1 Hour equals 3,600 Seconds.
| Hour (hr) | Second (s) |
|---|---|
| 0.001 hr | 3.6 s |
| 0.01 hr | 36 s |
| 0.1 hr | 360 s |
| 1 hr | 3,600 s |
| 2 hr | 7,200 s |
| 5 hr | 18,000 s |
| 10 hr | 36,000 s |
| 25 hr | 90,000 s |
| 50 hr | 180,000 s |
| 100 hr | 360,000 s |
| 500 hr | 1,800,000 s |
| 1,000 hr | 3,600,000 s |
To convert Hours to Seconds, multiply the value by 3,600. This factor comes from the ratio of the two units' definitions: one Hour equals 3,600 Seconds.
For example: 1 Hour = 3,600 Seconds, and 10 Hours = 36,000 Seconds.
To convert in the reverse direction — from Seconds to Hours — multiply by 0.000277778.
The hour is a unit of time equal to 60 minutes or 3,600 seconds, and its origin lies in the ancient division of the day into 24 equal parts. This 24-hour day was established by Egyptian and Babylonian astronomers, who divided daylight into 12 hours and nighttime into 12 hours. Because the duration of daylight and darkness varies seasonally, these early hours varied in length through the year; only with the invention of mechanical clocks in medieval Europe did equal-length hours become universal.
The 24-hour day is so deeply ingrained in human culture and technology that it has survived every attempt at decimal time reform — most notably France's Revolutionary decimal time (1793–1805), which divided the day into 10 hours of 100 minutes each. The hour structures our social coordination: work schedules, transportation timetables, broadcast schedules, and medical treatment intervals are all organized in hours. The expression "man-hour" or "person-hour" as a unit of labor remains fundamental in project management.
Hourly data is the standard resolution for meteorology, power grid monitoring, internet traffic analysis, and many other continuous measurement systems. The abbreviation "h" is preferred in SI notation (1 h = 3,600 s), and the hour appears in many derived units: km/h for speed, kWh for energy (the amount of energy delivered by one kilowatt in one hour), and mg/h for drug infusion rates. One interesting fact: 24 hours is a convention — a "sidereal day" (one full Earth rotation relative to distant stars) is actually about 23 hours and 56 minutes.
The second is the SI base unit of time, and since 1967 it has been defined as exactly 9,192,631,770 oscillations of the radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom. This extraordinarily precise definition — based on a quantum-mechanical property of a specific atom — allows atomic clocks to measure time with an accuracy better than one second in 300 million years.
The second originated in the Babylonian system of dividing the day into 24 hours, each hour into 60 minutes, and each minute into 60 seconds — a sexagesimal (base-60) system that dates to around 2000 BCE and was inherited by ancient Greek astronomy. The word "second" comes from the Latin "pars minuta secunda" (second small part), meaning the second application of the sexagesimal division. This historical origin explains why we still divide hours into 60 minutes and minutes into 60 seconds rather than a more decimal-friendly 100.
The second is the fundamental unit for frequency (Hz = cycles per second), for speed in conjunction with the meter, and for almost every time-dependent physical quantity. The realization of the second is so important that GPS satellites carry atomic clocks accurate to nanoseconds, and the international time scale UTC (Coordinated Universal Time) is maintained by averaging over 450 atomic clocks at labs in 80 countries. Occasionally a "leap second" is added to UTC to keep atomic time aligned with Earth's slightly irregular rotation.
1 Hour equals 3,600 Seconds.
To convert Hours to Seconds, multiply by 3,600. For example, 0.1 Hours = 360 Seconds.
1 Second equals 0.000277778 Hours.