Free online calculators for money, debt, income, and everyday decisions
Clear results. Plain-English insights. No clutter.
Browse by category
🏦
Financial Calculators
Tools for mortgages, debt payoff, budgeting, savings, and compound growth.
💼
Salary Calculators
Convert pay rates, calculate raises, estimate overtime, and understand your real income.
📐
Math Calculators
Percentage, ratio, and everyday math tools for quick, reliable calculations with no friction.
❤️
Health Calculators
BMI, calorie estimates, and health metric tools for general wellness awareness.
Popular calculators
Mortgage CalculatorEnter your loan details below to see your estimated monthly payment and total interest over the life of the loan.Open calculator →Credit Card Payoff CalculatorEnter your balance, interest rate, and monthly payment to see your debt-free date and total interest.Open calculator →Salary to Hourly CalculatorConvert your annual salary to an equivalent hourly wage.Open calculator →BMI CalculatorCalculate your Body Mass Index (BMI) and understand what your result means.Open calculator →Compound Interest CalculatorSee how your money grows with compound interest, including regular contributions.Open calculator →Raise CalculatorCalculate your new annual salary, monthly change, and hourly rate after a raise.Open calculator →
All calculators
Mortgage CalculatorMortgage Payoff CalculatorHome Affordability CalculatorMortgage Income CalculatorRefinance Break-Even CalculatorRent vs Buy CalculatorCredit Card Payoff CalculatorDebt Snowball CalculatorDebt Avalanche CalculatorDebt-to-Income Ratio CalculatorBudget CalculatorSavings Goal CalculatorCompound Interest CalculatorSalary to Hourly CalculatorHourly to Salary CalculatorRaise CalculatorOvertime Pay CalculatorCommission CalculatorPercentage CalculatorBMI CalculatorCost of Living Calculator
Why CalcKarma
📐
Formula-based math
Every result uses a stated formula. No black boxes — you can verify any output.
📋
Transparent assumptions
We document every assumption on every page and link to primary sources.
🔒
Private by design
Calculations happen in your browser. We don't store your inputs.