Time Calculator
Input any amount of time in your preferred unit and instantly see equivalent values across other units.
Use decimals for fractional units (e.g., 2.5 hours).
HH:MM:SS equivalent: 01:00:00
Seconds
3,600
Minutes
60
Hours
1
Days
0.041667
Weeks
0.005952
Instructions
Enter a time and pick a unit
Type the duration and choose seconds, minutes, hours, days, or weeks as the base.
Read the conversions
See exact values in every other unit instantly, plus a HH:MM:SS breakdown.
Apply to your workflow
Use conversions for payroll, productivity tracking, travel planning, or scientific calculations.
Formula
Total Seconds = Input × Unit Seconds
Convert to Target Unit = Total Seconds ÷ Target Unit Seconds
Example: 2.5 hours → 2.5 × 3,600 = 9,000 seconds → 150 minutes → 0.1042 days.
Where Time Conversions Help
- Convert project hours to billable days or weeks.
- Translate daily habits into minutes for habit-tracking apps.
- Understand total travel time across different legs of a trip.
- Balance schedules by comparing hours spent vs. hours remaining.
Common Questions
Can I convert fractional time?
Yes—decimal inputs are fully supported and converted with high precision.
Does it support months or years?
Months and years vary in length, so this tool focuses on fixed-second units. Use a date-based calculator for calendar months.
Can I handle very large values?
Absolutely. The formulas scale linearly, though extremely large numbers may lose fractional precision.
How do I reverse the conversion?
Divide the target unit back by its conversion factor (e.g., minutes × 60 = seconds, seconds ÷ 60 = minutes).
Add, Subtract, and Convert Time
The Time Calculator adds, subtracts, and converts between hours, minutes, and seconds. It handles time arithmetic that is notoriously tricky to do in your head, especially when crossing hour or day boundaries.
This tool is essential for timesheet calculations, project time tracking, cooking schedules, workout planning, and any scenario where you need to add up multiple time durations. It supports both 12-hour and 24-hour formats.
The calculator also provides time zone conversion, elapsed time calculation between two clock times, and the ability to add or subtract time from a specific moment. It automatically handles AM/PM transitions and day rollovers.
Frequently Asked Questions
How do I add hours and minutes?
Enter the time values and click add. The calculator handles carry-over automatically — for example, 2 hours 45 minutes + 1 hour 30 minutes = 4 hours 15 minutes.
Can I calculate elapsed time?
Yes, enter a start time and end time to find exactly how many hours, minutes, and seconds have elapsed.