To dilute 3% hydrogen peroxide to 1% , mix 1 part 3% hydrogen peroxide with 2 parts water. That gives you a 3x dilution, which lowers 3% to 1%.

Example

  • 1 cup 3% hydrogen peroxide + 2 cups water = 3 cups of 1% solution.

Quick formula

  • Final concentration = starting concentration × peroxide parttotal parts\frac{\text{peroxide part}}{\text{total parts}}total partsperoxide part​
  • For 3% to 1%: 13\frac{1}{3}31​ of the final mix should be peroxide.

Safety note

  • Use a clean, non-metal container and label the mixture clearly.
  • If you need it for skin, cleaning, or plants, the right dilution can vary, so the intended use matters.

SUMMARY: 3% to 1% means 1 part peroxide + 2 parts water.