What is developer volume?

Developer volume refers to the concentration of hydrogen peroxide in the oxidant. 10 vol (3%) deposits color without lift, 20 vol (6%) lifts 1-2 levels, 30 vol (9%) lifts 2-3 levels, and 40 vol (12%) lifts 3-4 levels. Higher volumes are more damaging to hair.

What is the standard mixing ratio?

Most permanent hair color uses a 1:1 ratio (equal parts dye and developer). Some brands use 1:1.5 or 1:2, and high-lift or bleach formulas often require 1:2. Always check your specific product instructions.

Can I use 40 vol to lift 5 levels?

No single application of permanent color can lift more than 3-4 levels safely. For dramatic lifts beyond that, you would need to bleach first, then tone. Using higher-volume developer beyond what is needed will not achieve more lift and will damage the hair.

Can I use 10 vol to cover gray hair?

Yes. 10 vol is ideal for covering gray hair when you do not want any lift — it deposits color without lightening the natural hair. For stubborn grays, some stylists prefer 20 vol for better gray coverage with slight lift.

What if I am going darker?

When depositing color darker than your current level, always use 10 vol. Higher volumes are unnecessary and can cause uneven results when going darker.

Are grams and milliliters the same for hair color?

For practical purposes, yes. Hair color and developer have a density very close to 1 g/ml, so milliliters and grams are interchangeable when measuring these products.

Hair Developer Volume Calculator

Name: Hair Developer Volume Calculator
Availability: InStock
Author: Nham Vu

Find the right developer volume (10, 20, 30, or 40 vol) and calculate exactly how much developer to mix with your hair dye based on your desired lift level.

Your Hair Details

Current Hair Level

Dark Brown

Target Hair Level

Dark Blonde

Hair Dye Amount (ml)

Mixing Ratio (Dye : Developer)

Results

20vol

Recommended Developer

20 Volume (6%)

Lifts 1–2 levels

Hair Dye

Developer

Total Mixture 120 ml

Hair Level Reference Chart (1–10)

Current level

Target level

Developer Volume Guide

Summary

Find the right developer volume (10, 20, 30, or 40 vol) and calculate exactly how much developer to mix with your hair dye based on your desired lift level.

How it works

Select your current hair level on the scale from 1 (black) to 10 (lightest blonde).
Select your target hair level — how light or dark you want the result.
Enter how many milliliters of hair dye you are using.
Choose your mixing ratio: 1:1, 1:1.5, or 1:2 (dye to developer).
The tool recommends the correct developer volume and shows the exact amount to mix.
Review the hair level reference chart to understand what each level looks like.

Use cases

Choosing between 20 vol and 30 vol developer for a multi-level lift.
Calculating developer amount for a root touch-up at home.
Confirming the correct oxidant strength before a salon appointment.
Scaling the developer quantity when using a 1:2 ratio for high-lift color.
Deciding whether 10 vol is sufficient for depositing color without lift.
Understanding how many levels of lift each developer volume provides.

Frequently Asked Questions

Last updated: 2026-07-22 · Reviewed by Nham Vu