My Chemical-Free House

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Dilution Table for Hydrogen Peroxide

Published: March 19, 2020 |
Table of contents

How to Dilute 35%, 34% or 29%, 12%, 10%, and 6% Hydrogen Peroxide (H2O2) Down to 3%, 1%, 0.5%, 0.2% and 0.1%

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Dilution Table

Dilute 35% Hydrogen Peroxide

1 part 35% H2O2 to 1 part water (math is 35/2) = 17.5% Hydrogen Peroxide

1 part 35% H2O2 to 2 parts water is 35/3 = 11.7% Hydrogen Peroxide

1 part 35% H2O2 to 3 parts water is 35/4 = 8.75% Hydrogen Peroxide

1 part 35% H2O2 to 4 parts water is 35/5 = 7% Hydrogen Peroxide

1 part 35% H2O2 to 5 parts water is 35/6 = 5.83% Hydrogen Peroxide

1 part 35% H2O2 to 6 parts water is 35/7 = 5% Hydrogen Peroxide

1 part 35% H2O2 to 7 parts water is 35/8 = 4.4% Hydrogen Peroxide

1 part 35% H2O2 to 8 parts water is 35/9 – 3.9% Hydrogen Peroxide

1 part 35% H2O2 to 9 parts water is 35/10 = 3.5% Hydrogen Peroxide

1 part 35% H2O2 to 10 parts water is 35/11 = 3.18% Hydrogen Peroxide

1 part 35% H2O2 to 13 parts water is 35/14 = 2.5% Hydrogen Peroxide

1 part 35% H2O2 to 34 parts water is 35/35 = 1% Hydrogen Peroxide

1 part 35% H2O2 to 69 parts water is 35/70 = 0.5% Hydrogen Peroxide

Another way to make 1 gallon of 3% Hydrogen Peroxide: Mix 1 and a quarter cup of 35% HP with 14 and three quarter cups of water.

Dilution Table

Dilute 34% Hydrogen Peroxide

1 part 34% H2O2 to 4 parts water = 6.8% Hydrogen Peroxide

1 part 34% H2O2 to 4.5 parts water = 6% Hydrogen Peroxide

1 part 34% H2O2 to 8 parts water = 3.7% Hydrogen Peroxide

1 part 34% H2O2 to 9 parts water = 3.4 % Hydrogen Peroxide

1 part 34% H2O2 to 10 parts water = 3% Hydrogen Peroxide

Make 1 gallon of 3% Hydrogen Peroxide: Mix just a touch under 1.5 cups 34% HP with 14.5 cups of water.

Dilution Table

Dilute 29% Hydrogen Peroxide

1 part 29% H2O2 to 1 part water = 14.5% Hydrogen Peroxide

1 part 29% H2O2 to 2 parts water = 9.6% Hydrogen Peroxide

1 part 29% H2O2 to 3 parts water = 7.25% Hydrogen Peroxide

1 part 29% H2O2 to 4 parts water = 5.8% Hydrogen Peroxide

1 part 29% H2O2 to 8 parts water = 3.2% Hydrogen Peroxide

1 part 29% H2O2 to 9 parts water = 2.9% Hydrogen Peroxide

How to Make a Gallon of 3% Hydrogen Peroxide: Mix 1 cup, 9 tablespoons, and 2 teaspoons of 29% HP with 14 cups, 6 tablespoons, and 1 teaspoon of water.

Dilution Table

Dilute 27% Hydrogen Peroxide Down

1 part 27% H2O2 to 1.5 parts water = 10.8% Hydrogen Peroxide

1 part 27% H2O2 to 8 parts water = 3% Hydrogen Peroxide

Dilution Table

Dilute 12% Hydrogen Peroxide Down

1 part 12% H2O2 to 1 part water (12/2) = 6% Hydrogen Peroxide

1 part 12% H2O2 to 3 part water (12/4) = 3% Hydrogen Peroxide

1 part 12% H2O2 to 11 part water (12/12) = 1% Hydrogen Peroxide

Make 1 gallon of 3% Hydrogen Peroxide: Mix 4 cups of 12% HP with 12 cups of water.

