.calculator-container {
font-family: Arial, sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 600px;
margin: 20px auto;
background-color: #f9f9f9;
}
.calculator-container h2 {
text-align: center;
margin-bottom: 20px;
color: #333;
}
.form-group {
margin-bottom: 15px;
display: flex;
align-items: center;
}
.form-group label {
flex: 1;
margin-right: 10px;
font-weight: bold;
color: #555;
}
.form-group input[type="number"],
.form-group input[type="text"] {
flex: 2;
padding: 8px;
border: 1px solid #ddd;
border-radius: 4px;
box-sizing: border-box; /* Include padding and border in the element's total width and height */
}
.form-group input[type="number"]::placeholder,
.form-group input[type="text"]::placeholder {
color: #aaa;
}
.form-group button {
flex: 1;
padding: 10px 15px;
background-color: #4CAF50;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 14px;
margin-left: 10px;
}
.form-group button:hover {
background-color: #45a049;
}
#result {
margin-top: 20px;
padding: 15px;
border: 1px solid #ddd;
border-radius: 4px;
background-color: #e9e9e9;
text-align: center;
font-size: 16px;
font-weight: bold;
color: #333;
}
#result span {
color: #4CAF50;
}
.calculator-content {
line-height: 1.6;
color: #444;
}
.calculator-content h3 {
margin-top: 25px;
margin-bottom: 10px;
color: #333;
}
.calculator-content p,
.calculator-content ul {
margin-bottom: 15px;
}
.calculator-content ul {
padding-left: 20px;
}
.calculator-content strong {
color: #333;
}
function calculateCompoundInterest() {
var principal = parseFloat(document.getElementById("principal").value);
var annualRate = parseFloat(document.getElementById("annualRate").value);
var years = parseFloat(document.getElementById("years").value);
var compoundingFrequency = parseInt(document.getElementById("compoundingFrequency").value);
var resultDiv = document.getElementById("result");
if (isNaN(principal) || isNaN(annualRate) || isNaN(years) || isNaN(compoundingFrequency) ||
principal <= 0 || annualRate < 0 || years <= 0 || compoundingFrequency <= 0) {
resultDiv.innerHTML = "Please enter valid positive numbers for all fields.";
return;
}
// Convert annual rate to decimal
var rateDecimal = annualRate / 100;
// Calculate the total amount using the compound interest formula:
// A = P (1 + r/n)^(nt)
// Where:
// A = the future value of the investment/loan, including interest
// P = the principal investment amount (the initial deposit or loan amount)
// r = the annual interest rate (as a decimal)
// n = the number of times that interest is compounded per year
// t = the number of years the money is invested or borrowed for
var totalAmount = principal * Math.pow((1 + rateDecimal / compoundingFrequency), (compoundingFrequency * years));
// Calculate the total interest earned
var totalInterest = totalAmount – principal;
resultDiv.innerHTML = "Total Amount: $" + totalAmount.toFixed(2) + "" +
"Total Interest Earned: $" + totalInterest.toFixed(2) + "";
}
Compound Interest Calculator
Compound interest is the interest calculated on the initial principal, which also includes all the accumulated interest of previous periods. It's often referred to as "interest on interest." This powerful concept allows your investments to grow exponentially over time, thanks to the magic of compounding.
Understanding how compound interest works is crucial for effective financial planning, whether you're saving for retirement, a down payment, or any other long-term goal. The longer your money compounds, and the more frequently it compounds, the greater the potential for growth.
How to Use the Calculator:
- Principal Amount: Enter the initial sum of money you are investing or depositing.
- Annual Interest Rate: Input the yearly interest rate as a percentage (e.g., 5 for 5%).
- Number of Years: Specify how long you plan to let your investment grow.
- Compounding Frequency: Choose how often the interest is calculated and added to the principal (e.g., Annually, Semi-annually, Quarterly, Monthly, Daily).
The calculator will then show you the total amount you'll have after the specified period, including the impressive growth driven by compound interest.
Annually
Semi-annually
Quarterly
Monthly
Daily