Hours to Seconds Converter
Enter the time in hours below to convert it to seconds.
Convert Hours to Seconds
Enter a value in hours (hr) to convert to seconds (s).
Hour to Second Conversion Table
Table showing various hour measurements converted to seconds. Click any preset value or arrow to load it into the converter.
How to Convert Hours to Seconds
To convert hours to seconds, multiply the time by the following conversion ratio: 3,600 seconds/hour.
Since one hour is equal to 3,600 seconds, you can use this simple formula to convert:
The time in seconds is equal to the time in hours multiplied by 3,600.
For example, here's how to convert 2 hours to seconds using the formula above.
How Many Seconds Are in an Hour?
There are 3,600 seconds in an hour, which is why we use this value in the formula above.
Our hour to second calculator automatically converts your time measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Hours and seconds are both units used to measure time. Keep reading to learn more about each unit.
What Is an Hour?
An hour is a unit of time equal to 3,600 seconds (s), the base unit for time. Equal to 60 minutes or 3,600 seconds. [1]
The hour is classified as a standard unit of time. Hours can be abbreviated as hr; for example, 1 hour can be written as 1 hr.
When working with hours (hr) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, hours (hr) are widely used across large-scale industrial, bulk, and macro-level time specifications within international standard workflows, engineering documentation, and technical data sheets.
What Is a Second?
Base SI unit of time. It serves as a primary reference unit for measuring time across scientific and practical applications. [2]
The second is classified as an International System of Units (SI) unit of time. Seconds can be abbreviated as s; for example, 1 second can be written as 1 s.
As the primary coherent reference unit for time in this category, all other time units are mathematically anchored to the second (s).
In practice, seconds (s) are widely used across standard time applications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
When converting time between hours (hr) and seconds (s), keep full floating-point precision (1 hr = 3,600 s; 1 s = 0.000277778 hr) during intermediate calculations and round only the final second figure to match your instrument tolerance.
More Hour & Second Conversions
Need to calculate in the opposite direction? Use our seconds to hours converter (s to hr) to switch your starting unit immediately. You can also explore related tools such as converting milliseconds to seconds, converting days to seconds, or converting hours to days.
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Time)·Time Metrology Standard — Hours (hr) to Seconds (s)
- [2]BIPM SpecificationBIPM (SI Base Unit: Second (s))·Unit Specifications: Hour (hr) & Second (s)
- [3]NIST CUU ReferenceNIST CUU (Non-SI Units Accepted for Use (min, h, d))·Conversion Factors & Mathematical Basis (hr to s)