Femtosecond to Attosecond
Convert Femtosecond to Attosecond instantly. Free online time unit converter with exact formula, conversion table and FAQ.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
Converter
Length Converter
Convert metric, imperial, and nautical distance units.
Context values
Some unit families need one extra value for a physically accurate result.
Use the converter to see the formula.
Results update instantly for Femtosecond to Attosecond conversions.
Reserved above the conversion cards and below the converter.
Formula
attosecond = femtosecond × 1000
femtosecond = attosecond × 0.001
Conversion table
| 1 fs | 1000 as |
| 5 fs | 5000 as |
| 10 fs | 10000 as |
| 20 fs | 20000 as |
| 50 fs | 50000 as |
| 100 fs | 100000 as |
| 500 fs | 500000 as |
| 1000 fs | 1.000000e+06 as |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
What is the source unit in this conversion?
The source unit is the femtosecond (fs). Femtosecond is 1e-15 second units.
What is the destination unit in this conversion?
The destination unit is the attosecond (as). Attosecond is 1e-18 second units.
How do I convert femtosecond to attosecond?
Multiply the femtosecond value by 1000. For example, 10 fs × 1000 = 10000 as.
Is the femtosecond to attosecond conversion exact?
Yes. The relationship between these units is a fixed mathematical or SI-defined ratio, so the conversion factor is exact rather than a measured approximation.
Where is this conversion commonly used?
It's used whenever a value expressed in femtosecond needs to be compared with, or reported in, attosecond, such as in engineering, scientific, or everyday calculations.
Can I convert attosecond back to femtosecond?
Yes. Multiply the attosecond value by 0.001 to get femtosecond.
Reserved between the FAQ and the article so the page stays balanced.
About this conversion
This page converts femtosecond (fs) to attosecond (as) within the time converter.
Femtosecond is 1e-15 second units. Attosecond is 1e-18 second units.
The formula is attosecond = femtosecond × 1000, based on each unit's fixed relationship to the time converter's base unit.
The conversion is exact, since it relies on a fixed numerical ratio between the two units rather than a measured or approximate value.
Use the calculator above for instant results, or the table below for common femtosecond values already converted to attosecond.