Hours to Femtoseconds Converter
Enter the time in hours below to convert it to femtoseconds.
Convert Hours to Femtoseconds
Enter a value in hours (hr) to convert to femtoseconds (fs).
Hour to Femtosecond Conversion Table
Table showing various hour measurements converted to femtoseconds. Click any preset value or arrow to load it into the converter.
| Hours (hr) | Femtoseconds (fs) |
|---|---|
| 0.0000001 hr | 359,999,999,999.99994 fs |
| 0.0000002 hr | 719,999,999,999.9999 fs |
| 0.0000003 hr | 1.08e+12 fs |
| 0.0000004 hr | 1.44e+12 fs |
| 0.0000005 hr | 1.8e+12 fs |
| 0.0000006 hr | 2.16e+12 fs |
| 0.0000007 hr | 2.52e+12 fs |
| 0.0000008 hr | 2.88e+12 fs |
| 0.0000009 hr | 3.24e+12 fs |
| 0.00000001 hr | 35,999,999,999.99999 fs |
How to Convert Hours to Femtoseconds
To convert hours to femtoseconds, multiply the time by the following conversion ratio: 3.6e+18 femtoseconds/hour.
Since one hour is equal to 3.6e+18 femtoseconds, you can use this simple formula to convert:
The time in femtoseconds is equal to the time in hours multiplied by 3.6e+18.
For example, here's how to convert 5 hours to femtoseconds using the formula above.
How Many Femtoseconds Are in an Hour?
There are 3.6e+18 femtoseconds in an hour, which is why we use this value in the formula above.
Our hour to femtosecond calculator automatically converts your time measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Hours and femtoseconds 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 Femtosecond?
A femtosecond is a unit of time equal to 1e-15 seconds (s), the base unit for time. One-quadrillionth of a second (10⁻¹⁵ s), used in ultrafast laser physics. [2]
The femtosecond is classified as a metric and SI-compatible unit of time. Femtoseconds can be abbreviated as fs; for example, 1 femtosecond can be written as 1 fs.
In the metric system, "femto" is the standard SI prefix for quadrillionths, or 10⁻¹⁵. This makes the femtosecond (fs) a convenient decimal multiple of the second (s).
In practice, femtoseconds (fs) are widely used across fine-tolerance laboratory, analytical, and micro-scale time measurements within SI metric workflows, engineering documentation, and technical data sheets.
When converting time between hours (hr) and femtoseconds (fs), keep full floating-point precision (1 hr = 3.6e+18 fs; 1 fs = 2.777778e-19 hr) during intermediate calculations and round only the final femtosecond figure to match your instrument tolerance.
More Hour & Femtosecond Conversions
Need to calculate in the opposite direction? Use our femtoseconds to hours calculator to switch your starting unit immediately. You can also explore related tools such as converting femtoseconds to hours, converting hours to days, or converting hours to minutes.
Convert from Hours
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Time)·Time Metrology Standard — Hours (hr) to Femtoseconds (fs)
- [2]BIPM SpecificationBIPM (SI Base Unit: Second (s))·Unit Specifications: Hour (hr) & Femtosecond (fs)
- [3]NIST CUU ReferenceNIST CUU (Non-SI Units Accepted for Use (min, h, d))·Conversion Factors & Mathematical Basis (hr to fs)