How to Dilute 35% and 50% Food Grade Hydrogen Peroxide
To make 3% hydrogen peroxide from 35% food grade, mix 1 part 35% with about 10.7 parts water: that is 86ml of 35% topped up to 1 litre with water. For 6%, use 171ml of 35% per litre. The chart below covers 35%, 50% and 12% concentrates.
Food grade hydrogen peroxide dilution chart
| Start with | To make | Concentrate per 1 litre | Water per 1 litre | Ratio (approx.) |
|---|---|---|---|---|
| 35% | 3% | 86ml | 914ml | 1 : 10.7 |
| 35% | 6% | 171ml | 829ml | 1 : 4.8 |
| 50% | 3% | 60ml | 940ml | 1 : 15.7 |
| 50% | 6% | 120ml | 880ml | 1 : 7.3 |
| 12% | 3% | 250ml | 750ml | 1 : 3 |
| 6% | 3% | 500ml | 500ml | 1 : 1 |
Figures are by volume and rounded. The formula is: ml of concentrate per litre = 1000 x (strength you want / strength you have).
How to dilute it safely
- Wear chemical-resistant gloves and eye protection. 35% and 50% hydrogen peroxide burn skin and can blind.
- Use clean, cool distilled or deionised water. Tap water minerals make it break down faster.
- Measure the water into a clean HDPE plastic container first, then add the peroxide to the water. Never use metal.
- Label the container with the strength and date. Store it cool and dark with a vented cap.
- Keep concentrate locked away from children, and never store it in a drink bottle.
Is diluting worth it?
Concentrate looks cheaper per litre, but you need protective gear, distilled water, safe storage and accurate measuring, and home-diluted peroxide loses strength faster without a stabiliser. Forsana's 3% and 6% are already diluted with deionised water and stabilised, so they stay at strength.
Skip the gloves and maths. Our food grade hydrogen peroxide comes ready to use.
Food Grade Hydrogen Peroxide 3% (1L, $19.99) | Food Grade Hydrogen Peroxide 6% (1L, $24.99)
Need 50% food grade for trade, water treatment or food processing? See Forsana wholesale and trade.
FAQs
How do I make 3% hydrogen peroxide from 35%?
Add 86ml of 35% food grade hydrogen peroxide to 914ml of distilled water to make 1 litre of roughly 3%. That is a ratio of about 1 part to 10.7 parts water.
How do I dilute 50% hydrogen peroxide to 3%?
Add 60ml of 50% to 940ml of distilled water for 1 litre of roughly 3%.
Should I add water to peroxide or peroxide to water?
Put the water in first, then add the peroxide. Wear gloves and eye protection.
What water should I use?
Distilled or deionised water. Minerals in tap water speed up breakdown.
How long does diluted hydrogen peroxide last?
Home-diluted peroxide without a stabiliser can lose strength within weeks. Store it cool, dark and vented, and date the bottle.
Can I drink diluted food grade hydrogen peroxide?
No. Never drink hydrogen peroxide at any strength or dilution.