Everyday Math
Simple, fast calculators for standard arithmetic, percentages, dates, exact ages, and durations. Designed for quick answers on desktop and mobile with keyboard support.
Standard Calculator
Free online basic calculator with complete keyboard support, calculation history, and clean display.
Open calculator →Percentage Calculator
Calculate percentages easily: find X% of Y, what % X is of Y, or percentage increase and decrease.
Open calculator →Age Calculator
Calculate exact age in years, months, days, total days lived, and countdown to your next birthday.
Open calculator →Date Calculator
Calculate exact days between two dates, or add/subtract days, weeks, and months from any date.
Open calculator →Time Duration Calculator
Add or subtract hours, minutes, and seconds, calculate time elapsed between two times, and convert decimal hours.
Open calculator →How to choose a everyday math calculator
Pick the tool that matches your question, read the how-it-works section on that page for assumptions and limits, then adjust inputs until the scenario looks like your real numbers. Results are for education and planning—not personalized professional advice.
- Standard Calculator — Free online basic calculator with complete keyboard support, calculation history, and clean display.
- Percentage Calculator — Calculate percentages easily: find X% of Y, what % X is of Y, or percentage increase and decrease.
- Age Calculator — Calculate exact age in years, months, days, total days lived, and countdown to your next birthday.
- Date Calculator — Calculate exact days between two dates, or add/subtract days, weeks, and months from any date.
- Time Duration Calculator — Add or subtract hours, minutes, and seconds, calculate time elapsed between two times, and convert decimal hours.