Compound interest, mortgages, loans, savings goals, retirement — every number you need to make smarter money decisions.
THE CALCULATORS
Calculate compound interest, model mortgage payments, plan your retirement, pay off debt faster, and compare savings options — all free, all instant, no sign-up required. Use the filters below to browse by category, or scroll through all 24 calculators at once.
Browse all 24 free financial calculators
InterestCalculators.net gives you instant, accurate answers across every major area of personal finance — from compound interest and mortgage payments to retirement planning, credit card payoff, and salary comparisons. Every calculator runs entirely in your browser using JavaScript — no account required, no data collected, and no personal information ever sent to a server. Open a calculator, enter your numbers, and get your answer in seconds.
Our compound interest calculator lets you model investment growth with any compounding frequency — daily, monthly, or annually — and see the full year-by-year breakdown. The mortgage calculator gives you your monthly payment, total interest paid, and a complete amortization schedule, while the mortgage refinance calculator shows whether refinancing actually saves you money after factoring in closing costs and your break-even point. Use the HELOC calculator to estimate home equity line payments during both the draw and repayment periods.
For savings and investment goals, the savings calculator projects how regular contributions grow over time, while the investment future value calculator handles lump-sum growth with adjustable rates and time horizons. The CAGR calculator measures the compound annual growth rate of any investment over any period, and the inflation calculator shows you the real purchasing power of a dollar across decades. Planning for retirement? The retirement calculator combines your current savings, expected contributions, and projected returns to tell you whether you're on track — and by how much.
Managing debt is just as important as building wealth. The credit card payoff calculator compares the avalanche and snowball methods side by side, while the debt-to-income ratio calculator shows lenders — and you — exactly where you stand. The loan calculator covers personal loans, auto loans, and student loans with full amortization tables, and the APY / APR calculator converts between the two rates so you can compare financial products accurately. Whether you're calculating a pay raise with the salary calculator, estimating a CD return with the CD rate calculator, or splitting a check with the tip calculator — every tool here is free, fast, and built to give you a clear answer without the clutter.