Time Duration Calculator — Convert Between Time Units
Convert any time duration between seconds, minutes, hours, days, weeks, months, and years. See also Time Calculator and Hours Calculator.
How the Time Duration Calculator Works
This calculator converts a time duration from one unit to all other common time units. It first converts the input value to seconds (the base unit), then divides by the appropriate factor for each target unit. For months and years, average values are used based on the Gregorian calendar (365.2425 days per year, 30.436875 days per month).
Time Unit Conversion Formulas
1 minute = 60 seconds
1 hour = 60 minutes = 3,600 seconds
1 day = 24 hours = 1,440 minutes = 86,400 seconds
1 week = 7 days = 168 hours = 604,800 seconds
1 month (avg) = 30.4369 days = 2,629,746 seconds
1 year (avg) = 365.2425 days = 31,556,952 seconds
Common Duration Conversions Reference
| Duration | Hours | Minutes | Seconds |
|---|---|---|---|
| 1 Day | 24 | 1,440 | 86,400 |
| 1 Week | 168 | 10,080 | 604,800 |
| 1 Month (30d) | 720 | 43,200 | 2,592,000 |
| 1 Quarter (91d) | 2,184 | 131,040 | 7,862,400 |
| 1 Year (365d) | 8,760 | 525,600 | 31,536,000 |
| 1 Decade | 87,600 | 5,256,000 | 315,360,000 |
Solved Examples
Example 1: A video is 7,380 seconds long. How long is that in hours and minutes?
Hours: 7380 / 3600 = 2.05 hours
Remaining: 7380 - (2 x 3600) = 180 seconds = 3 minutes
Answer: 2 hours and 3 minutes (2h 3m 0s).
Example 2: A project estimate is 3.5 weeks. How many days and hours is that?
Days: 3.5 x 7 = 24.5 days
Hours: 3.5 x 168 = 588 hours
Answer: 24.5 days or 588 hours.
Example 3: A flight is 13.5 hours. Express this in days, hours, and minutes.
Days: 13.5 / 24 = 0.5625 days
Breakdown: 13 hours and 30 minutes (0.5 x 60 = 30)
Answer: 0.5625 days, or 13 hours 30 minutes, or 810 minutes.
Practice Questions
1. A sprint is 2 weeks long. How many hours is that?
Answer: 336 hours. 2 weeks x 7 days x 24 hours = 336.
2. A podcast is 4,500 seconds. How many minutes and seconds is that?
Answer: 75 minutes (1 hour 15 minutes 0 seconds). 4500 / 60 = 75 minutes.
3. An SLA guarantees 99.9% uptime per month. How many minutes of downtime is allowed?
Answer: About 43.2 minutes. 30 days x 24h x 60m = 43,200 min; 0.1% of 43,200 = 43.2 minutes.
Common Mistakes to Avoid
Using 30 days per month for precision. Average month is 30.44 days. For exact conversions, use actual calendar dates instead of multiplication.
Confusing milliseconds with seconds. JavaScript timestamps are in milliseconds (13 digits); Unix timestamps are in seconds (10 digits). Divide by 1000 to convert.
Treating decimal output as HH:MM. 2.5 hours = 2h 30m. The .5 means half an hour, not 50 minutes.
Forgetting that year/month conversions are approximate. Use seconds-based conversion for precision; month/year results are averages.
Key Takeaways
- Seconds are the universal base unit for time duration conversions.
- 1 hour = 3,600 seconds; 1 day = 86,400 seconds; 1 week = 604,800 seconds.
- Month and year conversions use averages (30.44 days/month, 365.24 days/year).
- Decimal output means fractional parts, not minutes (0.5 hours = 30 minutes, not 50).
- For exact calendar-based durations, use the Date Calculator instead of fixed multipliers.
Frequently Asked Questions
How do I convert hours to minutes?
Multiply the number of hours by 60. For example, 3.5 hours = 3.5 x 60 = 210 minutes. Enter the value and select "Hours" to see all conversions instantly.
Why are months and years approximate?
Months vary from 28 to 31 days, and years can be 365 or 366 days. The calculator uses the Gregorian average: 30.4369 days per month and 365.2425 days per year. For exact date-based calculations, use the Date Calculator.
How do I convert decimal hours to hours and minutes?
The whole number is hours. Multiply the decimal part by 60 to get minutes. For example, 2.75 hours = 2 hours and (0.75 x 60) = 45 minutes, so 2 hours 45 minutes.
What is the difference between this and the Time Calculator?
The Time Duration Calculator converts a single duration value between units. The Time Calculator performs arithmetic (addition/subtraction) on clock times and finds differences between two specific times.
Can I enter decimal values?
Yes. You can enter any positive decimal number. For example, 1.5 days, 0.25 hours, or 2.333 weeks. The calculator handles fractional values precisely.