.cdr-calculator-container {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
padding: 20px;
background: #f9f9f9;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}
.cdr-calc-box {
background: #ffffff;
padding: 25px;
border-radius: 8px;
border: 1px solid #e0e0e0;
margin-bottom: 30px;
}
.cdr-input-group {
margin-bottom: 20px;
}
.cdr-input-group label {
display: block;
margin-bottom: 8px;
font-weight: 600;
color: #333;
}
.cdr-input-group input {
width: 100%;
padding: 12px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box;
}
.cdr-input-group input:focus {
border-color: #007bff;
outline: none;
box-shadow: 0 0 0 2px rgba(0,123,255,0.25);
}
.cdr-btn {
background-color: #007bff;
color: white;
border: none;
padding: 14px 24px;
font-size: 16px;
font-weight: 600;
border-radius: 4px;
cursor: pointer;
width: 100%;
transition: background-color 0.2s;
}
.cdr-btn:hover {
background-color: #0056b3;
}
#cdr-result-box {
margin-top: 25px;
padding: 20px;
background-color: #e8f4fd;
border-left: 5px solid #007bff;
border-radius: 4px;
display: none;
}
.cdr-result-title {
font-size: 14px;
color: #555;
text-transform: uppercase;
letter-spacing: 1px;
margin: 0 0 5px 0;
}
.cdr-result-value {
font-size: 32px;
font-weight: 700;
color: #007bff;
}
.cdr-result-desc {
font-size: 14px;
color: #666;
margin-top: 5px;
}
.cdr-content {
line-height: 1.6;
color: #333;
}
.cdr-content h2 {
margin-top: 30px;
color: #2c3e50;
border-bottom: 2px solid #eee;
padding-bottom: 10px;
}
.cdr-content ul {
padding-left: 20px;
}
.cdr-content li {
margin-bottom: 10px;
}
.formula-box {
background: #eee;
padding: 15px;
border-radius: 5px;
font-family: monospace;
text-align: center;
font-size: 18px;
margin: 20px 0;
}
function calculateCDR() {
var deathsInput = document.getElementById("total-deaths");
var populationInput = document.getElementById("total-population");
var resultBox = document.getElementById("cdr-result-box");
var resultValue = document.getElementById("cdr-result-value");
var deaths = parseFloat(deathsInput.value);
var population = parseFloat(populationInput.value);
if (isNaN(deaths) || isNaN(population)) {
alert("Please enter valid numbers for both deaths and population.");
return;
}
if (population <= 0) {
alert("Population must be greater than zero.");
return;
}
if (deaths < 0) {
alert("Number of deaths cannot be negative.");
return;
}
// Calculation Logic: (Deaths / Population) * 1,000
var crudeDeathRate = (deaths / population) * 1000;
// Display logic
resultValue.innerHTML = crudeDeathRate.toFixed(2);
resultBox.style.display = "block";
}
Formula to Calculate Crude Death Rate
The Crude Death Rate (CDR) is a fundamental demographic statistic used to measure the mortality of a population. It represents the number of deaths occurring within a specific geographic area (such as a country, state, or city) over a given period, typically one year, per 1,000 individuals in the mid-year population.
The Formula
The standard mathematical formula to calculate the Crude Death Rate is:
CDR = ( D / P ) × 1,000
Where:
- CDR = Crude Death Rate
- D = Total number of deaths recorded in the year
- P = Mid-year total population
- 1,000 = The multiplier to express the rate "per thousand"
Example Calculation
To understand how to apply the formula, consider a small town with the following statistics:
- Total Deaths (D): 450 deaths occurred during the year.
- Total Population (P): The mid-year population estimate is 60,000 people.
Using the formula:
CDR = (450 / 60,000) × 1,000
CDR = 0.0075 × 1,000
CDR = 7.5
This means there were 7.5 deaths per 1,000 people in that town for that year.
Why is the Crude Death Rate Important?
Demographers, sociologists, and public health officials use the Crude Death Rate for several critical functions:
- Population Growth Analysis: By comparing the Crude Death Rate with the Crude Birth Rate, analysts can calculate the rate of natural increase or decrease in a population.
- Health Assessment: While "crude" because it doesn't account for age distribution (unlike age-specific mortality rates), it provides a quick snapshot of the mortality burden in a region.
- Historical Comparisons: It allows for the tracking of mortality trends over decades to see the impact of medical advancements, wars, or pandemics.
Limitations
It is important to note that the CDR is considered "crude" because it is influenced heavily by the age structure of the population. A country with a very large elderly population may have a higher CDR than a developing nation with a very young population, even if the developing nation has lower standards of healthcare. For more detailed comparisons, standardized mortality rates are often used.