All calculators
15 calculators across 6 categories. Search below, or browse by category.
Date Calculators
Add, subtract, compare and identify dates.
-
Date Difference Calculator
Find the exact gap between two dates in every useful unit.
-
Days Between Dates Calculator
Count the days between two dates, with a full weekday breakdown.
-
Add or Subtract Days from a Date
Add or subtract days, weeks, months or years from any date.
-
Week Number Calculator
Find the ISO week number for a date, or the dates in a week.
Time Calculators
Calculate durations, hours, shifts and timesheets.
-
Time Duration Calculator
Measure the time between two clock times, even past midnight.
-
Hours Worked Calculator
Work out paid hours from a shift, after unpaid breaks.
-
Timesheet Calculator
Total a week of shifts, with breaks, overtime and pay.
Business Day Calculators
Calculate working days, deadlines and notice periods.
-
Working Days Between Dates
Count business days between dates, excluding holidays.
-
Add Working Days to a Date
Move forward or back by working days, skipping holidays.
-
Deadline Calculator
Set a deadline in working or calendar days and track it.
Time Zone Calculators
Convert times and plan international meetings.
-
Time Zone Converter
Convert a time between any two cities, with DST handled.
-
Meeting Time Planner
Find meeting slots that work across several countries.
Age and Event Calculators
Calculate ages, anniversaries and countdowns.
-
Exact Age Calculator
Calculate an exact age in years, months and days.
-
Birthday Countdown
Count down to the next birthday, day by day.
Developer Date Tools
Convert timestamps, UTC values and date formats.
-
Unix Timestamp Converter
Convert epoch timestamps to dates and back, in any unit.
Alphabetical list
| Calculator | Category | What it does |
|---|---|---|
| Add or Subtract Days from a Date | Date | Add or subtract days, weeks, months or years from any date. |
| Add Working Days to a Date | Business Days | Move forward or back by working days, skipping holidays. |
| Birthday Countdown | Age and Events | Count down to the next birthday, day by day. |
| Date Difference Calculator | Date | Find the exact gap between two dates in every useful unit. |
| Days Between Dates Calculator | Date | Count the days between two dates, with a full weekday breakdown. |
| Deadline Calculator | Business Days | Set a deadline in working or calendar days and track it. |
| Exact Age Calculator | Age and Events | Calculate an exact age in years, months and days. |
| Hours Worked Calculator | Time | Work out paid hours from a shift, after unpaid breaks. |
| Meeting Time Planner | Time Zones | Find meeting slots that work across several countries. |
| Time Duration Calculator | Time | Measure the time between two clock times, even past midnight. |
| Time Zone Converter | Time Zones | Convert a time between any two cities, with DST handled. |
| Timesheet Calculator | Time | Total a week of shifts, with breaks, overtime and pay. |
| Unix Timestamp Converter | Developer Tools | Convert epoch timestamps to dates and back, in any unit. |
| Week Number Calculator | Date | Find the ISO week number for a date, or the dates in a week. |
| Working Days Between Dates | Business Days | Count business days between dates, excluding holidays. |
Not here yet
This is a deliberately focused launch set rather than every tool we could build. Notice periods, pay dates, shift patterns, flight arrival times, anniversary calculators, date format conversion and a daylight-saving checker are all planned. If something you need is missing, tell us — what people actually ask for decides what gets built next.