Zeptosecond is 1e-21 second units.
Zeptoseconds to Attoseconds Converter — zs to as
Convert Zeptosecond (zs) to Attosecond (as) using the exact conversion factor (1 zeptosecond = 0.001 attosecond). See the formula, worked examples, and conversion table.
Zeptoseconds to Attoseconds converter
Converter
Time Converter
Convert SI time, civil time, historical durations, months, and years.
Context values
Some unit families need one extra value for a physically accurate result.
Attosecond is 1e-18 second units.
Result = input x 1e-21 / 1e-18.
Months and years use the average Gregorian year.
Reserved above the conversion cards and below the converter.
About Converting Zeptoseconds to Attoseconds
Zeptosecond and Attosecond are both everyday units of duration, and converting between them is one of the most routine calculations there is — scheduling, project planning, and billing all depend on it. Specifically: Zeptosecond is 1e-21 second units, and attosecond is 1e-18 second units.
Formula
attoseconds = zeptoseconds × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 zeptosecond equals 1e-21 base units, and 1 attosecond equals 1e-18 base units, so dividing one by the other gives the direct zeptosecond-to-attosecond factor of 0.001.
Simple example
1 zs × 0.001 = 0.001 as
1 zeptosecond = 0.001 attoseconds.
Real-world example
24 zs × 0.001 = 0.024 as
24 zeptoseconds = 0.024 attoseconds.
Conversion table
| Zeptosecond (zs) | Attosecond (as) |
|---|---|
| 1 zs | 0.001 as |
| 7 zs | 0.007 as |
| 24 zs | 0.024 as |
| 30 zs | 0.03 as |
| 100 zs | 0.1 as |
| 365 zs | 0.365 as |
Reverse conversion: Attosecond to Zeptosecond
0.001 as × 1000 = 1 zs
0.001 attoseconds = 1 zeptoseconds.
zeptoseconds = attoseconds × 1000
For a page dedicated to this direction, see Attosecond to Zeptosecond.
Understanding the Zeptosecond (zs)
Zeptosecond is 1e-21 second units.
Understanding the Attosecond (as)
Attosecond is 1e-18 second units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many attoseconds are in 1 zeptosecond?
1 zeptosecond equals 0.001 attoseconds, using the exact defined conversion factor rather than an estimate.
How do I convert zeptosecond to attosecond?
Multiply the zeptosecond value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert attosecond back to zeptosecond?
Use the reverse factor: 1 attosecond equals 1,000 zeptoseconds. You can also use the swap control in the converter above to flip the direction instantly.
What is a zeptosecond?
Zeptosecond (zs) is a unit of time.
What is a attosecond?
Attosecond (as) is a unit of time.
Is the zeptosecond to attosecond conversion exact?
Yes. Both zeptosecond and attosecond are defined by fixed standards rather than physical artifacts, so the factor of 0.001 used above is exact to as many digits as you choose to display.