Convert days to hours
Input the number of days you want to convert to hours.
How to Convert Days to Hours
The day and hour are both units of time. By definition, 1 day equals exactly 24 hours. This means to convert days to hours, you multiply by 24.
Formula
Step-by-Step Example
Convert 5 d to hours:
We need to convert days to hours
Since 1 d = 24 h, multiply by 24
5 × 24 = 120
5 d = 120 h
Day to Hour Conversion Table
Quick reference table for common day to hour conversions. Click any value for detailed calculation.
| Days (d) | Hours (h) |
|---|---|
| 1 d | 24 h |
| 2 d | 48 h |
| 5 d | 120 h |
| 10 d | 240 h |
| 15 d | 360 h |
| 20 d | 480 h |
| 25 d | 600 h |
| 50 d | 1200 h |
| 100 d | 2400 h |
About These Units
Day (d)
A day (d) equals 24 hours or 86,400 seconds, based on Earth's rotation. Days measure deadlines, project timelines, medication schedules, and vacation lengths. A solar day varies slightly; the mean solar day defines our 24-hour clock. There are 365.25 days in a year on average.
Hour (h)
An hour (h or hr) equals 60 minutes or 3,600 seconds. Hours structure our daily lives: work schedules, sleep (7-9 hours recommended), travel times, and time zones. There are 24 hours in a day, 168 hours in a week, approximately 8,760 hours in a year.
Frequently Asked Questions
How do I convert days to hours?
To convert days to hours, multiply the value by 24. For example, 10 d = 240 h.
How many hours are in 1 day?
1 day equals 24 hours.
What is the formula for days to hours?
The formula is: h = d × 24.