Crochet Hair Calculator

How the number of crochet hair packs is worked out

Crochet hair is sold by the pack, but what matters is how many strands or pieces end up on your head. The calculator starts from the number a full head usually takes for each style, adjusts it for the look and the head size, and then divides by what your pack actually holds.

strands needed = full-head strands × fullness × head size   (shown as ±10%)
packs needed   = strands needed ÷ strands per pack, rounded up
packs to buy   = top of the range + 1 spare
cost           = packs × price per pack

Full-head numbers by style

Pre-looped passion twists are chunky, so a natural full head takes around 84 strands. Thinner pre-looped box braids need about 130. Loose curly, water wave and straight hair spreads out and covers more scalp per piece, so about 80 pieces is typical. These starting numbers are rules of thumb based on what stylists commonly quote, not measurements, and the table below lists them for every style.

Fullness and head size

A full look adds 20% more hair and extra full adds 40%. Head size follows scalp area, which grows with the square of the circumference: a small head (about 21 inches) needs around 9% less hair than a medium one, and a large head (about 23 inches) about 9% more.

Why packs are a range

Two stylists will space the same hair differently, so the strand count is given as a range and both ends are rounded up to whole packs. The recommendation is the top of that range plus one spare. If you enter a price, the cost runs from the fewest packs that could work to the number the calculator suggests buying. Prices are whatever you type in — the tool does not know what your store charges.

Cornrow base and time

Individual-look styles need more cornrows so the parts look believable; loose hair hides the base and needs fewer. Install time adds 30–60 minutes for the base to roughly a minute per strand. Whatever the count, the base must not hurt: tight cornrows under added hair are a known cause of thinning at the hairline.

What the calculator cannot tell you

It does not know the length or thickness of the strands in your pack, how dense your own hair is, or how your stylist likes to space the hair. If you are braiding loose hair in rather than looping it on, use the braiding hair calculator, and plan the removal with the protective style takedown date tool.