Convert Days to Hours
Days to hours is the conversion you reach for when a schedule, trip, or deadline is written in days but you need to plan it hour by hour. One day is exactly 24 hours, so the number gets bigger when you switch from days to hours.
Days to Hours conversion table
| Days (d) | Hours (h) |
|---|---|
| 1 | 24 |
| 2 | 48 |
| 3 | 72 |
| 5 | 120 |
| 10 | 240 |
| 20 | 480 |
| 50 | 1,200 |
| 100 | 2,400 |
| 500 | 12,000 |
| 1,000 | 24,000 |
The formula
To convert days to hours, multiply the number of days by 24:
hours = days × 24
A worked example
Say you want to convert 3 days into hours:
3 × 24 = 72 hours
That's the kind of figure you'd use to plan a 3-day trip or a project deadline down to the hour.
Why the number is exact
A day is defined as exactly 24 hours — that's not a measurement subject to rounding, it's the definition itself. Every days-to-hours conversion is therefore exact.
When you'll use it
Planning travel itineraries and work shifts, estimating how long a multi-day task will take in hours, and converting deadlines or rental periods that are quoted in days into an hour count.
Frequently asked questions
How many hours are in a day?
Exactly 24 hours. That's simply the standard definition of a day — the time it takes Earth to complete one rotation, divided into 24 equal hours.
Is the days to hours conversion exact?
Yes. A day is defined as exactly 24 hours, so multiplying by 24 is precise — there's no rounding or approximation involved.
How many hours is a half day or a day and a half?
Half a day is 12 hours, and a day and a half is 36 hours — both follow directly from multiplying by 24.