Hair Extensions Calculators
Extension quantity, weft measurements, tape-in planning, bond calculations, micro ring counts and colour matching tools.
Extension Quantity Calculator
Calculate the number of extension pieces needed for full or partial head coverage.
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.
Hair Weight Calculator
Estimate the total weight of extensions needed in grams for comfort and hold.
Colour Match Calculator
Plan extension colour blending with multiple shades for a seamless match.
8 free calculators in Hair Extensions
Hair Extensions — Types, Quantities and Application
Hair extensions have become one of the fastest-growing salon services in the UK. Choosing the right type, quantity and application method depends on the client's natural hair condition, desired result and maintenance commitment. Getting the quantities right is essential for a natural-looking result that blends seamlessly with the client's own hair.
For a full head of tape-in extensions, most clients need 40-60 pieces (20-30 sandwiches). Keratin bond extensions typically require 100-200 individual strands for a full head. Micro ring extensions use a similar quantity. The exact number depends on head size, natural hair density and the desired volume increase. Our calculators help you estimate accurately for each method.
Extension hair is typically sold by weight in grams. A full head application usually requires 100-200g of hair, with finer hair needing less and thicker hair needing more. Standard lengths range from 14" (35cm) to 24" (60cm). Colour matching is critical — many extension brands offer multi-tonal shades that blend more naturally than single-tone colours.