Hair color mixing calculator
Type each shade and how much of it goes in, pick the ratio, and see how much developer to add.
How to use it
- Shades: one line per tube, with its amount. The name is optional; it only goes in the formula line.
- Ratio: color to developer. 1:1.5 means one and a half parts developer for each part of color.
- Grams or ounces: pick the one your scale shows. Switching converts what you typed (1 oz is 28.35 g).
- Amounts take a point or a comma: 7.5 and 7,5 both work.
Which ratio?
The ratio is on the color's box or the brand's chart, and it changes from one line to the next. Many permanent colors mix 1:1, some lines and many demi-permanents 1:1.5 or 1:2, and lighteners are often 1:2. When the brand says something else, follow the brand.
Keep the formula for next time
Hairnotes is a client notebook on your phone. Each visit gets its own note with a formula field, so the shades, developer and ratio you mixed today are there at the next visit, next to the photo and the price. How to write down a color formula shows what to put in it.
It runs in the browser on your phone, tablet or laptop, with nothing to download. It's free for up to 100 clients.