Free tool
Wig Cap Size Finder
Most listings just say "average size". Measure your head, then see your cap size, whether average will fit you, and which wigs say they do.
Enter your head circumference to see your cap size. It's the one measurement that decides fit: a soft tape around your head along the front hairline, just above your ears and round the nape bone at the back, snug but not tight.
Cap sizes
| Size | Circumference | What it means |
|---|---|---|
| Small / petite | Around 21″ · 53–54 cm | Fewer listings are cut this small. Look for a stated range, adjustable straps, or ask the retailer. |
| Average / medium | Around 22–22.5″ · 55–58 cm | What almost every listing means by "average size". Straps add about an inch either side. |
| Large | 23″ and up · 59 cm and above | Up to about 23.5″, straps usually cover it. Beyond that, check before buying. |
How to measure
Use a soft tape, over flat hair or a wig cap, the way the wig will actually sit. Circumference is the one that matters most: around your head along the front hairline, above your ears, and round the nape bone at the back, snug but not tight. Our guide to measuring your head for a wig has diagrams for all three measurements, and what to do when a listing doesn't give a size.
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