Dilution Table

Dilute 10% Hydrogen Peroxide

1 part 10% H2O2 to 0.5 parts water (10/1.5) = 6.6% Hydrogen Peroxide

1 part 10% H2O2 to 2 part water (10/3) = 3.3% Hydrogen Peroxide

1 part 10% H2O2 to 2.5 parts water (10/3.5) = 2.85% Hydrogen Peroxide

How to make a gallon of 3% Hydrogen Peroxide: Mix 4.5 cups of 10% Hydrogen Peroxide with just under 11.5 cups of water.

Dilution Table

Dilute 6% Hydrogen Peroxide

1 part 6% H2O2 to 1 part water (6/2) = 3% Hydrogen Peroxide

1 part 6% H2O2 to 2 parts water (6/3) = 2% Hydrogen Peroxide

1 part 6% H2O2 to 3 parts water (6/4) = 1.5% Hydrogen Peroxide

1 part 6% H2O2 to 4 parts water (6/5) = 1.2% Hydrogen Peroxide

1 part 6% H2O2 to 5 parts water (6/6) = 1% Hydrogen Peroxide

Dilution Table

Dilute 3% Hydrogen Peroxide (10 Volume)

1 part 3% H2O2 to 1 part water (3/2) – 1.5% Hydrogen Peroxide

1 part 3% H2O2 to 2 parts water (3/3) = 1% Hydrogen Peroxide

1 part 3% H2O2 to 5 parts water (3/6) = 0.5% Hydrogen Peroxide

1 part 3% H2O2 to 14 parts water (3/15) = 0.2% Hydrogen Peroxide

1 part 3% H2O2 to 29 parts water (3/30) = 0.1% Hydrogen Peroxide

1 part 3% H2O2 to 69 parts water (3/70) = 0.04% Hydrogen Peroxide

Where to Buy Hydrogen Peroxide

You can find higher concentrations at hydroponic stores and sometimes at gardening stores and hardware stores.

You may be able to find hydrogen peroxide at 12% on Amazon.

If they are not sold out the next place I would look is online hydroponic stores.

You can also find some concentrations at beauty supply stores (usually 12%).

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Comments

  2. max johnson

    ai says add 1.1 teaspons 3% h202 to 16 ounces of saline to produce a 0.1% solution. random blog people insist it is 4 teaspoons.

    Reply

  3. Krista

    Hello 🙂

    Thanks for all the helpful info. I’m trying to determine the lowest percentage of hydrogen peroxide that will kill mold spores on surfaces in a home where mold remediation was done (the contractors will just use a vacuum when done) – on all surfaces, including walls, floors, wooden furniture, cabinets,etc. I saw a study that concluded that 7% would be adequate. Would you be willing to comment?

    Reply

    • Corinne Segura, Building Biologist

      You’d have to look at EPA guidelines, I don’t advise on mold remediation directly

      Reply

  4. Krista

    Hi Corrine,

    I’m actually looking to see if you have an article about what can be salvaged from a moldy house,that may answer questions like:
    Is wood furniture okay,once wiped down with hydrogen peroxide formula? Are contents in rooms that were farthest from ‘mold epicentre’ safe/r? If they are packed in boxes, put in non moldy storage for a few months, and then aired out well or put in enclosed space with a good air filter, would this eliminate mold and render them safe? Thanks in advance for any info or advice on the topic.

    Reply

    • Corinne Segura, Building Biologist

      hey I have to edit that word for the algorithms that be. people have used these ratios to get the mix recommended by a professional.

      Reply

  6. Em

    Corinne, this dilution table rocks! Thanks!
    (And it’s a little hilarious how many answers are in the table and the people asking questions just aren’t looking! Just a little. 🙂 Now that I think about it, I wonder if their trouble is “parts.” Like, I don’t need 12 cups of 1% solution, so I have to break down cups into tablespoons and go from there. 😀 I’m NOT saying break it down into measurements! I was just commenting.
    Thank you, again!

    Reply

    • Em

      Freakin’ math, right?
      Let’s see. 1.5 goes into 6 four times. so I believe 1 part h2o2, 3 parts h2o. That is, 1 part hydrogen peroxide, 3 parts water.

