Mask vs No Mask Risk Calculator
The Mask vs No Mask Risk Calculator shows how much a mask reduces your estimated infection risk in a given situation. Enter the baseline risk without a mask and the mask's effectiveness.
Formula
Risk with mask = Baseline Risk × (1 − Effectiveness)
- Effectiveness combines filtration and fit; a well-fitted respirator performs best.
- This is a simplified estimate for comparison, not a medical prediction.
10% baseline, 70% effective
Inputs
- Baseline Risk (no mask): 10 %
- Mask Effectiveness: 70 %
10% × (1 − 0.70) = 3% risk with a mask, a 7-point reduction.
Frequently asked questions
How much do masks reduce risk?
It depends on fit and type. A mask that is 70% effective cuts a 10% baseline risk to about 3%.