Finance Calculator

Loan, mortgage, savings, ROI — instant results right in your browser

Loan payment calculator

Loan amount ($)

Annual interest rate (%)

Loan term (months)

—Monthly Payment

—Total Paid

—Total Interest

About these finance calculators

This free finance calculator covers four essential personal finance calculations: loan payments, mortgage estimates, savings growth with compound interest, and return on investment. All calculations run instantly in your browser with no data sent to any server. The math is based on standard financial formulas used by banks and financial planners worldwide.

Whether you are planning a car loan, modeling your investment growth, estimating a mortgage payment, or calculating the ROI on a business decision, this calculator gives you the numbers you need in seconds.

Understanding each calculator

Loan Calculator

The loan calculator uses the standard amortization formula to calculate your monthly payment based on loan amount, annual interest rate, and loan term in months. It also shows your total payment over the life of the loan and the total interest paid — which is often a surprising number that motivates people to make extra payments or choose a shorter term.

Mortgage Calculator

Enter the home price, down payment, interest rate, and loan term to see your estimated monthly mortgage payment, total amount paid over the life of the loan, and your loan-to-value ratio. The LTV ratio matters because lenders typically require private mortgage insurance when LTV exceeds 80 percent.

Savings Growth Calculator

This calculator shows the power of compound interest over time by combining a starting deposit with regular monthly contributions and a compound growth rate. The interest earned figure shows how much of your final balance comes from investment returns rather than your own contributions — a number that powerfully illustrates why starting early matters.

ROI Calculator

Enter your initial investment, total return, and time period to calculate your return on investment percentage, net profit in dollars, and annualized return rate. ROI is one of the most widely used metrics for evaluating the efficiency of an investment or comparing different investment options.

Tips for using these calculators

For the loan calculator, try reducing the term by 6 to 12 months to see how much total interest you save — the difference is often significant.
For savings growth, adding even a small monthly contribution dramatically increases the final result compared to a lump sum alone.
For mortgage calculations, remember that your actual monthly payment will also include property taxes, homeowners insurance, and potentially PMI.
For ROI, a high-yield savings account currently offers 4 to 5 percent annual interest — use this as your baseline to compare other investments.

Frequently asked questions

How accurate is the loan calculator?

The loan calculator uses the standard amortization formula and is accurate for fixed-rate loans. Results may differ slightly from your actual lender figures due to rounding, fees, or different day-count conventions. Always verify with your lender before making financial decisions.

What interest rate should I use for savings growth?

For a high-yield savings account, use 4 to 5 percent. For a diversified stock index fund over a long time horizon, 7 percent is a commonly used estimate based on historical averages after inflation. For bonds, 3 to 4 percent is typical. These are estimates, not guarantees.

Does this calculator account for taxes or inflation?

No. These calculators use nominal pre-tax figures. For a real-world picture, reduce your expected return by 2 to 3 percent to account for inflation, and consult a tax professional for your specific situation.

Is this financial advice?

No. This calculator is a planning tool for educational purposes only. The results are mathematical estimates based on the numbers you enter. Always consult a qualified financial advisor before making significant financial decisions.