten or loosen them evenly on both sides.
- Combs and clips: small combs sewn inside the cap grip your braids or wig cap.
- Elastic band: many glueless wigs include a band that sits across the back of the head for extra hold.
- Wig grip band: a soft velvet band worn under the wig adds friction and comfort, especially for sensitive scalps.
- Sewing in an elastic: some wearers sew an elastic band from ear to ear inside the cap for a snug, glueless fit.
Signs your wig does not fit
| Problem | Likely cause | Fix |
|---|---|---|
| Headache or pressure | Cap too small or straps too tight | Loosen straps; consider a larger cap |
| Wig slides back | Cap too large or no grip | Tighten straps, add a grip band or elastic |
| Lace lifts at the front | Poor placement or loose fit | Reposition and secure the front; check front-to-nape length |
| Gaps behind the ears | Ear tabs misaligned | Align ear tabs with the top of your ears |
| Wefts visible at the nape | Cap too short front to nape | Try a cap with a longer front-to-nape measurement |
Fit and cap type
Different cap constructions fit differently. Lace front and full lace caps often stretch slightly, while machine-made caps are firmer. Glueless wigs depend more on a precise fit, because they rely on straps and combs instead of adhesive. Learn more in our guide to lace front, full lace and glueless wigs.
Tips for a natural-looking placement
- Place the wig a little above your natural hairline, about a finger width, so the lace blends smoothly.
- Align the ear tabs just in front of your ears.
- Pull the wig down at the nape so it sits snugly.
- Check the center part is aligned with your nose.
- Adjust straps before securing the front.
Choosing a wig online with confidence
When you shop online, compare your circumference with the brand’s chart, read reviews mentioning fit and check the return policy for wigs that do not fit. Many shoppers keep their measurements saved on their phone. You can then compare cap sizes and styles easily on WigBae, our sister wig shop.
Once your wig fits perfectly, keep it in shape with the right routine; see our wig care guide. And if you are still deciding on the fiber, read human hair vs synthetic wigs.
Frequently asked questions
What is the most common wig cap size?
The average or medium size, around 22 to 22.5 inches in circumference, fits a large share of adults and is the default size for most ready-made wigs.
Should I measure with braids?
Yes. Measure with your hair prepared exactly as it will be under the wig, because braids can add noticeable volume.
Can I make a wig smaller?
Yes, within limits. Adjustable straps, a sewn-in elastic band or a wig grip can tighten the fit. Making a wig significantly larger is much harder.
Do wig sizes differ between brands?
Slightly. Always check each brand’s size chart instead of relying on a single standard.
Size ranges are general guidelines; always follow the size chart of the specific wig you buy.
