3% vs 6% Hydrogen Peroxide: Differences and Which to Choose

Hydrogen peroxide (H₂O₂) is a simple compound of hydrogen and oxygen that breaks down into water and oxygen. It is sold in different strengths, and the two most popular for home and professional use are 3% and 6%.

What do the percentages and "vols" mean?

The percentage is the amount of hydrogen peroxide in the solution. The "volume" figure describes how much oxygen it can release:

• 3% = 10 vol
• 6% = 20 vol

So 6% is twice as concentrated as 3%.

When to choose 3%

3% is the everyday strength. It is the one to reach for when you want a gentle cleaner around the home:

• Wiping kitchen worktops, chopping boards and fridge shelves
• Freshening sinks, grout and shower areas
• Lifting light stains on white fabrics (patch test first)
• Cleaning toothbrush holders and bathroom fittings

When to choose 6%

6% is stronger, so it suits tougher jobs and people who like to dilute to their own strength:

• Heavier staining on grout and white surfaces
• Laundry whitening boosts
• Diluting down to 3% (mix equal parts 6% and distilled water), which often works out cheaper per litre

At 6% wear gloves and avoid contact with eyes, as it can irritate skin and eyes more than 3%.

What "food grade" means

Food grade refers to the purity of the product and the absence of the stabilisers found in some pharmacy-grade peroxides. It does not mean it is for drinking. Never swallow hydrogen peroxide at any strength.

Safety basics

• Store in the original opaque bottle, somewhere cool and dark
• Never mix with vinegar, bleach or other cleaning products
• Hydrogen peroxide can bleach coloured fabrics and some surfaces, so test first

Shop: Hydrogen Peroxide 3% or Hydrogen Peroxide 6%, available from small bottles up to bulk sizes.