Date & Time
Free date and time calculators for age, date differences, durations and hours. Every result comes with the method, so you can check the arithmetic by hand.
26 calculators
Date arithmetic
Day of the Week CalculatorFind the weekday for any past or future date.Date CalculatorDays, months and years between two dates.Add Days CalculatorAdd or subtract days, weeks, months or years.Leap Year CalculatorWhether a year is a leap year, and why.Business Days CalculatorWorking days between two dates, weekends excluded.Calendar CalculatorA month at a glance, plus the day of the week for a date.Month CalculatorMonths between two dates, and the date months from now.Time Until CalculatorTime remaining until a date, in every unit.Wedding Countdown CalculatorDays left until a wedding date, and the date milestones.Years Between Dates CalculatorYears, months and days between two dates.
Age
Age CalculatorWork out your exact age in years, months, days and seconds.Age Difference CalculatorExact age difference between two dates.Birthday CalculatorDays until your next birthday, and the weekday it falls on.Chronological Age CalculatorAge in years and months, adjusted for babies born early.Anniversary CalculatorWhich anniversary a date falls on, and the gift for it.BC to AD CalculatorYears between a BC date and an AD date, with no year zero.
Durations
Hours CalculatorTotal the hours worked across a week, with breaks deducted.Time Duration CalculatorFind the hours and minutes between two times.Time to Decimal CalculatorConvert hours and minutes into decimal hours for payroll.Day CounterCount the days between two dates, inclusive or not.Decimal to Time CalculatorConvert decimal hours into hours, minutes and seconds.Hours and Minutes CalculatorAdd and subtract hours and minutes, with carries.Work Hours CalculatorHours worked from start and end times, minus breaks.
Time zones & world time
Other categories
Every calculator on CalcMax, grouped by what you are trying to work out.
MathPercentages, fractions, geometry, algebra and number bases.FinanceLoans, mortgages, interest, tax and investment returns.PhysicsMotion, forces, electricity, thermodynamics and optics.Health & FitnessBMI, calories, body fat, heart rate and nutrition targets.StatisticsAverages, standard deviation, probability and grade curves.ConstructionConcrete, gravel, mulch, paint, tile and square footage.BiologyGenetics, populations, microbiology and animal dosing.SportsPace, splits, running and cycling performance metrics.ChemistryMolarity, dilutions, reactions and stoichiometry.Food & CookingRecipe scaling, baking ratios, cooking conversions.ElectronicsOhm's law, resistors, wire gauge, batteries and signals.AutomotiveFuel cost, gas mileage and trip planning.OtherBra sizing and random password generation.