      Reply

  9. Lisa

    How would I dilute 34.5% hydrogen peroxide down to 27%? I need it for wood bleaching purposes but our local pool supplier only has 34.5%

    Reply

  10. Johann Schmuck

    can you please help me with tis question?. I have 4000 ml of h2o water how many ml of 34% h202 I have to add to make 3% h2o2. thanks

    Reply

  11. David

    hi i have a small business i was trying to work out how much 50% h202 to add to my 2000 litre tank to make 3% h202 for healthy lettuce plants .kind Regards dave wade

    Reply

    • Corinne

      depends if you’re adding it on top of the 2000 or 2000 is the capacity of the tank.

      You can calculate for 100% HP and then double it. 120 L of 50% HP added to 1880 L is 3% solution and 2000 L

      Reply

    • Corinne

      1 part 50% to .42857 part water is 50/1.42857 = 35%
      So for every gallon that you have you want to add 0.42857 of a gallon which is 1622.31 millilitres (which is 6.857 cups)
      6.857 cups x 15 = 102.85 cups

      Reply

  13. Elie

    What %hp is traditionally used in Laundry instead of laundry bleach? Looking to use hp in the washing machine bleach compartment.

    Reply

  14. Jennifer

    Hello. I have a gallon of 27% pool peroxide. Can you include a chart for this percentage and also mixing volumes.

    Reply

  16. Davr

    Just go some 50 percent hp for hydroponics would 2 ml of hp mixed with 20 litres of water be ok for plants

    Reply

  18. Anastasialuc

    Does diluting the HP reduce the shelf life and/or efficacy for cleaning purposes?
    Thanks so much

    Reply

  19. Sarah

    Thank you so much for this collaborative and supportive information! I just want to double check that I’ve got this right (math feels shaky). Is this right:

    I want to achieve a .04% dilution of HP…so I should take 1 part of 3% HP and add it to 69 parts distilled water?

    So I could take 1 teaspoon of 3% HP and then add 69 teaspoons of HP. The resulting solution would be .04 HP?

    Thank you so much and God bless the spirit of people helping people!

    Reply

  20. Peggy Karp

    Thanks very much for the dilution table. Very helpful!

    I want to make an even more dilute solution. So if I am starting with 1 teaspoon of 3% H202, how many teaspoons, of water do I need to get a .04% solution? Thanks!

    Reply

  21. Tracey Fraser

    Not understanding any of this ! The question as I understand it , is how do I get a .1% dilution from a 10 volume hydrogen peroxide solution? A simple answer please.

    Reply

  23. Jeff Hyett

    I apologize if this question can’t be addressed here. I bought a gallon of 35% food grade HP about 5 years ago and opened it last year. I used about a cup of it. The white plastic container has been closed with the cap since. How do I determine the concentration now?

    Reply

  27. Rakesh

    Do All Types of Cosmetic Peroxide up to 12 % (Developer) are restricted in Air & Sea Transportation.
    Can you quote any document where it is clarified that up to 9% o5 up to 12 % Peroxide (Developer) used on Hair with Coloring / Bleaching are exempted from DGR/Hazmat with standard packaging
    like Small packaging of 1000 ml (Retail Packaging)
    Hoping to hear from you very soon.
    Rakesh

    Reply

  28. Rakesh Kumar

    Hi, we are a non profit organisation working as an eye care service provider. we have to disinfect the spectacle frames used by our patients during the selection of frame. Can we use Hydrogen Peroxide to disinfect the spectacle frames, Also we have 6.5% hydrogen peroxide but we require 0.5%. How can we dilute it.
    Thanks

    Reply

  31. Mike

    Hi,

    Just want to ask so that I have got it correct:

    If I put 1dl of 10% Hydrogen Peroxide in a glas and then add 2dl distilled water I will get a concentration of 3.3% Hydrogen peroxide, correct? (1 part 10% to 2 part water (10/3) = 3.3% Hydrogen Peroxide).

    There is a bottle available where I live that is 9.5% concentration of Hydrogen peroxide so seem perfect. It is cheaper to buy the 9.5% bottle than the 3% bottle since it is basically 3 times more hydrogen peroxide in the 9.5% bottle (only $2.79 difference).

    Thanks

    Reply