Bleach dilution calculators
Estimate dilution from a stated available-chlorine concentration. Follow your exact product instructions.
Use the manufacturer-stated available chlorine in mg/L. Sodium hypochlorite percentage is not interchangeable with this value. If it is not available, follow the label’s dilution instructions or ask the manufacturer.
Concentration shortcuts do not establish suitability for food-contact surfaces, toys, outbreaks or other applications. The exact product label determines use, target concentration, contact time and rinsing.
Use the manufacturer’s available chlorine strength, not the sodium hypochlorite %.
mg/L · no thousands separators
Only sodium hypochlorite % on your bottle? Get the stated available chlorine in g/L or mg/L from the product documentation or manufacturer. If unavailable, follow the manufacturer’s dilution instructions.
| Label (g/L) | Enter (mg/L) |
|---|---|
| 50 | 50000 |
| 82.5 | 82500 |
| 125 | 125000 |
Match your label; these are not % conversions.
Results update as you type. See dilution estimate ↓
Target shortcuts are arithmetic inputs. Use the target from your product’s instructions.
Enter the available chlorine strength from your label to see your dilution estimate.
Popular use cases
- Calculate a label-selected concentration
- Scale a final batch in metric or US volume units
Guides & resources
Featured calculators
FAQs
Which concentration should I choose?
Use the target in the exact product instructions for your intended application. A calculation cannot establish effectiveness or compliance.
What happened to the percentage presets?
The old percentage and assumed-density recipes were retired. The updated tool requires available chlorine in mg/L and does not guess a household product’s strength.
Can I store diluted bleach?
Follow the product’s storage instructions and prepare fresh solutions as directed. Storage and product age can reduce available chlorine.
References & Safety
- CDC: Cleaning and disinfecting with bleach (surface contact time guidance)
- Public Health Ontario: dilution equation C1 × V1 = C2 × V2 and handling precautions
- WHO: Cleaning & disinfecting surfaces in non-health care settings (0.1% / 1,000 ppm)
- WHO: Cleaning and disinfection of environmental surfaces (PDF)
Follow the exact product label for concentration, contact time, rinsing, ventilation, protection and storage. Never mix bleach with other cleaners. A concentration calculation alone cannot establish effectiveness or legal compliance.
Last reviewed: 2026-09-10