Mortality rate or death rate is a measure of the frequency of occurrence of death in a defined population during a specified interval.

**Formula to calculate mortality rate.**

To calculate a death rate the number of deaths recorded is divided by the number of people in the population, and then multiplied by 100, 1,000 or another convenient figure.

**Example:**

Suppose in a town 300 death were recorded, the towns population before the deaths was 700. Calculate the towns mortality rate.

Thus, the mortality rate is 42.9%.