The formula for calculating the crude mortality rate is: \[ \text{Crude Mortality Rate} = \left( \frac{\text{Number of Deaths in a Given Year}}{\text{Total Population at Mid-Year}} \right) \times 1,000 \]
For example, if a population of 100,000 people experiences 1,000 deaths in a year, the crude mortality rate would be: \[ \left( \frac{1,000}{100,000} \right) \times 1,000 = 10 \text{ deaths per 1,000 people} \]