Enter the desired amounts of dye and developer along with their respective ratios into the calculator to determine the missing value.

Hair Dye Ratio Calculator
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Permanent color mixes 1:1 with developer.

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Hair Dye Ratio Formula

The following formula is used to calculate the desired amount of dye or developer based on their ratios. 

D = (V / R_d) * R_h

Variables:

  • D is the desired amount of dye
  • V is the desired amount of developer
  • R_d is the developer ratio
  • R_h is the dye ratio

To calculate the desired amount of dye, divide the desired amount of developer by the developer ratio and then multiply by the dye ratio.

What is a Hair Dye Ratio?

A hair dye ratio refers to the proportion of hair dye to developer that should be mixed together to achieve the desired hair color. The ratio is typically specified by the manufacturer and can vary depending on the type of dye and the desired intensity of the color. Common ratios include 1:1, 1:1.5, and 1:2, where the first number represents the amount of dye and the second number represents the amount of developer. Mixing the correct ratio is crucial for achieving consistent and predictable results.

How to Calculate Hair Dye Ratio?

The following steps outline how to calculate the Hair Dye Ratio.

  1. First, determine the desired amount of dye (D).
  2. Next, determine the desired amount of developer (V).
  3. Next, determine the developer ratio (R_d).
  4. Next, determine the dye ratio (R_h).
  5. Finally, calculate the missing value using the formula D = (V / R_d) * R_h.
  6. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Desired amount of dye (D) = 50 ml

Desired amount of developer (V) = 75 ml

Developer ratio (R_d) = 1.5

Dye ratio (R_h) = 1