How to Calculate Time-Weighted Averages

••• Chalirmpoj Pimpisarn/iStock/GettyImages

Time-weighted averages take into consideration not only the numerical levels of a particular variable, but also the amount of time spent on it. For instance, if workers are exposed to different doses of noise for different amounts of time, we might use time-weighted averages -- acknowledging the differences in the amounts of time spent exposed to different amounts of noise -- to determine a worker's average amount of sound exposure.

    Multiply each value by its time weighting. For instance, if a worker is exposed to 86 dB of noise for 13 hours a week, 26 dB of noise for 23 hours a week, and 0 dB of noise for 4 hours a week, you would obtain 86 x 13, 26 x 23 and 0 x 4 (1118, 598, and 0 dB hours, respectively).

    Sum the values that you obtained in Step 1. In this case, you will obtain 1716 dB hours.

    Add together the time weights to get the total weight. In this case, the total weight is 13 + 23 + 4 = 40 hours.

    Divide the value in Step 2 by the total weights in Step 3, to obtain 1716 / 40 = 42.9 dB.

Related Articles

How to Calculate Average Usage
How to Convert Horsepower to kWh
How to Calculate Time in Decimals
How to Convert a Percentage Into Hours
How to Read a Time Clock in Hundredths of an Hour
How to Calculate kWh for Lighting
How to Calculate Yearly Averages
How to Work Out Percentages
How to Calculate the Distance, Rate and Time
How to Convert Seconds Into Miles Per Hour
How to Convert Kilometers to Hours
How to Convert Kilojoules to Kilocalories
How do I Calculate Cumulative Percentages?
How to Calculate MBH
How to Convert Hertz to Milliseconds
How to Convert Horsepower to Thrust
How to Calculate CV Values
How to Convert KWH to KVA
How to Approximate the Mean of Group Data
Difference Between 316 & 308 Stainless Steel