What this calculator does
Pick any two moments — a project kickoff and its deadline, a departure and an arrival, clocking in Friday night and out Saturday morning — and get the exact elapsed time between them. The result is shown as a breakdown (days, hours, minutes) and as totals in single units (total hours, total minutes, total seconds), which is what you need for billing, SLAs, and logs.
Handy time-unit reference
| Unit | Equals |
|---|---|
| 1 day | 24 hours = 1,440 minutes = 86,400 seconds |
| 1 week | 168 hours = 10,080 minutes |
| 30-day month | 720 hours |
| 1 year (common) | 8,760 hours; leap year 8,784 |
Worked example
A support ticket opens Tuesday at 4:20 PM and closes Thursday at 10:05 AM. Duration: 1 day, 17 hours, 45 minutes — or 41.75 total hours. If your SLA promises resolution within 48 hours, you made it with 6 hours 15 minutes to spare.
A note on daylight saving time
This tool uses your device's clock. On the night the US "springs forward" (second Sunday in March), 11:00 PM to 7:00 AM is only 7 elapsed hours by wall clock; on "fall back" night it's 9. If you bill absolute elapsed time across a DST boundary, confirm which convention your client or payroll uses.