Convert time units — seconds, minutes, hours, days, weeks, months, years.
| Unit | Name | Value |
|---|---|---|
| ms | Millisecond | 3600000 |
| s | Second | 3600 |
| min | Minute | 60 |
| d | Day | 0.041666667 |
| wk | Week | 0.005952381 |
| mo | Month (30d) | 0.0013888889 |
| yr | Year | 0.00011415525 |
Formula: Second = Hour × 3600
Multiply any hour value by 3600 to get second.
Reverse: Hour = Second × 0.0002778
Common hour values — factor: 1 hr = 3600 s
| Hour (hr) | Second (s) | Context |
|---|---|---|
| 1 hr | 3,600 s | One hour |
| 6 hr | 2.16e+04 s | Quarter day |
| 8 hr | 2.88e+04 s | Work day |
| 12 hr | 4.32e+04 s | Half day |
| 24 hr | 8.64e+04 s | One day |
| 48 hr | 1.728e+05 s | Two days |
| 168 hr | 6.048e+05 s | One week |
| 720 hr | 2,592,000 s | One month |
| 8,760 hr | 31,540,000 s | One year |
| 1.752e+04 hr | 63,070,000 s | Two years |
| 8.766e+04 hr | 315,600,000 s | One decade |
| 8.766e+05 hr | 3,156,000,000 s | One century |
| 8,766,000 hr | 31,560,000,000 s | One millennium |
| 87,660,000 hr | 315,600,000,000 s | 10,000 years |
| 876,600,000 hr | 3.156e+12 s | 100,000 years |
Hours × 3,600 = seconds. Exact (60 min/hr × 60 sec/min).
1 hr = 3,600 s, 8 hr = 28,800 s, 24 hr = 86,400 s.
Seconds ÷ 3,600 = hours.
Tracks employee work hours for payroll, overtime, and scheduling.
Estimates task effort and tracks billable hours in hourly units.
Rates labor costs and job duration estimates in hours.
Monitors driving hours for HOS (Hours of Service) compliance regulations.
Measures uptime and SLA compliance in hours per year (e.g. 99.99% = 52.6 min downtime/yr).
Tracks shift lengths, patient observation durations, and IV drip rates in hours.
The hour (3,600 seconds, 60 minutes) has roots in ancient Egyptian astronomy, which divided the day and night into 12 equal parts each. The 24-hour day became standard in ancient Greece and Rome.
Hours define work schedules, travel times, broadcast programming, and billing rates worldwide. UTC (Coordinated Universal Time) is the global reference, and all time zones are defined as offsets of whole or half hours from UTC.
Interesting fact: Earth's rotation is gradually slowing — a day was about 22 hours long 620 million years ago. This is why leap seconds are occasionally needed.
The second is the SI base unit of time, defined since 1967 as exactly 9,192,631,770 cycles of radiation from a caesium-133 atom. Before atomic clocks, the second was defined as 1/86,400 of a mean solar day.
The second is universal in physics, chemistry, and engineering. Speed is measured in meters per second; frequency in cycles per second (Hz); radioactive decay in half-lives counted in seconds.
Interesting fact: Atomic clocks are so precise that they would neither gain nor lose one second over 300 million years. The International Earth Rotation Service occasionally adds 'leap seconds' to keep atomic time aligned with Earth's rotation.
Converting hour to second is a common task across science, engineering, and everyday planning. The time scale spans from nanoseconds in computing to centuries in history, and having accurate conversions helps when comparing measurements across different systems or disciplines.
As a quick reference: 5 hr = 18,000 s and 10 hr = 36,000 s. For the reverse: 1 s = 0.0002778 hr. The exact conversion factor is 1 hr = 3600 s.
All conversions are performed in IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.