Total Fertility Rate (TFR) Calculator
The Total Fertility Rate (TFR) is a hypothetical measure representing the average number of children a woman would have if she experienced the current age-specific fertility rates throughout her reproductive years (typically considered ages 15-49). It is a key demographic indicator used to understand population growth and reproductive patterns.
Total Fertility Rate (TFR) Result:
.calculator-container {
font-family: sans-serif;
max-width: 700px;
margin: 20px auto;
padding: 20px;
border: 1px solid #ddd;
border-radius: 8px;
background-color: #f9f9f9;
}
.calculator-container h2 {
text-align: center;
color: #333;
margin-bottom: 20px;
}
.calculator-inputs, .calculator-result {
margin-bottom: 25px;
padding: 15px;
background-color: #fff;
border: 1px solid #eee;
border-radius: 5px;
}
.calculator-inputs h3, .calculator-result h3 {
margin-top: 0;
color: #555;
border-bottom: 1px solid #eee;
padding-bottom: 10px;
margin-bottom: 15px;
}
.input-group {
margin-bottom: 15px;
display: flex;
align-items: center;
flex-wrap: wrap;
}
.input-group label {
display: inline-block;
width: 180px;
margin-right: 10px;
font-weight: bold;
color: #444;
}
.input-group input[type="number"] {
padding: 8px;
border: 1px solid #ccc;
border-radius: 4px;
width: 120px;
box-sizing: border-box;
}
.input-group span {
font-size: 0.9em;
color: #777;
margin-left: 5px;
}
button {
display: block;
width: 100%;
padding: 12px;
background-color: #007bff;
color: white;
border: none;
border-radius: 5px;
font-size: 16px;
cursor: pointer;
transition: background-color 0.3s ease;
}
button:hover {
background-color: #0056b3;
}
#result {
font-size: 1.2em;
font-weight: bold;
color: #007bff;
text-align: center;
padding: 10px;
}
function calculateTFR() {
var asfr_15_19 = parseFloat(document.getElementById("asfr_15_19").value);
var asfr_20_24 = parseFloat(document.getElementById("asfr_20_24").value);
var asfr_25_29 = parseFloat(document.getElementById("asfr_25_29").value);
var asfr_30_34 = parseFloat(document.getElementById("asfr_30_34").value);
var asfr_35_39 = parseFloat(document.getElementById("asfr_35_39").value);
var asfr_40_44 = parseFloat(document.getElementById("asfr_40_44").value);
var asfr_45_49 = parseFloat(document.getElementById("asfr_45_49").value);
var age_intervals = [5, 5, 5, 5, 5, 5, 5]; // Each age group is 5 years
var total_fertility = 0;
if (!isNaN(asfr_15_19) && asfr_15_19 >= 0) {
total_fertility += asfr_15_19 * age_intervals[0];
}
if (!isNaN(asfr_20_24) && asfr_20_24 >= 0) {
total_fertility += asfr_20_24 * age_intervals[1];
}
if (!isNaN(asfr_25_29) && asfr_25_29 >= 0) {
total_fertility += asfr_25_29 * age_intervals[2];
}
if (!isNaN(asfr_30_34) && asfr_30_34 >= 0) {
total_fertility += asfr_30_34 * age_intervals[3];
}
if (!isNaN(asfr_35_39) && asfr_35_39 >= 0) {
total_fertility += asfr_35_39 * age_intervals[4];
}
if (!isNaN(asfr_40_44) && asfr_40_44 >= 0) {
total_fertility += asfr_40_44 * age_intervals[5];
}
if (!isNaN(asfr_45_49) && asfr_45_49 >= 0) {
total_fertility += asfr_45_49 * age_intervals[6];
}
// TFR is calculated by summing the ASFRs multiplied by the width of each age interval (5 years), and then divided by 1000 because ASFR is per 1000 women.
var result = total_fertility / 1000;
if (isNaN(result) || result < 0) {
document.getElementById("result").innerHTML = "Please enter valid non-negative numbers for all ASFRs.";
} else {
document.getElementById("result").innerHTML = result.toFixed(2) + " children per woman";
}
}