Time & Productivity Calculators — United States
Calendar arithmetic is the same everywhere; the pages format dates the way your market writes them.
Calendar
Days Between Dates Calculator
Count the days between two dates — and the same gap in weeks, months and years — for deadlines, leases, pregnancies, projects and anniversaries.
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Add or Subtract Days Calculator
What date is 90 days from today? Add or subtract days, weeks, months or years to any date and see the day of the week you land on.
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Day of the Week Calculator
Find the weekday of any date — past or future — with its day of the year, days remaining in the year, ISO week number and whether the year is a leap year.
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Leap Year Calculator
Is a year a leap year? Check any year, see the leap years around it and the rule that decides — every 4 years, except centuries not divisible by 400.
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Unix Timestamp Converter
Convert a Unix timestamp (seconds or milliseconds since 1 January 1970 UTC) to a readable date, or a date to its timestamp.
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Time Zone Converter
What time a moment is somewhere else — with the date difference, the offset between the two places and whether either is on daylight saving.
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Military Time Converter
Convert between the 24-hour clock (military time) and ordinary am/pm time, in both directions — with the decimal hours payroll systems use.
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Week Number Calculator
The ISO 8601 week number for any date — the numbering payroll, retail and manufacturing calendars run on.
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Time and Date Difference Calculator
The exact gap between two dates and times — in days, hours, minutes and every other unit at once.
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Habit Streak Calculator
Your consistency rate, how a streak compares to it, and how long a habit takes to reach a target at your actual completion rate.
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Time Zone Overlap Calculator
How many working hours two locations share, and when that window opens — the arithmetic behind whether a distributed team can actually meet.
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Sunrize and Sunset Calculator
Sunrize, sunset, solar noon and the length of the day for any latitude, longitude and date.
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Quarter Calculator
Which quarter a date falls in — calendar or fiscal — with the quarter’s first and last days, how many days are left in it, and the quarter and year labels planners use.
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Age & anniversaries
Age Calculator
Your exact age in years, months and days — plus total days, weeks and hours lived, the day you were born on, and the countdown to your next birthday.
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Countdown Calculator
How many days, weeks and working days until a date — a wedding, a deadline, a holiday, a birthday — counted from today.
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Age Difference Calculator
The exact age gap between two people from their birth dates — years, months and days, total days and weeks, and who is older.
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Working time
Working Days Calculator
Count the working days between two dates — weekends out, and any public holidays you list taken off — for notice periods, leave, project plans and payroll.
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Hours Worked Calculator
Total hours from clock-in and clock-out times with an unpaid break, in decimal hours and hours:minutes — for timesheets and invoices.
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Time to Decimal Calculator
Convert hours and minutes into decimal hours for a timesheet — and back again.
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Decimal to Time Calculator
Convert decimal hours to hours and minutes and back — the conversion timesheets and payroll systems need constantly.
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Meeting Cost Calculator
What a meeting costs in salary time — per meeting, per year if it recurs, and what a shorter one would save.
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Project Timeline Calculator
How long a project takes from the effort it needs, the people on it and the coordination overhead that adding people creates.
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Deadline Countdown Calculator
How many working days remain to a deadline, and the daily rate of progress needed to finish on time.
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Pomodoro Planner Calculator
How many focus blocks fit in a working session, how much genuine focus time that is, and how long a task takes in blocks.
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Commute Time and Cost Calculator
What a commute takes over a year — the hours, the days they add up to, the fares or fuel and parking, and what the time is worth at your hourly value — with the saving from working from home some days.
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RICE Score Calculator
The RICE score of a piece of work — reach times impact times confidence, divided by effort — and the same for a second item so the two rank against each other, with what each factor contributes and what would change the order.
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Outsourcing Break-Even Calculator
Whether to do a task yourself or pay for it — the value of your hour against what the task costs to outsource, allowing for how much longer it takes you and what you would do with the time — with the yearly saving either way.
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PERT Estimate Calculator
A three-point (PERT) estimate for a task from its optimistic, most likely and pessimistic durations — the expected time, its standard deviation, and how long to allow for 80%, 90% and 95% confidence.
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Goal Progress Calculator
Whether a goal is on track: how far along you are against how much time has passed, the daily pace you now need, and when you would finish at your current rate.
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WSJF Calculator
Weighted Shortest Job First scores for up to two pieces of work — cost of delay divided by job size — and which to do first.
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Value of Your Time Calculator
What an hour — and a minute — of your time is worth from your income and hours, and whether paying someone to save you a chunk of time is worth it.
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Meeting Load Calculator
How much of your working week meetings take, what that is over a year, and how much uninterrupted focus time is actually left once the gaps between them are counted.
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Time Duration Calculator
Hours and minutes between two times.
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About these calculators
These calculators use the proleptic Gregorian calendar and count in whole days at UTC, so daylight-saving changes never add or lose an hour. Working-day counts exclude weekends only; public holidays vary by state and are not applied.