Financial Calculators

Explore interactive financial calculators built with JavaScript - calculate future value, loan payments, and compound interest with contributions

Future Value Calculator

The concept of future value is related to time value of money. For example, if you deposit your money in a bank as a savings account or a fixed deposit account for a certain period of time, you will earn a certain amount of money based on the compound interest computed periodically.

Future Value Formula:

FV = PV × (1 + r)n

Where PV is the present value, r is the interest rate per period, and n is the number of periods.

// Future Value Calculator
function calculateFutureValue() {
    // Get input values
    const presentValue = parseFloat(document.getElementById('presentValue').value);
    const interestRate = parseFloat(document.getElementById('interestRate').value) / 100;
    const periods = parseInt(document.getElementById('periods').value);
    
    // Calculate future value
    const futureValue = presentValue * Math.pow(1 + interestRate, periods);
    
    // Display result
    document.getElementById('futureValueResult').textContent = 
        `$${futureValue.toFixed(2)}`;
}

Future Value Calculator

Calculate how much your investment will grow over time with compound interest.

Future Value: $1628.89

Loan Payment Calculator

This calculator helps you determine your monthly loan payments based on the loan amount, interest rate, and loan term. It's useful for mortgages, car loans, and personal loans.

Loan Payment Formula:

P = (r × PV) / (1 - (1 + r)-n)

Where P is the monthly payment, PV is the loan amount, r is the monthly interest rate, and n is the number of payments.

// Loan Payment Calculator
function calculateLoanPayment() {
    // Get input values
    const loanAmount = parseFloat(document.getElementById('loanAmount').value);
    const annualRate = parseFloat(document.getElementById('loanRate').value) / 100;
    const loanTerm = parseInt(document.getElementById('loanTerm').value);
    
    // Calculate monthly values
    const monthlyRate = annualRate / 12;
    const payments = loanTerm * 12;
    
    // Calculate monthly payment
    const monthlyPayment = (monthlyRate * loanAmount) / 
                           (1 - Math.pow(1 + monthlyRate, -payments));
    
    // Calculate total payment and interest
    const totalPayment = monthlyPayment * payments;
    const totalInterest = totalPayment - loanAmount;
    
    // Display results
    document.getElementById('monthlyPayment').textContent = 
        `$${monthlyPayment.toFixed(2)}`;
    document.getElementById('totalInterest').textContent = 
        `$${totalInterest.toFixed(2)}`;
    document.getElementById('totalPayment').textContent = 
        `$${totalPayment.toFixed(2)}`;
}

Loan Payment Calculator

Calculate your monthly loan payments and see how much interest you'll pay over the life of the loan.

Monthly Payment: $1,013.37

Total Interest: $164,813.42

Total Payment: $364,813.42

Compound Interest with Contributions

This calculator shows how regular contributions to an investment can grow with compound interest. It's perfect for retirement planning or long-term savings goals.

Compound Interest Formula with Contributions:

FV = P × (1 + r)n + C × [((1 + r)n - 1) / r]

Where P is the initial investment, C is the regular contribution, r is the interest rate per period, and n is the number of periods.

// Compound Interest with Contributions
function calculateCompoundInterest() {
    // Get input values
    const initialInvestment = parseFloat(document.getElementById('initialInvestment').value);
    const monthlyContribution = parseFloat(document.getElementById('monthlyContribution').value);
    const annualReturn = parseFloat(document.getElementById('annualReturn').value) / 100;
    const investmentYears = parseInt(document.getElementById('investmentYears').value);
    
    // Calculate values
    const months = investmentYears * 12;
    const monthlyReturn = annualReturn / 12;
    
    // Calculate future value
    let futureValue = initialInvestment * Math.pow(1 + monthlyReturn, months);
    futureValue += monthlyContribution * 
                  (Math.pow(1 + monthlyReturn, months) - 1) / 
                  monthlyReturn;
    
    // Calculate total contributions and interest earned
    const totalContributions = initialInvestment + (monthlyContribution * months);
    const interestEarned = futureValue - totalContributions;
    
    // Display results
    document.getElementById('compoundFutureValue').textContent = 
        `$${futureValue.toFixed(2)}`;
    document.getElementById('interestEarned').textContent = 
        `$${interestEarned.toFixed(2)}`;
    document.getElementById('totalContributions').textContent = 
        `$${totalContributions.toFixed(2)}`;
}

Compound Interest with Contributions

See how regular contributions to an investment can grow over time with compound interest.

Future Value: $246,726.33

Total Contributions: $77,000.00

Interest Earned: $169,726.33

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