Table Of Contents
Femtosecond to seconds Conversion
1 femtosecond (fsec) is equal to 0.000000000000001 seconds (sec).
1 fsec = 0.000000000000001 sec
or
1 sec = 1000000000000000 fsec
Formula
To convert a time from femtosecond (fsec) to seconds (sec), divide the time in femtosecond by 1000000000000000
t(sec) = t(fsec) / 1000000000000000
Frequently asked questions
How do I convert femtosecond to seconds?
Divide the value in femtosecond by 1000000000000000 to get the result in seconds. For example, 5 fsec ÷ 1000000000000000 = 0 sec.
How many seconds are in 1 femtosecond?
1 femtosecond (fsec) is equal to 0 seconds (sec).
How do I convert seconds back to femtosecond?
Use the inverse operation: multiply the value in seconds by 1000000000000000 to get the result in femtosecond.
How accurate is the femtosecond to seconds conversion?
The converter multiplies by the conversion factor 1000000000000000 and rounds the result to 9 decimal places by default. You can increase or reduce the precision with the digits option on this page.
Sources
Conversion factors are based on internationally recognised standards:
- BIPM — The International System of Units (SI Brochure, 9th edition)
- The Unified Code for Units of Measure (UCUM), Version 2.2 (2024-06-17)
- ISO 80000-3:2019 — Quantities and units — Part 3: Space and time
- NIST Guide to the SI (SP 811), Chapter 6: Rules and Style Conventions for Printing and Using Units
- CLDR Unit Conversions chart (supplemental data, latest release) - convertibility classes and conversion factors only
