Bleach Dilution Calculator

Q: What’s the difference between % and ppm?

1% equals 10,000 ppm. Choose the unit your protocol uses—the calculator converts internally.

Q: Will this work with 8.25% bleach?

Yes. Enter 8.25% as the stock concentration; the calculator ensures C1 ≥ C2 for valid dilutions.

Q: How does 1:x ratio relate to %?

Ratio mode splits the final volume by parts and does not target a specific %.

Make the right bleach solution for labs, classrooms, or cleaning. Enter your stock bleach %, choose a target (% or ppm) or a 1:x ratio, and set the final volume—we’ll compute how much bleach and water to mix, with steps and a mini visualization.

Background

For concentration-based dilutions we use C₁V₁ = C₂V₂, where C is concentration (in % or ppm) and V is volume. For ratio mode (1:x), the final volume is split by parts and the stock % is not used.

Safety: Wear gloves and eye protection, work in a ventilated area, and never mix bleach with ammonia, acids, or other cleaners.

Enter known values

Mode:

By target concentration (% or ppm)

By ratio (1:x, bleach:water)

Stock bleach concentration (%):

Household bleach typically ranges 5–8.25% sodium hypochlorite.

Target concentration:

1% = 10,000 ppm. We’ll convert under the hood as you switch units.

Dilution ratio (bleach : water)

Ratio mode ignores stock % and target concentration.

Final solution volume:

Show:

Step-by-step working

Mini chart: bleach vs water

Result:

No results yet. Enter inputs and click Calculate.

How to use this calculator

Concentration mode: Use C₁V₁ = C₂V₂. We solve for the bleach volume V₁ and subtract from final volume to get water.
Ratio mode: The final volume is split into parts 1:x (bleach:water).
Units: mL, L, fl oz, and gal are supported. We convert internally for accuracy.