Day to Hour Converter
Converts day to hour (d to hr) and back. The conversion factor is shown below every result.
How to Convert Day to Hour
What Is a Day?
The day (d) is a unit of time accepted for use with SI, equal to exactly 24 hours for calendar and everyday purposes.
What Is a Hour?
An hour (hr), accepted for use alongside SI units, equals exactly 60 minutes.
Common Day to Hour Reference Points
Real-world reference values for quick sanity checks.
| Item | Day (d) | Hour (approx.) |
|---|---|---|
| A standard workweek span | 5 d | 120 hr |
| Two weeks | 14 d | 336 hr |
| Reference values are illustrative approximations for common items, not measured specifications. | ||
Day to Hour Conversion Table
| Day (d) | Hour (hr) |
|---|---|
| 0.5 d | 12 hr |
| 1 d | 24 hr |
| 2 d | 48 hr |
| 3 d | 72 hr |
| 5 d | 120 hr |
| 7 d | 168 hr |
| 14 d | 336 hr |
| 30 d | 720 hr |
| Source: BIPM SI Brochure, 9th ed. (1 day = 24 hours exactly, for calendar purposes) | |
Frequently Asked Questions
How do I convert days to hours?
Multiply the day value by 24. For example, 3 d × 24 = 72 hr.
Is every day exactly 24 hours?
For calendar and everyday conversion purposes, yes, and that's the definition used here. The Earth's actual rotation period varies by fractions of a second over time, which matters for precision timekeeping (leap seconds) but not for everyday date and duration math.
How do I convert days directly to minutes or seconds?
Multiply by 24 for hours first, then by 60 for minutes, then by 60 again for seconds, or multiply straight through by 1,440 (minutes) or 86,400 (seconds) in one step.
Related Time Converters
A good measuring tool marked in both d and hr removes the guesswork at the point of use.