Hair Developer Ratio Calculator

⚠️ Important Safety Information

Hair chemicals can cause skin irritation, allergic reactions, and hair damage. Always:

• Do a patch test 48 hours before use to check for allergic reactions
• Follow manufacturer instructions exactly
• Work in a well-ventilated area
• Wear gloves and protect skin and clothing
• Never leave products on longer than recommended
• Rinse thoroughly if skin contact occurs
• Keep products away from eyes
• Consult a professional if unsure

How This Tool Works

This calculator determines the exact amounts of product (bleach, dye, or toner) and developer needed based on your desired mixing ratio and total amount. The ratio represents the proportion of product to developer. For example, a 1:2 ratio means 1 part product to 2 parts developer. The calculator divides your total needed amount proportionally: for a 1:2 ratio and 300g total, you need 100g product and 200g developer (1 part + 2 parts = 3 total parts; 300g ÷ 3 = 100g per part).

Always follow your specific product manufacturer's instructions, as ratios can vary by brand, product type, and desired result. Different ratios produce different effects: 1:1 ratios provide maximum processing power, 1:2 ratios are standard for most applications, and 1:3 ratios provide gentler processing. The calculator ensures you get the exact amounts needed for your specific ratio, which is critical for proper chemical reaction and successful hair coloring or bleaching results.

Common Mixing Ratios

• 1:1 Ratio: Equal parts product and developer - strong lift, maximum processing
• 1:2 Ratio: One part product, two parts developer - standard ratio, most common
• 1:3 Ratio: One part product, three parts developer - gentle processing, less lift
• Custom Ratios: Some products require specific ratios - always check manufacturer instructions

Note: Ratios vary by product type, brand, and desired result. Always check your specific product's instructions before mixing. Using incorrect ratios can result in poor results or damage.

FAQ

• What ratio should I use for bleach?
  Common bleach ratios: 1:1 for maximum lift (strong), 1:2 for standard lift (most common), 1:3 for gentle lift. Always follow your specific bleach powder manufacturer's instructions, as different brands may have different recommendations.
• What ratio should I use for hair dye?
  Most permanent hair dyes use 1:1 or 1:2 ratio (dye to developer). Semi-permanent dyes may not need developer. Always check the specific product instructions, as ratios vary by brand and developer volume (10, 20, 30, 40 volume).
• What is developer volume?
  Developer volume (10, 20, 30, 40) indicates the strength/oxidation level. Higher volume = more lift but more damage. 10 volume = deposit only, 20 volume = slight lift, 30 volume = moderate lift, 40 volume = maximum lift. Choose based on desired result and hair condition.
• Can I mix different ratios?
  Always follow manufacturer instructions. Different products are formulated for specific ratios. Using wrong ratios can result in poor color, damage, or ineffective processing. Never guess - check product instructions.
• How do I measure accurately?
  Use a digital scale to measure by weight (grams) for accuracy. Volume measurements (cups, tablespoons) are less accurate. Mix in a non-metallic bowl using a non-metallic applicator brush. Mix until smooth and consistent.