Hair Dye Calculator & Hair Color Formula Scaler
Get exact color and developer amounts or scale a complete formula while preserving every proportion. No account required.
Calculate your hair color formula
Color and developer calculator
Choose what you know, select the manufacturer's mixing ratio, and calculate the exact mix.
How to use a hair dye mixing ratio
A ratio describes the amount of color compared with developer. At 1:1.5, every 1 part of color needs 1.5 parts developer.
Use the hair dye calculator when you know the color amount or the final bowl size you need.
Use the formula scaler when a bowl contains multiple shades, developers, boosters, or additives that must stay proportional.
Always follow the product manufacturer's instructions. Mixing ratios and safety requirements vary by product line.
Hair color calculator questions
How do I calculate a 1:1.5 hair color ratio?
Multiply the color amount by 1.5 to find the developer amount. For 30 grams of color, use 45 grams of developer for a 75-gram total mixture.
Can I calculate from the total amount I want?
Yes. Choose desired total mixture and the calculator splits that total into color and developer based on the selected ratio.
How do I convert grams and ounces?
One ounce equals approximately 28.35 grams. Changing the unit in this tool converts the amount without changing the physical quantity.
When should I use the formula scaler?
Use the scaler for formulas with several shades or additives. It changes every component by the same factor so the original proportions remain intact.