Days to Hours Converter d → h
1 day (d) = 24 hours (h). Type a value below — the conversion happens instantly, entirely on your device.
1 d = 24 h
3 days = 72 hours
3 × 24 = 72
1 d equals 24 h, so multiplying by 24 converts the value. The result describes the exact same quantity — only the measuring stick changes.
How to convert days to hours
hours = days × 24 — multiply the day value by 24.
Example: 3 d = 72 h.
To convert the other way: days = hours ÷ 24 — or use the dedicated h to d converter .
One day is 24 hours, so 3 days is 72 hours — the classic deadline arithmetic ("within 72 hours" = 3 days). A 30-day month is 720 hours.
Days to Hours conversion table
| Days (d) | Hours (h) |
|---|---|
| 0.1 | 2.4 |
| 0.25 | 6 |
| 0.5 | 12 |
| 1 | 24 |
| 2 | 48 |
| 3 | 72 |
| 4 | 96 |
| 5 | 120 |
| 6 | 144 |
| 7 | 168 |
| 8 | 192 |
| 9 | 216 |
| 10 | 240 |
| 15 | 360 |
| 20 | 480 |
| 25 | 600 |
| 30 | 720 |
| 40 | 960 |
| 50 | 1200 |
| 75 | 1800 |
| 100 | 2400 |
| 250 | 6000 |
| 500 | 12,000 |
| 1000 | 24,000 |
About the units
What is a day?
A day (d) is 24 hours or 86,400 seconds — one rotation of the Earth. Calendar calculations and durations build on days.
What is a hour?
An hour (h) is 60 minutes or 3,600 seconds — one 24th of a day. Work time, travel time and billing commonly use hours.
Frequently asked questions
How many hours are in 1 day?
1 day (d) = 24 hours (h).
What is the formula to convert days to hours?
hours = days × 24 — multiply the day value by 24.
How do I convert d to h without a calculator?
Multiply by 24 for a close estimate. Exact factor: 1 d = 24 h.
Is this d-to-h converter accurate and private?
Yes. It uses the exact internationally defined conversion factors and computes results locally in your browser — your input is never sent to a server, and the page keeps working offline.