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Coronavirus Mask Calculator

Face Mask Calculator

How many masks you'll need and what they'll cost

Saved Calculations
No history yet. Calculate below to start tracking.

Different mask types have different safe wear times before they need replacing (or washing, for cloth masks). Multiply your daily wear time by the number of days, then divide by the mask's replacement interval to estimate how many you'll get through.

Cloth masks are the exception — they're washable and reusable, so a small rotating set (5 is typical) usually covers you indefinitely with regular laundering.

Mask Type
Hours Worn per Day
hrs
Number of Days
Price per Mask
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😇 Your Result
Masks Needed
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Fill in the fields above to calculate
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Total Wear Hours
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Total Cost
Calculation
Estimate only — follow your local health authority's current mask guidance, which may override these general replacement intervals.

Different mask types have very different safe wear times before they need replacing, this calculator estimates how many masks you’ll actually get through and what they’ll cost, based on your specific mask type and wear habits.

How to use this face mask calculator

  1. Select your Mask Type: cloth (washable), surgical, N95/N99 respirator, or a mask with replaceable filter.
  2. Enter Hours Worn per Day and Number of Days.
  3. Enter your Price per Mask and currency.
  4. Read your Masks Needed, Total Wear Hours, and Total Cost.

What this calculator does

Each mask type has a different safe replacement interval, surgical masks are typically replaced every 2 hours of wear, while N95/N99 respirators can safely last around 16 hours of cumulative wear before replacement. This calculator multiplies your daily wear time by the number of days, then divides by the mask’s specific replacement interval to estimate how many you’ll get through over your specified period.

Masks Needed = (Hours Worn per Day × Number of Days) ÷ Replacement Interval (hours)
Total Cost = Masks Needed × Price per Mask

Why cloth masks are the exception

Cloth masks are washable and reusable rather than disposable, so instead of a replacement-interval calculation, a small rotating set, 5 masks is a typical recommendation, usually covers a household indefinitely with regular laundering between uses.

Why replacement intervals differ so much by mask type

Surgical masks lose their filtration effectiveness relatively quickly with moisture buildup from breathing, hence the shorter 2-hour interval. N95/N99 respirators are designed with more robust filtration media and can safely handle roughly 16 hours of cumulative wear. Masks with replaceable filters extend the useful life of the outer mask shell considerably since only the filter itself needs periodic replacement, often on a weekly basis.

Frequently asked questions

Why do surgical masks need replacing so much more often than N95s?

Surgical masks lose filtration effectiveness relatively quickly as moisture builds up from breathing, hence the shorter roughly 2-hour replacement interval, compared to an N95/N99 respirator’s more robust filtration media, good for around 16 hours of cumulative wear.

Do cloth masks need to be replaced like disposable ones?

No, cloth masks are washable and reusable, a small rotating set (5 is typical) with regular laundering usually covers a household indefinitely, rather than following a replacement-interval calculation like disposable masks.

Should I follow this calculator’s intervals over official health guidance?

No, always follow your local health authority’s current mask guidance, which may override these general replacement interval estimates based on updated research or local conditions.