Convert Hours to Seconds
1 hour (h) equals 3600 seconds (s).
Converting a list? Use the bulk hour to second converter to paste a column from Excel.
How to Convert Hour to Second
- 1 h = 3600 s
- 1 s = 0.0002777777778 h
- Example: convert 15 h to s: 15 h = 15 × 3600 s = 54000 s
Formula
s = h × 3600
Derivation from SI units:
- 1 h = 60 min = 3600 s
- SI base unit: 9 192 631 770 periods of the caesium-133 hyperfine transition
Both units are defined exactly, so the factor is exact. Hour definition: hour; Second definition: second.
Worked examples
- 1 h equals 3600 s.
1 h × 3600 = 3600 s - An 8 h shift lasts 28800 s.
8 h × 3600 = 28800 s
Hour to Second conversion table
| Hours (h) | Seconds (s) |
|---|---|
| 0.25 h | 900 s |
| 0.5 h | 1800 s |
| 0.75 h | 2700 s |
| 1 h | 3600 s |
| 1.5 h | 5400 s |
| 2 h | 7200 s |
| 2.5 h | 9000 s |
| 3 h | 10800 s |
| 4 h | 14400 s |
| 5 h | 18000 s |
| 6 h | 21600 s |
| 8 h | 28800 s |
| 10 h | 36000 s |
| 12 h | 43200 s |
| 15 h | 54000 s |
| 16 h | 57600 s |
| 18 h | 64800 s |
| 20 h | 72000 s |
| 24 h | 86400 s |
| 36 h | 129600 s |
| 48 h | 172800 s |
| 72 h | 259200 s |
| 100 h | 360000 s |
| 168 h | 604800 s |
| 1000 h | 3600000 s |
| 8760 h | 31536000 s |
Where it's used
Converting hours to seconds turns per-hour quantities (m³/h, kWh) into SI per-second values (m³/s, joules).
Hour to other time units
| Conversion | 1 h equals |
|---|---|
| hour to millisecond | 3600000 ms |
| hour to second | 3600 s |
| hour to minute | 60 min |
| hour to day | 0.04166666667 d |
Frequently asked questions
How many seconds are in 24 hours?
24 h = 86400 s.
How many seconds are in 1 hour?
1 h = 3600 s.
How do I convert hours to seconds?
Multiply the value in h by 3600. For example, 15 h × 3600 = 54000 s.
Is the h to s conversion exact?
Yes. Both units are defined exactly, and 1 h is exactly 3600 s.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8, non-SI units accepted for use with the SI.
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Section 2.3.1, base unit definitions.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Hours to Seconds. Retrieved October 17, 2026, from https://scientificconverters.com/time/hours-to-seconds/
IEEE
Scientific Converters, "Convert Hours to Seconds," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/time/hours-to-seconds/