Concentration time weighted average online calculation

App description

The time-weighted average is a limited concentration
specified in the threshold table established by the
American Association of Governmental Industrial Hygienists
(ACGIH). Refers to the average concentration of
the normal 8-hour working day or a 40-hour working week
based on the time of exposure to harmful substances.
It is the allowable limit, but there must be a corresponding
compensation time below the limit during the
working day. This limit does not apply to substances that
are acutely active.

Calculated by this formula: \(time-weighted average
concentration = (C1T1 + C2T2 + ... + CiTi) ÷ 8 (h) \)

Where: C is the contact concentration (ppm); T is the
continuous contact time (h).

Usage example

Concentration 1: 20

Time 1: 1 hour

Concentration 2: 45

Time 2: 1.5 hours

Concentration 3: 50

Time 3: 1.5 hours

Concentration 4: 60

Time 4: 2 hours

Concentration 5: 45

Time 5: 2 hours

Input total time: 8 hours

Click "Calculate" to output the result.

Time weighted average: 46.525