How many fusion bonds do I need for a full head?

A full head of fusion extensions typically requires 100-200 bonds depending on hair density and bond size. Fine hair may need 100-120, medium hair 140-160, and thick hair 180-200. Nano bonds require more individual bonds for the same coverage as standard bonds.

How long does a fusion bond application take?

Each bond takes approximately 1.5-3 minutes to apply. A full head of 150 standard bonds takes about 3-5 hours. Nano bonds take longer per bond. Factor in sectioning, colour matching and consultation time for total appointment duration.

How many glue sticks do I need?

Each standard keratin bond uses approximately 0.5 g of glue. A standard glue stick weighs 7-12 g, so one stick covers roughly 14-24 bonds. For a full head of 150 bonds, you will need approximately 10-12 glue sticks. Always have a few spares.

What is the difference between nano and standard bonds?

Nano bonds are about half the size of standard bonds, making them virtually undetectable. They are ideal for fine hair and hairline areas. However, they hold less hair per bond, so you need 40-50% more bonds for equivalent coverage. Standard bonds are faster to apply and hold more weight.

CutCalcs

Fusion Bond Calculator — Keratin Bond Count & Time

Calculate keratin bond count, placement time, and glue sticks for fusion extensions.

Coverage Level

Area of head to cover with extensions

Natural Hair Density

Density of the client natural hair

Hair Length

Client current hair length

Bond Size

Smaller bonds need more pieces for same coverage

How We Calculate This

Bond Count

Bonds = Base count x Density factor x Size factor

Application Time

Time = Bond count x Minutes per bond

Glue consumption is calculated from the bond count and glue weight per bond. Glue sticks needed is rounded up to whole sticks.

Frequently Asked Questions

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Last updated: March 2026

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