Time & Date Calculators

Hours Calculator

Add and subtract hours and minutes for scheduling. Enter time values — see total duration with decimal hours conversion. Free.

Hours & Minutes Calculator

Perform time arithmetic with hours and minutes. Enter your times — see the total with AM/PM format and decimal conversion. Free.

Time Calculator

Add, subtract, multiply, and divide time values. Enter your hours and minutes — see the result with decimal conversion. Free.

Work Hours Calculator

Calculate total work hours for any period. Enter start and end times with breaks — see regular hours, overtime, and weekly totals. Free.

Countdown Timer

Count down to any future date or event. Enter the target date — see days, hours, minutes, and seconds remaining. Free.

Stopwatch Timer

Use a digital stopwatch with lap tracking. Enter laps — see split times, total time, and fastest/slowest lap comparison. Free.

Age Calculator

Calculate exact age in years, months, days, hours, and minutes. Enter date of birth — see your precise age and next birthday. Free.

Date Difference Calculator

Calculate the exact number of days, weeks, and months between two dates. Enter start and end date — see all units with weekday count. Free.

Date Calculator

Add or subtract days, weeks, or months from any date. Enter a date and duration — see the resulting date with day of week. Free.

Days & Business Days

Count days between dates with business days option. Enter start and end dates — see total days, business days, and weekends. Free.

Day of the Week

Find the day of the week for any date in history or the future. Enter the date — see day name, day number, week number, and calendar facts. Free.

How Old Am I?

Calculate your exact age in years, months, days, hours, and minutes. Enter date of birth — see precise age with next birthday countdown. Free.

Time to Decimal

Convert time in hours and minutes to decimal hours. Enter HH:MM — see decimal hours for timesheet, billing, and payroll calculations. Free.

Decimal to Time

Convert decimal hours to hours and minutes. Enter decimal time (e.g. 2.75) — see HH:MM format for timesheets and billing. Free.

Military Time Converter

Convert between 12-hour and 24-hour (military) time. Enter either format — see the other with AM/PM and 24h equivalents. Free.

Hours to Minutes

Convert hours to total minutes. Fast and accurate result with formula, step-by-step method and unit overview. Free tool.

ISO Week Number Calculator

Find the ISO 8601 week number for any date. Enter your date — see week number, year, and first/last day of that week. Free.

Quarter of Year Calculator

Find which fiscal or calendar quarter any date falls in. Enter your date — see quarter number, Q start/end dates, and days remaining. Free.