Wig Size Guide UK: How to Measure Your Head for the Perfect Fit

Last Updated: July 7, 2026

Wig Size Guide UK: How to Measure Your Head for the Perfect Fit

Correct wig sizing is one of the most effective ways to reduce returns, improve comfort and ensure a more natural fit. Use this guide to measure your head at home and find your UK wig size.

Petite Wigs Small Heads Large Heads All Wigs

Wig size guide measuring head circumference

01 Why Wig Size Matters

A wig that looks perfect online can feel uncomfortable, insecure or unnatural if the cap size does not match your head. Too tight, and it may cause pressure marks and headaches. Too loose, and it may shift, slip or require constant adjustment throughout the day.

Comfort

A well-fitted wig should feel snug but not tight, even during long wear. Pressure around the temples, forehead and nape is often a sign of incorrect sizing.

Security

The right size helps the wig stay in place during daily movement, making you feel more confident in wind, public spaces and everyday activities.

Natural Look

A correctly sized wig sits evenly against the hairline and follows the shape of your head, creating a more natural appearance.

02 What You Need to Measure

Simple Tools You’ll Need

A soft flexible tape measure
A mirror to check tape placement
A pen and paper to record measurements
Optional: a friend to help you measure

You do not need salon equipment to measure your head. Most people can get an accurate measurement at home in under five minutes.

03 How to Measure Your Head

Find Your Hairline

Start at the centre of your forehead, just above where your natural hairline begins. If you have experienced hair loss, use the position where you want the wig front to sit.

Wrap the Tape

Wrap the soft tape measure around the fullest part of your head, keeping it level and slightly above the ears. Do not pull the tape too tight.

Record Circumference

Read the measurement where the tape meets at the forehead. Write it down in inches, as most UK wig brands use inches for sizing.

Check Tension

The tape should be snug enough to stay in place, but you should still be able to fit one finger underneath comfortably.

Measure Again

To avoid mistakes, measure twice. If the two readings differ slightly, use the larger measurement when choosing your wig size.

Compare the Chart

Match your head circumference to the brand’s size chart. Remember that sizing can vary slightly between styles and cap constructions.

04 UK Wig Size Chart

UK Wig Size Chart: Petite, Average, Large

Wig Size	Head Circumference	Best For
Petite	20.5" – 21.5"	Small head sizes, teenagers, petite adults
Average	22" – 23"	Most adults, standard fit
Large	23.5" – 24.5"	Larger head sizes, thick hair underneath

This table is a general guide. Always check the individual product description for brand-specific sizing notes before ordering.

05 What If You're Between Sizes?

Important Tip: If your measurement falls between two sizes, it is usually safer to size up rather than down. Adjustable straps at the nape can often be used to tighten a slightly larger cap, but a cap that is too small will feel uncomfortable even after adjustment.

Check whether the cap has adjustable straps.
Look for stretchy nape bands or flexible wefts.
Read product notes about whether the style runs small, true to size or generous.
If you wear thick hair underneath, you may need extra room.

06 Adjustable Straps and How They Help

How Adjustable Straps Improve Fit

Most modern wigs include adjustable straps at the nape. These allow you to loosen or tighten the cap circumference after receiving the wig, making standard sizes more forgiving.

Tighten if the wig feels loose or slips forward.
Loosen if the wig feels too tight or causes pressure marks.
Do not rely on straps to fix a cap that is fundamentally too small.

07 Wigs for Small Heads and Large Heads

Wigs for Small Heads

If your head circumference is 21.5 inches or less, average wigs may feel too loose, sit too far back or look unnatural around the hairline.

Shop Small Heads

Wigs for Large Heads

If your head circumference is 23.5 inches or more, average wigs may feel tight across the forehead, temples and nape, especially during long wear.

Shop Large Heads

You can also browse our petite wigs collection for smaller head sizes and our full all wigs range for standard and larger fits.

08 Frequently Asked Questions

Q1: How do I know what size wig to buy?

A: The best way is to measure your head circumference with a soft tape measure, then compare your measurement to the brand’s wig size chart. Standard UK sizes are usually petite, average and large.

Q2: What is the average wig size in the UK?

A: The average wig size in the UK is typically 22 to 23 inches in head circumference, which fits most adults with standard head sizes.

Q3: Can I wear an average wig if I have a small head?

A: You may be able to if the cap has adjustable straps, but average wigs can still feel loose or sit incorrectly on very small heads. For a more reliable fit, explore our wigs for small heads.

Q4: What if my wig is too tight?

A: First, loosen the adjustable straps at the nape. If it still feels uncomfortable, the cap may be too small for your head size.

Q5: What if my wig is too loose?

A: Try tightening the adjustable straps. You can also use a wig grip band or tape for extra security, but this will not fix a fundamentally ill-fitting cap.