Pure Tone Average Calculator

Formula

The formula to calculate the Pure Tone Average (PTA) is:

\[ \text{PTA} = \frac{\sum \text{TL}}{4} \]

Where:

\( \text{PTA} \) is the Pure Tone Average (dB)
\( \sum \text{TL} \) is the sum of the threshold levels at 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz

Pure Tone Average Definition

A pure tone average is a measure of the average hearing sensitivity a person has at various frequencies. These frequencies are typically measured at 3, 4, or 6 different frequency levels.

Example Calculation

Let's consider an example:

Threshold Level at 500 Hz: 20 dB
Threshold Level at 1000 Hz: 25 dB
Threshold Level at 2000 Hz: 30 dB
Threshold Level at 4000 Hz: 35 dB

Using the formula to calculate the Pure Tone Average:

\[ \text{PTA} = \frac{20 + 25 + 30 + 35}{4} = 27.5 \, \text{dB} \]

This demonstrates that with the given threshold levels, the pure tone average would be 27.5 dB.