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Bleach Dilution Calculator

Enter your target ppm, solution volume, and bleach strength to find how much bleach you need.

How it is calculated

A bleach labelled 1 % holds 10,000 ppm of sodium hypochlorite, so the bleach strength in ppm is pct × 10,000. The tool computes bleach (mL) = target ppm × volume (L) ÷ (pct × 10), where the target is in ppm, the final solution volume is in litres and pct is the percentage on the label. Water is then volume − bleach ÷ 1000 litres, and the ratio is shown as 1 : total volume ÷ bleach volume.

The volume you enter is the final total, not the water volume. The tool treats the label percentage as the strength of the product and does not correct for solution density. It shows no result for zero or negative inputs, or when the target ppm is higher than the bleach itself (above pct × 10,000). Label strengths drop as bleach ages, so the real dose may be slightly higher.

Worked example

You want 4 litres of a 200 ppm solution from a 6 % bleach. Bleach = 200 × 4 ÷ (6 × 10) = 800 ÷ 60 = 13.3 mL (13.33 before rounding). That is 0.013 L, so the water is 4 − 0.013 = 3.99 L. The ratio is 4,000 ÷ 13.33 = 300, shown as 1 : 300, meaning one part of bleach in every 300 parts of finished solution.

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Common mistakes

  • Typing the water volume instead of the final solution volume. The tool subtracts the bleach from the volume you give, so the totals will not match what you poured.
  • Entering the strength as a fraction, such as 0.06 for 6 %. The field expects the percentage, so 0.06 would make the bleach look 100 times weaker and the dose 100 times too big.
  • Reading 1 : 300 as one part bleach to 300 parts water. It is one part bleach in 300 parts of the finished solution, so the water is 299 parts.
  • Using a fresh-label strength for old or diluted bleach. A bleach that has lost strength delivers fewer ppm than the figure calculated.
  • Confusing mL and L. The bleach result is in millilitres, the water in litres.

About this calculator

Bleach dilution is a dimensional-analysis problem built on the dilution relationship C1V1 = C2V2: the target chlorine concentration in parts per million, multiplied by the total solution volume, tells you how much active chlorine mass is needed, and dividing that by the bleach product’s percent available chlorine (treating 1 % as 10,000 ppm, as is usual for dilute solutions) gives the volume of bleach to add. Household bleach is typically sold around 6–8.25% sodium hypochlorite, so the same target ppm requires very different volumes depending on which strength you use.

Restaurants and food-service operations follow published sanitizing ranges (commonly around 50–200 ppm for food-contact surfaces per health-department and CDC guidance), water treatment operators dose to disinfection targets, and households use it for diluted cleaning or disinfecting solutions.

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Comments (1)

  • Editorial team

    After mixing, a test strip for chlorine is the practical check that you hit the target, because the label strength drops as bleach ages. Sanitizer ranges also differ between health authorities, so use the number your local guideline gives. The calculator only finds the dose for that target. What are you diluting for, food-contact surfaces, laundry or something else, and what target did your guideline set?

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