Free online financial calculators for mortgages, loans, investments, retirement, and budgeting. Plan your financial future with our easy-to-use tools.
Calculate monthly mortgage payments, total interest, and amortization schedule for home loans.
Open Tool LoanEstimate car loan payments with down payment, trade-in value, and interest rate options.
Open Tool LoanPlan your student loan repayment with multiple payment scenarios and interest savings.
Open Tool DebtCreate a debt elimination plan with avalanche or snowball method to become debt-free faster.
Open Tool DebtCalculate how long to pay off credit card debt and how much interest you'll pay.
Open ToolDetermine how much to save monthly to reach your financial goals on time.
Open Tool InvestmentCalculate compound returns on stocks, mutual funds, and other investments.
Open Tool InvestmentEstimate how much you need to save for retirement and if you're on track.
Open ToolConvert between hourly, monthly, and annual salary with tax estimates.
Open Tool BudgetCreate a monthly budget with the 50/30/20 rule and track your spending categories.
Open Tool TaxEstimate your income tax liability and take-home pay after deductions.
Open Tool InvestmentCalculate return on investment and annual returns.
Open Tool CryptoCalculate cryptocurrency gains, losses, and ROI.
Open Tool CurrencyConvert between 150+ world currencies instantly.
Open ToolThese finance calculators are designed for planning, comparison, and education. Use them to estimate payments, compare scenarios, and understand how interest, time, and contribution amounts affect the result.
For decisions involving taxes, investments, loans, or retirement, verify the numbers against official statements and consult a qualified professional when the outcome matters.
Use realistic interest rates, loan terms, fees, taxes, contribution amounts, and time horizons. Small changes can produce large differences over long periods, especially for mortgage, investment, and retirement calculations.
When comparing multiple options, keep the assumptions consistent so the result shows the difference between the choices rather than the difference between your inputs.
Calculations run in your browser whenever possible. Knexio calculators are free to use and do not require an account.
The results are estimates, not financial advice. They may not include every fee, tax rule, market condition, or lender-specific requirement.