Calculate hand washing effectiveness from duration and technique — see germ reduction and recommended time.
Calculate hand washing effectiveness from duration and technique — see germ reduction and recommended time.
Enter values above and click Calculate — results will appear here with the formula explained.
Proper 20s scrub with soap removes ~90% of germs. Quick rinse removes ~20%, 10s ~50%. 20 seconds is CDC recommendation.
This is estimate; germ type and soap matter. For YMYL infection control, wash 20s before eating and after restroom.
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Proper 20s scrub with soap removes ~90% of germs. Quick rinse removes ~20%, 10s ~50%. 20 seconds is CDC recommendation. Formula: Reduction: proper 20s ~90%, 10s ~50%, quick rinse ~20%; Recommended 20s
Hand Washing Calculator: Calculate hand washing effectiveness from duration and technique — see germ reduction and recommended time. Formula: Reduction: proper 20s ~90%, 10s ~50%, quick rinse ~20%. Example: With 20s proper: ~90% reduction, recommended.
Calculate hand washing effectiveness from duration and technique — see germ reduction and recommended time. Formula: Reduction: proper 20s ~90%, 10s ~50%, quick rinse ~20%; Recommended 20s
| Field | What to enter |
|---|---|
| Washing seconds | e.g. 20 |
| Technique | Enter a value |
All fields use the exact formulas shown below — results include step-by-step breakdowns you can verify by hand.
Proper 20s scrub with soap removes ~90% of germs. Quick rinse removes ~20%, 10s ~50%. 20 seconds is CDC recommendation.
This is estimate; germ type and soap matter. For YMYL infection control, wash 20s before eating and after restroom.
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With 20s proper: ~90% reduction, recommended. With 5s quick: ~20%, not enough.
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