How to Dilute 6% Hydrogen Peroxide to 3% (and Other Strengths)

Buying 6% hydrogen peroxide and diluting it yourself is a cost-effective way to make everyday 3% strength, and lets you mix other strengths as needed.

What you need

• 6% hydrogen peroxide
• Distilled water. Tap water minerals can speed up breakdown.
• A clean measuring jug
• A clean, opaque, labelled bottle
• Gloves

The formula

To halve the strength, mix equal parts peroxide and water. More generally:

Parts of 6% = target % ÷ 6. The rest is water.

Dilution table (from 6%)

Step by step

1. Put on gloves.
2. Measure the water into the bottle first.
3. Add the peroxide.
4. Cap loosely, swirl gently and label with the strength and date.

Storage

Diluted peroxide breaks down faster than concentrated, so mix small amounts and use within a few weeks. Keep it in an opaque bottle, somewhere cool and dark.

Safety

• Avoid eyes and skin, especially with 6%
• Never mix with bleach, vinegar or other cleaners
• Never drink it, and keep away from children