Financial Calculators
Plan big money decisions with confidence. These calculators cover borrowing, saving, investing, retirement and taxes, and each one shows the formula it uses so you can check the math.
21 free calculators · no sign-up · results stay in your browser
- Mortgage Calculator Popular Monthly payment with taxes, insurance, PMI and an amortization schedule.
- Loan Calculator Popular Payment, total interest and payoff date for any fixed-rate loan, with a yearly schedule.
- Auto Loan Calculator Popular Monthly car payment with trade-in, sales tax, fees and a term-by-term comparison.
- Amortization Calculator Full monthly amortization schedule with yearly totals and extra-payment savings.
- Compound Interest Calculator Popular Growth with contributions, any compounding frequency, APY and the A = P(1 + r/n)^nt working.
- Income Tax Calculator Popular 2026 federal income tax with bracket breakdown, marginal and effective rate.
- Paycheck Calculator Popular Take-home pay per check after federal, FICA and state tax, 401(k) and health premiums.
- Simple Interest Calculator Interest and total amount with I = Prt, in years, months or days, with steps.
- Salary Calculator Convert hourly, weekly, biweekly, monthly and annual pay with your own hours.
- Savings Calculator Future balance, months to reach a goal, or the monthly deposit you need, at any APY.
- Investment Calculator Project portfolio growth with contributions, yearly increases and today's-dollar value.
- Retirement Calculator Projected savings vs. what you need, with inflation, Social Security and a shortfall fix.
- 401(k) Calculator Balance at retirement with employer match, raises and 2026 contribution limits.
- Inflation Calculator Future cost of today's money and the value of past money, at any average inflation rate.
- Credit Card Payoff Calculator Months to pay off a card, the payment for a target date, and the true cost of minimums.
- Sales Tax Calculator Add tax to a price, remove it from a total, or find the rate from a receipt.
- Debt-to-Income Ratio Calculator Front-end and back-end DTI checked against the 28/36 rule, FHA and Fannie Mae limits.
- Profit Margin Calculator Gross profit, margin and markup from cost and price, or the price for a target margin.
- CAGR Calculator Compound annual growth rate from start and end values, or the end value from a rate.
- Home Affordability Calculator Maximum home price from your income and debts (28/36 or FHA) or from a monthly budget.
- ROI Calculator ROI percentage, net gain and annualized ROI from amounts invested and returned.
About these calculators
Most money decisions come down to a handful of formulas: how interest compounds, how a loan amortizes, and how taxes take a share of income. These calculators apply those formulas to your numbers. Use the mortgage calculator to see the full monthly cost of a home, including property tax, insurance and PMI. The compound interest calculator projects savings growth, and the paycheck calculator estimates take-home pay after federal tax and FICA.
Every borrowing calculator shows total interest, not just the monthly payment. A lower payment over a longer term often costs far more over the life of the loan. The savings and retirement tools let you change the return, contributions and time horizon so you can see which lever matters most for your goal. In most cases it is time.
U.S. tax calculators use the 2026 federal brackets and standard deduction published by the IRS. Calculators that are not tied to one country let you switch currency between US dollars, rupees, euros, pounds and Canadian and Australian dollars. For Indian products such as SIP, PPF, FD and GST, see our India finance calculators.
These tools are for planning and education. Lenders, employers and tax authorities apply their own rules, fees and rounding, so check important numbers with them before you commit.
A few rules of thumb are worth knowing before you start. The 28/36 guideline keeps housing costs under 28% of gross income and all debt payments under 36%. The rule of 72 says money doubles in about 72 ÷ rate years, so roughly 10 years at 7%. And on most loans, early payments are mostly interest, which is why extra payments made early save the most.