How is Crude Birth Rate Calculated

Crude Birth Rate Calculator

The Crude Birth Rate (CBR) is a fundamental demographic indicator used to measure the number of live births in a population over a specific period, usually a year, relative to the total population size. It provides a snapshot of the fertility levels of a population and is a key component in understanding population growth and change.

function calculateCBR() { var liveBirths = document.getElementById("liveBirths").value; var midYearPopulation = document.getElementById("midYearPopulation").value; var resultDiv = document.getElementById("result"); resultDiv.innerHTML = ""; // Clear previous results // Input validation if (isNaN(liveBirths) || liveBirths === "" || isNaN(midYearPopulation) || midYearPopulation === "") { resultDiv.innerHTML = "Please enter valid numbers for both fields."; return; } if (parseFloat(liveBirths) < 0 || parseFloat(midYearPopulation) <= 0) { resultDiv.innerHTML = "Number of live births cannot be negative, and mid-year population must be a positive number."; return; } // Calculation var cbr = (parseFloat(liveBirths) / parseFloat(midYearPopulation)) * 1000; // Display result resultDiv.innerHTML = "

Crude Birth Rate (CBR)

" + "Number of Live Births: " + parseFloat(liveBirths).toLocaleString() + "" + "Mid-Year Population: " + parseFloat(midYearPopulation).toLocaleString() + "" + "The Crude Birth Rate is: " + cbr.toFixed(2) + " per 1,000 people"; } .calculator-container { font-family: sans-serif; border: 1px solid #ddd; padding: 20px; border-radius: 8px; max-width: 500px; margin: 20px auto; background-color: #f9f9f9; } .calculator-container h2 { text-align: center; margin-bottom: 20px; color: #333; } .input-section { margin-bottom: 20px; } .input-section label { display: block; margin-bottom: 8px; font-weight: bold; color: #555; } .input-section input[type="number"] { width: calc(100% – 22px); /* Adjust for padding and border */ padding: 10px; margin-bottom: 15px; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box; /* Include padding and border in the element's total width and height */ } .calculator-container button { display: block; width: 100%; padding: 12px 20px; background-color: #4CAF50; color: white; border: none; border-radius: 4px; cursor: pointer; font-size: 16px; transition: background-color 0.3s ease; } .calculator-container button:hover { background-color: #45a049; } #result { margin-top: 30px; padding: 15px; border-top: 1px solid #eee; background-color: #fff; border-radius: 4px; } #result h3 { margin-top: 0; color: #4CAF50; } #result p { margin-bottom: 10px; line-height: 1.5; color: #333; } #result strong { color: #4CAF50; } .error { color: #f44336; font-weight: bold; }

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