Day to Hour Converter (d to hr)

Type a value above and it converts instantly — no button to press, no page reload, and the math runs entirely in your browser.

Quick answer: one day equals 24 hours. So to convert days to hours, multiply by 24.

How to convert days to hours

hours = days × 24

The civil day is exactly 86,400 seconds. Earth's actual rotation drifts slightly, which is why leap seconds occasionally exist.

The hour (3,600 seconds) divides the day into 24 parts, a convention inherited from ancient Egyptian astronomy.

Day to Hour conversion table

Day (d)	Hour (hr)
0.01 d	0.24 hr
0.1 d	2.4 hr
0.25 d	6 hr
0.4 d	9.6 hr
0.75 d	18 hr
1.25 d	30 hr
1.75 d	42 hr
2.5 d	60 hr
3.5 d	84 hr
4.5 d	108 hr
6 d	144 hr
8 d	192 hr
10 d	240 hr
12 d	288 hr
14 d	336 hr
16 d	384 hr
18 d	432 hr
20 d	480 hr
24 d	576 hr
26 d	624 hr
30 d	720 hr
35 d	840 hr
45 d	1,080 hr
55 d	1,320 hr
65 d	1,560 hr
75 d	1,800 hr
85 d	2,040 hr
95 d	2,280 hr
110 d	2,640 hr
125 d	3,000 hr
175 d	4,200 hr
250 d	6,000 hr
350 d	8,400 hr
450 d	10,800 hr
600 d	14,400 hr
750 d	18,000 hr
900 d	21,600 hr
1,500 d	36,000 hr
2,500 d	60,000 hr
10,000 d	240,000 hr

Need the opposite direction? Use the Hour to Day converter, or read our complete guide to time conversions for every formula in one place.

Frequently asked questions

How many hours are in one day?

One day equals 24 hours. Multiply any day value by 24 to get hours.

What is 10 days in hours?

10 days equal 240 hours (10 × 24).

Is the day to hour conversion exact?

The conversion factor used here (24) is based on the internationally agreed definitions of both units, so results are exact up to rounding of the final decimal places.

Is my data stored when I use this converter?

No. The conversion runs entirely in your browser with JavaScript — nothing you type is sent to a server, logged or stored.