How many days are in one hour?

There are 0.041666667 days in 1 hour.

How do you convert days to hours?

Multiply the number of days by 24 — or use the formula h = d × 24.

What is 30 days in hours?

30 days is 720 hours. 30 × 24 = 720 hours.

Is the days to hours conversion exact?

Yes. The relationship is fixed by definition, so 24 is an exact conversion factor — only the displayed result is rounded.

Days to Hours Converter

Convert days to hours instantly with this free days to hours converter. Enter any value to get an accurate time conversion, plus the formula, the conversion factor and a full reference table.

What is 1 day in hours?

1 day is equal to exactly 24 hours.

1 × 24 = 24 hours

Amount

Result24

1 day = 24 hours

Days to Hours formula

h = d × 24

The days to hours conversion factor is 24, which is exact by definition. 1 day = 24 hours, and 1 hour = 0.041666666667 days.

Worked examples

2 days = 48 hours — 2 × 24 = 48 hours
30 days = 720 hours — 30 × 24 = 720 hours
100 days = 2,400 hours — 100 × 24 = 2,400 hours

Days to Hours conversion table

Every value below is calculated with the exact conversion factor and rounded for display.

days to hours conversion table
Days (d)	Hours (h)
1 d	24 h
2 d	48 h
5 d	120 h
10 d	240 h
15 d	360 h
30 d	720 h
45 d	1,080 h
60 d	1,440 h
90 d	2,160 h
100 d	2,400 h
365 d	8,760 h
1,000 d	24,000 h

When you need to convert days to hours

Converting durations in project plans, billing sheets and race results.
Setting timeouts, cache lifetimes and cron intervals in software.

Common mistakes to avoid

Dividing when you should multiply. Because 1 day = 24 hours, the answer should be larger than the number you started with.
Rounding too early. Convert first at full precision, then round the final answer to the precision the task actually needs.

How precise does the answer need to be?

Round only at the end, and only to the precision your task actually needs. The converter above keeps full double precision internally and rounds for display.

How these units are defined

Day (d): 24 hours. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
Hour (h): Sixty minutes. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.

Frequently asked questions

What is 1 day in hours?: 1 day is equal to 24 hours.
How many days are in one hour?: There are 0.041666667 days in 1 hour.
How do you convert days to hours?: Multiply the number of days by 24 — or use the formula h = d × 24.
What is 30 days in hours?: 30 days is 720 hours. 30 × 24 = 720 hours.
Is the days to hours conversion exact?: Yes. The relationship is fixed by definition, so 24 is an exact conversion factor — only the displayed result is rounded.