Days to Hours Converter
Convert days (d) to hours (h) using documented conversion factors. Includes interactive calculations, conversion formula, worked steps, and common reference tables.
Live Interactive Calculator
hour = day × 24Conversion Formula
To convert from days to hours, apply the mathematical formula:
Where d represents days and h represents hours.
Conversion Factor
The base relationship defined under primary measurement standards:
Reference: BIPM SI Brochure
Time Measurement Standards & Base Units
The SI base unit of time is the second (s), defined by the resonance frequency of the caesium-133 atom.
Larger time intervals follow the historical sexagesimal (base-60) system: 1 minute = 60 seconds, 1 hour = 60 minutes (3,600 seconds), and 1 standard day = 24 hours (86,400 seconds). Conversions between standard time units are exact whole integers.
How to Convert Days to Hours
Converting measurements between days and hours follows a structured calculation process:
- Identify the quantity in days (d) that you wish to convert.
- Multiply the input by the conversion factor ratio
1 d = 24 h. - The resulting value is the equivalent amount expressed in hours (h).
Common Days to Hours Reference Table
Frequently referenced values calculated using documented measurement conversion factors.
| Day (d) | Hour (h) | Arithmetic Expression |
|---|---|---|
| 0.5 d | 12 h | 0.5 × 24 |
| 1 d | 24 h | 1 × 24 |
| 2 d | 48 h | 2 × 24 |
| 3 d | 72 h | 3 × 24 |
| 5 d | 120 h | 5 × 24 |
| 7 d | 168 h | 7 × 24 |
| 10 d | 240 h | 10 × 24 |
| 14 d | 336 h | 14 × 24 |
| 30 d | 720 h | 30 × 24 |
| 365 d | 8,760 h | 365 × 24 |
Worked Calculation Examples
Practical step-by-step calculations showing how to convert days to hours with exact mathematical equations.
Application context: 1 earth solar day is 24 hours
Application context: One calendar week equals 168 hours
Application context: Average calendar month (720 hours)
About the Units
Authoritative technical specifications and historical definitions for both units.
Day (d)
A unit of time equal to 24 hours or 86,400 seconds. Accepted for use with the SI.
Hour (h)
A unit of time equal to 60 minutes or 3,600 seconds (1/24 of a mean solar day).
Related Time Converters
Contextual conversions related to this pair within the measurement graph.