Coronavirus Mask Calculator

Masks act as a physical barrier that reduces the spread of respiratory droplets — the primary route of COVID-19 transmission. Many infected individuals experience mild or no symptoms, meaning they can unknowingly spread the virus simply by talking or breathing. Studies have shown that widespread mask use significantly reduces community transmission rates.

The calculator estimates your total mask needs based on mask type, how many hours per day each person wears a mask, the number of people, and the duration in days. It accounts for recommended change intervals (e.g. every 8 hours for surgical masks), reuse options for cloth masks, and applies average market prices to give you a cost estimate.

As a general guideline, surgical and N95/N99 masks should be replaced every 8 hours of use or sooner if they become damp, soiled, or damaged. Cloth masks should be washed after each day of use. Using a mask beyond its recommended duration reduces its filtration effectiveness and may increase infection risk.

Ensure the mask covers both your nose and mouth snugly without gaps. Wash your hands before putting on and after removing a mask. Avoid touching the front of the mask while wearing it. Store used masks in a clean, breathable bag if you need to temporarily remove them, and never share masks with others.

Cloth masks offer basic protection and are reusable after washing, with filtration efficiency around 50–70%. Surgical masks are disposable and filter about 80% of particles. N95 respirators filter at least 95% of airborne particles and provide the highest protection among common options. N99 respirators filter 99% or more but are typically more expensive and harder to source.

It depends on your mask type and daily usage. If you wear a surgical mask 8 hours a day, you'll need roughly 1 mask per day. For a household of 4 over 30 days, that's about 120 surgical masks. Cloth masks reduce this count significantly since they can be washed and reused. Use the calculator above for a precise estimate based on your situation.

Early in the pandemic there was debate about mask effectiveness, largely due to conflicting guidance and supply concerns. However, a large body of peer-reviewed research has since confirmed that masks — especially N95/N99 respirators and surgical masks — substantially reduce COVID-19 transmission. Health authorities including the CDC and WHO recommend mask use in high-risk settings.

Yes. Using a cloth mask with a filter insert combines the reusability of cloth with significantly improved filtration. N95-grade filter inserts bring the combined mask's filtration close to 95%, while N99 inserts push it even higher. Filters should be replaced after about 8 hours of cumulative use, while the cloth outer layer can be washed and reused.