Every calculator
you need.
Fast, free, no-nonsense calculators for everyday math. Just open and calculate.
Salary Calculator
Convert between annual salary and hourly rate. Adjust hours per week and weeks per year for accurate breakdowns.
OpenPercentage Calculator
Three handy percentage calculations in one place. Find percentages, reverse-calculate, and compare changes.
OpenTip Calculator
Calculate the tip and split the bill. Choose a preset or enter a custom tip percentage.
OpenCompound Interest Calculator
See how your investments grow over time. Enter your starting amount, monthly contributions, interest rate, and time horizon.
OpenBMI Calculator
Calculate your Body Mass Index. Toggle between metric and imperial units to get your BMI category.
OpenUnit Converter
Convert between length, weight, and temperature units. Switch categories and see results instantly.
OpenMortgage Calculator
Calculate your monthly mortgage payment and view a full amortization schedule with principal and interest breakdown.
OpenAge Calculator
Calculate exact age or time between any two dates in years, months, and days. Enter your birth date to find your precise age.
OpenCalorie Calculator
Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) based on your personal stats and activity level.
OpenLoan Payoff Calculator
Calculate your loan payoff timeline and see exactly how much time and money you save with extra payments.
OpenGPA Calculator
Calculate your cumulative GPA on a 4.0 scale. Add your courses with grades and credit hours to see your grade point average.
OpenDiscount Calculator
Calculate the sale price after a discount. Enter the original price and discount percentage to see how much you save.
OpenSales Tax Calculator
Calculate the sales tax amount and total price. Enter the pre-tax price and your local tax rate.
OpenDate Calculator
Calculate the number of days between two dates or add/subtract days from a date. See results in days, weeks, and months.
OpenInflation Calculator
Calculate how inflation affects purchasing power over time. See how the value of money changes between any two years.
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