Date & time
Date CalculatorAdd or subtract days, weeks, months and years, or count the days between two dates.
Days From TodayWhat date is 30, 60 or 90 days from today — or ago?
Age CalculatorYour exact age in years, months and days, plus your next birthday.
Time CalculatorAdd and subtract hours and minutes, or find the time between two times.
Hours & Time Card CalculatorTotal your weekly work hours with breaks, overtime and pay.
How Long UntilLive countdown to any time of day.
Money & work
Paycheck Calculator2026 take-home pay after federal tax, Social Security, Medicare and state tax.
Hourly to SalaryConvert hourly pay to yearly salary, and back again.
Percentage CalculatorPercent of a number, what percent, increase and decrease.
Percent ChangePercentage increase, decrease and difference between two values.
School & math
Grade CalculatorWeighted class grade with letter grade and GPA points.
Final Grade CalculatorWhat you need on the final to get the grade you want.
Test Score CalculatorScore percentage and a full grading chart for any test.
Fraction CalculatorAdd, subtract, multiply and divide fractions with steps.
Decimal to FractionConvert decimals to fractions and fractions to decimals.
Text tools
Random pickers & games
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Why use these tools?
Counting days on a calendar is slow and easy to get wrong — months have different lengths, leap years add a day, and it's hard to remember whether to include today. Every tool here does the work instantly in your browser using your own time zone. Nothing you type is sent to a server, and random results use your browser's secure random number generator so they're genuinely fair.