Colourists and barbers
Hair colour mixing ratio calculator.
Set the ratio from the colour line you use, tell it how much colour you have or how much mix you need, and read off the grams of developer.
Developer = colour x developer parts / colour parts. At 1:2, 60 g of colour needs 120 g of developer for a 180 g mix. At 1:1 it needs 60 g.
Your numbers
Result
Using the ratio
A ratio of 1:2 means one part colour to two parts developer, by weight. Mixing by weight on a scale is more repeatable than by eye, and it makes the cost of each application easy to track.
Choose either the colour you have (a full tube, say) or the total mix a service needs; if you fill in the total, the colour weight is ignored. The waste allowance covers what stays in the bowl and brush so your cost per client is not understated.
The correct ratio and developer strength come from the colour manufacturer for the specific line and the result wanted, so this tool leaves both to you. Price the service itself with the salon service price calculator.
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FAQ
How much developer do I need for a 1:2 mix?
Twice the weight of the colour. For 60 g of colour you need 120 g of developer.
What is the right colour to developer ratio?
It depends on the colour line, so follow the manufacturer's instructions for that product. This calculator takes whatever ratio you enter.
Why mix by weight?
Weighing gives the same ratio every time and lets you cost each client's colour. Volume markings on bowls vary.