What does a 1:2 ratio mean?

A 1:2 ratio means one part hair color to two parts developer. For example, if you want 90 ml total, you would use 30 ml of color and 60 ml of developer.

Which ratio should I use?

Most standard permanent dyes use a 1:1 or 1:2 ratio. Lighter developers (10 or 20 vol) often use 1:1, while high-lift or bleach formulas may call for 1:2. Always follow your specific product's instructions.

Can I use grams instead of milliliters?

Yes. Hair color and developer have a density close to 1 g/ml, so grams and milliliters are nearly interchangeable for mixing purposes. This calculator treats them as equivalent.

How much mixture do I need for a full head?

A full-head application typically requires 60–120 ml of total mixture depending on hair length and thickness. Short hair: ~60 ml; medium hair: ~90 ml; long or thick hair: 120 ml or more.

What if my ratio is not listed (e.g. 1:3)?

Use the custom ratio fields to type in any ratio you need. The tool supports any numeric ratio, including uncommon ones like 1:3 for bleach or toner applications.

Hair Dye Mixing Ratio Calculator

Name: Hair Dye Mixing Ratio Calculator
Availability: InStock
Author: Nham Vu

Enter your total volume and dye-to-developer ratio to get the exact amounts of hair color and developer to mix.

Mixing Details

Total Mixture Volume

Dye : Developer Ratio

Dye parts

Developer parts

Results

Enter your values and click Calculate

Common Ratios Reference

Ratio	Color %	Developer %	Typical use
1 : 1	50%	50%	Deposit / dark shades
1 : 1.5	40%	60%	Standard permanent
1 : 2	33%	67%	Lightening / high-lift
1 : 3	25%	75%	Bleach / toner

Summary

Enter your total volume and dye-to-developer ratio to get the exact amounts of hair color and developer to mix.

How it works

Enter the total volume of the mixture you need (e.g. 60 ml).
Select or enter the dye-to-developer ratio (e.g. 1:1.5 means 1 part color to 1.5 parts developer).
Choose your preferred unit of measurement: milliliters, fluid ounces, or grams.
The calculator instantly shows how much hair color and developer to use.
Use the result card to measure each ingredient before mixing.

Use cases

Mixing a single hair color application at home.
Scaling up for full-head coloring at a salon.
Working with multiple color ratios in one session.
Verifying package instructions when the math is unclear.
Calculating amounts for a root touch-up vs. full coverage.
Converting between milliliters and fluid ounces for imported products.

Frequently Asked Questions

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