Dividing by 24
days = hours ÷ 24, hours = days × 24
Divide hours by 24 for the decimal answer. For "days and hours," the whole part is full days and the remainder is leftover hours: 36 hours = 1 day 12 hours, because 36 ÷ 24 = 1 remainder 12.
Quick reference
| Hours | Days | As days & hours |
|---|---|---|
| 12 | 0.5 | Half a day |
| 24 | 1 | 1 day |
| 36 | 1.5 | 1 day 12 hr |
| 48 | 2 | 2 days |
| 72 | 3 | 3 days |
| 96 | 4 | 4 days |
| 120 | 5 | 5 days |
| 168 | 7 | 1 week |
| 240 | 10 | 10 days |
Where the count and the calendar diverge
- 72 hours vs "3 days." Seventy-two hours is precisely 3 × 24, running through the clock. A "3-day pass" counted as calendar days can be shorter — Friday to Monday spans four dates but far fewer than 72 elapsed hours.
- A person-day is 8 hours, not 24. In project estimates one work day is 8 hours, so a "5 person-day" task is 40 hours of work — not 120.
- "Every 8 hours" is not "three times a day." Eight-hour intervals cover the full 24 hours, night included; "three times a day" usually fits into waking hours only.
Common questions
How many days is 72 hours?
72 hours is exactly 3 days (72 divided by 24). It comes up in medicine, where a dose "every 72 hours" means once every 3 days, and in 72-hour visa and return windows.
How many days is 48 hours?
48 hours is 2 days. Likewise 24 hours is 1 day, 96 hours is 4 days, and 168 hours is a full week.
How many work hours are in a year?
At 40 hours a week, a year is 2080 hours before any time off. After holidays, vacation and sick leave, the real figure is usually around 1800 to 1900 hours.
