How heavy should hair extensions be?

A full head of extensions typically weighs 100-220g. For fine hair, keep below 120g to prevent strain. Medium hair can support up to 180g. Thick hair can handle up to 250g. The weight should be distributed evenly across multiple attachment points to avoid concentrated pulling on any one area.

Can heavy extensions cause hair loss?

Yes, extensions that are too heavy can cause traction alopecia — gradual hair loss caused by constant pulling on the follicles. This is most common around the hairline, temples and where clips or bonds are concentrated. Always stay within the recommended weight limit and take breaks between wearings if possible.

Does extension length affect weight?

Yes, longer extensions are heavier because there is more hair per strand. A 35cm (14") full set might weigh 120g while a 65cm (26") full set in the same density could weigh 200g+. This is why length should be considered alongside coverage when planning extensions for fine or fragile hair.

What is the difference between weight grades of extension hair?

Standard grade hair is lighter but may have thinner ends. Premium grade is fuller from root to tip and slightly heavier. Luxury or double-drawn hair has all strands cut to the same length, giving the fullest ends and heaviest weight per piece. Higher grades last longer but add more weight.

CutCalcs

Hair Weight Calculator — Extension Weight in Grams

Estimate the total weight of extensions needed in grams for comfort and hold.

Extension Length

20-75cm (8-30 inches)

Coverage

Natural Hair Density

Hair Quality

How We Calculate This

This calculator estimates total extension weight based on length, coverage area, hair density and quality grade, then compares it against safe weight limits for your hair type.

The formula

Total weight = Length x 2.5g/cm x Coverage factor x Density factor x Quality factor

Fine hair: max recommended 120g
Medium hair: max recommended 180g
Thick hair: max recommended 250g

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always perform a strand test before chemical services.