Time converter
Days to Hours
If you need to know how many Hours one Days contains, the answer is 24. The conversion is linear, so 10 d is 240 hr and 100 d is 2,400 hr. Use the converter for any other value.
Formula 1 d = 24 hr
Need the other direction? Hours to Days.
How to convert Days to Hours
A day is 24 hours, or 86,400 seconds, ignoring leap seconds. An hour is 60 minutes, or 3,600 seconds.
To convert Days to Hours, multiply the value in d by 24. For example, 10 d × 24 = 240 hr. This works because the ratio between the two units is constant for every value in time.
Worked examples
| d | hr |
|---|---|
| 1 d | 24 hr |
| 2.5 d | 60 hr |
| 5 d | 120 hr |
| 10 d | 240 hr |
| 25 d | 600 hr |
| 50 d | 1,200 hr |
| 100 d | 2,400 hr |
Reverse conversion
| hr | d |
|---|---|
| 1 hr | 0.04166667 d |
| 5 hr | 0.20833333 d |
| 10 hr | 0.41666667 d |
| 25 hr | 1.041667 d |
| 50 hr | 2.083333 d |
| 100 hr | 4.166667 d |
When this conversion is useful
This is the calculation you need when you are planning a project, a sprint or a schedule and need consistent units. Because the factor is fixed, you can use the same number for a single measurement or for a batch: 1,000 d is 24,000 hr.
Is the conversion exact?
Seconds, minutes, hours, days and weeks are exact. Months and years here use average Julian values (30.4375 days and 365.25 days), so a calendar conversion can differ slightly.
Reference: BIPM SI Brochure and NIST SP 811. Last reviewed: 2026-11-01.
d to hr conversion chart
The chart lists the most requested values. For a value that is not here, use the converter at the top of the page.
| Days (d) | Hours (hr) |
|---|---|
| 1 d | 24 hr |
| 2 d | 48 hr |
| 3 d | 72 hr |
| 4 d | 96 hr |
| 5 d | 120 hr |
| 6 d | 144 hr |
| 7 d | 168 hr |
| 8 d | 192 hr |
| 9 d | 216 hr |
| 10 d | 240 hr |
| 11 d | 264 hr |
| 12 d | 288 hr |
| 13 d | 312 hr |
| 14 d | 336 hr |
| 15 d | 360 hr |
| 16 d | 384 hr |
| 17 d | 408 hr |
| 18 d | 432 hr |
| 19 d | 456 hr |
| 20 d | 480 hr |
| 21 d | 504 hr |
| 22 d | 528 hr |
| 23 d | 552 hr |
| 24 d | 576 hr |
| 25 d | 600 hr |
| 26 d | 624 hr |
| 27 d | 648 hr |
| 28 d | 672 hr |
| 29 d | 696 hr |
| 30 d | 720 hr |
| 31 d | 744 hr |
| 32 d | 768 hr |
| 33 d | 792 hr |
| 34 d | 816 hr |
| 35 d | 840 hr |
| 36 d | 864 hr |
| 37 d | 888 hr |
| 38 d | 912 hr |
| 39 d | 936 hr |
| 40 d | 960 hr |
| 41 d | 984 hr |
| 42 d | 1,008 hr |
| 43 d | 1,032 hr |
| 44 d | 1,056 hr |
| 45 d | 1,080 hr |
| 46 d | 1,104 hr |
| 47 d | 1,128 hr |
| 48 d | 1,152 hr |
| 49 d | 1,176 hr |
| 50 d | 1,200 hr |
| 60 d | 1,440 hr |
| 70 d | 1,680 hr |
| 80 d | 1,920 hr |
| 90 d | 2,160 hr |
| 100 d | 2,400 hr |
Frequently asked questions
How many Hours are in 1 Days?
1 d equals 24 hr.
How do I convert Days to Hours?
Multiply the d value by 24. Example: 25 d = 600 hr.
What is 2.5 d in hr?
2.5 d = 60 hr.
Is the d to hr conversion exact?
Seconds, minutes, hours, days and weeks are exact. Months and years here use average Julian values (30.4375 days and 365.25 days), so a calendar conversion can differ slightly.
Does the calculator work offline?
Yes. The conversion runs in your browser with JavaScript, so it works after the page has loaded, even without a connection.