When shopping for hair extensions, one of the most common questions customers ask is how bundle lengths are measured.

Many people are surprised when their curly or wavy bundles look shorter than straight hair of the same length. This is completely normal and happens because of curl shrinkage.

In this guide, you'll learn:

• How hair bundles are measured
  
  

• Why curly hair appears shorter
  
  

• How to measure bundles correctly
  
  

• How to choose the right bundle length
  
  

If you're unsure which texture works best for you, take our Find Your Perfect Texture Quiz to get personalized recommendations.

How Are Hair Bundles Measured?

Hair bundles are measured from the top of the weft to the longest strand of hair when the hair is fully stretched straight.

This method is used across the hair industry for all textures including:

• Straight hair
  
  

• Body wave
  
  

• Loose wave
  
  

• Deep wave
  
  

• Curly textures
  
  

Browse our premium:

• Straight Hair Bundles
  
  

• Body Wave Hair Bundles
  
  

• Deep Wave Hair Extensions
  
  

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How to Measure Straight Hair Bundles

Straight hair is the easiest texture to measure because it has no shrinkage.

Step 1

Lay the hair bundle flat on a surface.

Step 2

Place a measuring tape at the top of the weft.

Step 3

Measure straight down to the longest strand at the bottom.

The number of inches you measure is the bundle length.

For example:

• 16 inches = shoulder length
  
  

• 20 inches = mid back
  
  

• 24 inches = lower back
  
  

Explore our Straight Bundle Collection to see available lengths.

How to Measure Curly or Wavy Hair Bundles

Curly and wavy textures must be gently stretched before measuring.

Because curls coil and bend, the hair appears shorter when worn naturally.

For example:

• 22 inch deep wave hair may look closer to 18–20 inches when curly.
  
  

• 24 inch kinky curly hair may appear shorter until stretched.
  
  

To measure curly bundles properly:

1. Hold the bundle from the weft
   
   

2. Stretch the hair straight
   
   

3. Measure from top to bottom
   
   

You can browse our:

• Loose Wave Bundles
  
  

• Deep Wave Bundles
  
  

• Curly Hair Extensions
  
  

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Why Curly Hair Looks Shorter

Curly textures experience something called shrinkage.

Shrinkage happens because curls naturally coil upward instead of hanging straight.

Here’s a general comparison:

Straight Hair – No shrinkage
Body Wave – Slight shrinkage
Loose Wave – Moderate shrinkage
Deep Wave – Noticeable shrinkage
Kinky Curly – Highest shrinkage

If you prefer longer-looking hair, consider body wave or straight textures.

Explore our Shop by Texture Collection to compare styles.

How Many Bundles Do You Need Based on Length?

Longer hair requires more bundles for a full look.

12–18 inches

2 to 3 bundles

20–24 inches

3 bundles recommended

26–30 inches

4 bundles for fullness

If you're looking for maximum volume, consider higher density wigs such as:

• 150% density
  
  

• 180% density
  
  

Read our guide on 130% vs 150% vs 180% Wig Density to learn more.

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How to Choose the Right Bundle Length

Hair length can appear different depending on your height.

For women around 5'0–5'3

18 inches = mid back
22 inches = lower back
26 inches = waist length

For women around 5'4–5'7

18 inches = shoulder blade
22 inches = mid back
26 inches = lower back

For women 5'8 and taller

24 inches or longer usually creates the most dramatic length.

When choosing bundle lengths, always consider:

• Your height
  
  

• Your curl pattern
  
  

• Your desired hairstyle
  
  

Bundle Length vs Wig Length

Hair bundles and wigs are measured the same way — from the top to the ends when stretched straight.

However wigs may appear slightly shorter depending on:

• curl pattern
  
  

• density
  
  

• layers in the style
  
  

Explore our premium:

• HD Lace Wigs
  
  

• Glueless Wigs
  
  

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Common Bundle Measurement Mistakes

Many first-time buyers make simple mistakes when choosing hair length.

Avoid these common errors:

• Measuring curly hair without stretching it
  
  

• Assuming curly hair will look the same length as straight hair
  
  

• Ignoring shrinkage when choosing textures
  
  

• Choosing too few bundles for long lengths
  
  

Understanding how hair bundles are measured helps you choose the perfect extensions for your desired look.

FAQ: Measuring Hair Bundles

Are hair bundles measured in inches?

Yes, bundle lengths are measured in inches from the weft to the longest strand when stretched.

Why does curly hair look shorter than straight hair?

Because curly hair has shrinkage and coils upward.

Is body wave measured the same as straight hair?

Yes. All hair textures are measured stretched straight.

How many bundles do I need for a full sew-in?

Most styles use 3 bundles, while longer lengths (26 inches and above) usually require 4 bundles.