How do you calculate the resulting level of a colour mix?

The resulting level is the weighted average of the two shade levels based on their proportions. For a 50/50 mix of level 6 and level 8, the result is level 7. For a 75/25 mix, the result is weighted towards the dominant shade. This applies to the depth (darkness/lightness) only — tone direction is more complex.

Does mixing two shades always give an exact average?

The level calculation is a close estimate. In practice, underlying pigment, hair porosity and the specific pigment molecules in each shade can affect the exact result. The calculation gives you a reliable guide for formulation planning. Always do a strand test for critical colour work.

Can I mix more than two shades?

Yes, but it is generally best to limit mixes to two or three shades to keep the formula manageable and predictable. Each additional shade makes the result harder to predict. The total weight of all colour shades combined is then matched with the correct developer amount.

CutCalcs

Colour Depth Calculator — Mix Two Shades

Calculate the resulting depth level when mixing two colour shades together in any proportion.

Shade 1 Level

Shade 2 Level

Shade 1 Proportion

Shade 2 will be 50%

How We Calculate This

This calculator uses a weighted average formula to determine the resulting depth level when mixing two hair colour shades together.

The formula

Result level = (Level A x Proportion A) + (Level B x Proportion B)

For example, 50% of level 6 + 50% of level 8 = (6 x 0.5) + (8 x 0.5) = 3 + 4 = level 7.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always perform a strand test before chemical services.