Hair Color Conversion
Convert a color amount when switching developer volumes.
About Hair Color Conversion
The color amount is scaled by the ratio of the original to the new developer volume to match the recipe. Switching developer volume without adjusting changes lift and tone, so a quick conversion keeps results predictable.
Formula
Hair Color Conversion
Adjusted = color amount x (from vol / to vol)
- conversion ratio
- Factor for moving between developer strengths
Worked example
With the default values below, Hair Color Conversion returns Adjusted Amount of 2.00. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Color amountminimum 0.1 oz
- 1 oz
- From volumeone of 10 vol, 20 vol, 30 vol, 40 vol
- 20 vol
- To volumeone of 10 vol, 20 vol, 30 vol, 40 vol
- 10 vol
Results
- Adjusted Amount
- 2.00 oz
- Conversion Ratio
- 2.00
- Note
- Stronger lift; watch processing time
Step by step
- 1Values used
- 2Hair Color Conversion
- 3Adjusted Amount= 2.00 oz
- 4Conversion Ratio= 2.00
- 5Note= Stronger lift; watch processing time
Assumptions and limits
- The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Hair Color Conversion calculated?
Adjusted = color amount x (from vol / to vol) The color amount is scaled by the ratio of the original to the new developer volume to match the recipe.
Why does Hair Color Conversion matter?
Switching developer volume without adjusting changes lift and tone, so a quick conversion keeps results predictable.
What values do I need to enter?
This calculator takes 3 inputs: Color amount, From volume, To volume. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.