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CDC institutional bleach dilution ratios (with calculator)

0.1% (1000 ppm) target equals ~1:49 bleach to water. Includes household conversions (5 tbsp per gallon, 4 tsp per quart) and contact-time reminders.

1000 ppm (0.1%) disinfectionHousehold guidance (5 tbsp/gal)Custom (open calculator)
Active ratio49:1 (water:product)
Bottle1 liter canister
Open in calculatorJump to presets

Exact amounts (pre-calculated)

  • Part A20 mL by volume20.0 g
  • Part B980 mL by volume980.0 g

Add 20 mL Part A, 980 mL Part B; fill to 1 L.

Use-case presets

1000 ppm (0.1%) disinfection

49:1 (water:product)

CDC-referenced mix for hard, non-porous surface disinfection.

  • Use within 24 hours for best efficacy.
  • Keep surfaces visibly wet for the labelled contact time.
500 mL spray bottle
Product: 10 mL (0.3381 oz)
Water: 490 mL (16.57 oz)
1 liter canister
Product: 20 mL (0.6763 oz)
Water: 980 mL (33.14 oz)
32 oz bottle
Product: 18.93 mL (0.64 oz)
Water: 927.4 mL (31.36 oz)
Household guidance (5 tbsp/gal)

32:1 (water:product)

Household EPA guidance equivalent (5 tablespoons per gallon of water).

  • Use in well-ventilated areas and wear gloves.
500 mL spray bottle
Product: 15.15 mL (0.5123 oz)
Water: 484.8 mL (16.39 oz)
1 liter canister
Product: 30.3 mL (1.025 oz)
Water: 969.7 mL (32.79 oz)
32 oz bottle
Product: 28.68 mL (0.9697 oz)
Water: 917.7 mL (31.03 oz)

Safety and compliance

Do not use on
  • Mixing with acids or ammonia
  • Use on porous fabrics without testing
PPE
  • Gloves
  • Eye protection
  • Apron for splash-prone tasks
Notes
  • Ventilate the area and mix fresh daily.
  • Label containers clearly to avoid accidental ingestion.
  • Follow manufacturer label; many 1000 ppm solutions require ≥1 minute wet contact.
MixByParts is not affiliated with CDC. Ratios shown are from the manufacturer and authoritative guidelines; always verify on your bottle or TDS for your exact SKU.Never mix with acids or ammonia. Make fresh daily. Ventilate. (CDC)

Sources & verification

FAQ

Can I store mixed bleach overnight?

It’s best to mix fresh daily. Bleach solutions degrade quickly, especially when exposed to light or organic soil.

What contact time does 1000 ppm need?

Follow the product label; many EPA-registered disinfectants require at least one minute of visible wet contact at 1000 ppm.

Is 1:49 safe on stainless steel?

Rinse after the required contact time to avoid corrosion, and dry the surface completely.

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Internal links

CDC institutional bleach dilution ratios (with calculator) – MixByParts