Free online calculators for everyday decisions
Precise calculators with step-by-step explanations that make complex numbers easy to understand.
Investing & retirement
Featured calculators
Our most popular tools right now.
Compound interest calculator
Compound interest is interest on your interest. Enter a starting amount, a rate, and how long you save — then watch the balance build.
Open calculatorCalorie calculator
Enter your weight, height, age, and sex, pick an activity level and a goal, and the calculator estimates the calories you need each day, along with your maintenance level and BMR.
Open calculatorHow much house can I afford
Enter your annual income, monthly debts, down payment, interest rate, and term. The calculator uses the 28/36 affordability rule to estimate the home price, the maximum monthly payment, and the loan it supports.
Open calculatorPercentage calculator
Three common percentage questions in one place. Pick a mode, type two numbers, and the answer updates as you go. The field labels show which number is the percentage, part, whole, old value, or new value.
Open calculatorMore than just results
WiseCalcs goes a step further and explains the why behind every result, so you can make informed decisions with confidence.
- Step-by-step guides to complex financial concepts.
- Science-based health calculations.
- Transparent mathematical models.