How many hair extensions do I need?

For a full head of tape-in extensions, typically 40-50 pieces (20-25 sandwiches). For keratin bonds or micro rings, 100-200 strands. Clip-in sets usually come with 7-10 wefts. The exact number depends on desired coverage, natural hair density and the extension method used.

What extension method is best?

Tape-ins are the most popular for salon use — quick to apply, gentle on hair, and last 6-8 weeks before repositioning. Keratin bonds last 3-4 months but take longer to fit. Micro rings are heat-free. Clip-ins are temporary and great for special occasions. Sew-in wefts suit afro-textured hair well.

How much do hair extensions weigh?

A full head of tape-in extensions weighs approximately 120-180g. Keratin bonds total 100-200g. The weight should feel comfortable and not pull on the natural hair. Heavier extensions can cause traction alopecia over time, so it is important not to overload fine or fragile hair with too much weight.

How long does extension fitting take?

Tape-in extensions take 45-90 minutes for a full head. Keratin bond fitting takes 2-4 hours. Micro ring fitting takes 3-5 hours. Clip-ins take 10-15 minutes to self-apply. Sew-in wefts take 1-2 hours. Always allow extra time for consultation, colour matching and blending cuts.

CutCalcs

Extension Quantity Calculator — How Many Pieces Needed

Calculate the number of extension pieces needed for full or partial head coverage.

Extension Method

Coverage

Natural Hair Density

Extension Length

Cost Per Piece

Optional — per extension piece

How We Calculate This

This calculator estimates the number of extension pieces needed based on the fitting method, desired coverage, natural hair density and extension length.

The formula

Pieces = Method base x Coverage factor x Density factor x Length factor

Total weight = Pieces x Weight per piece

Tape-ins: ~40 pieces base (20 sandwiches)
Keratin bonds: ~150 strands base
Fine hair needs fewer pieces, thick hair needs more

Frequently Asked Questions

Related Calculators

Weft Length Calculator

Determine weft lengths and quantities needed for sew-in or clip-in extensions.

Tape-In Calculator

Calculate tape-in extension quantities for different coverage levels and head sizes.

Bond Calculator

Estimate the number of keratin bonds needed for fusion extension applications.

Micro Ring Calculator

Calculate micro ring quantities and extension strands for micro loop fitting.

Clip-In Calculator

Determine clip-in weft sizes and piece counts for a natural-looking result.

Last updated: February 2026

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