Zeptosecond is 1e-21 second units.
Zeptoseconds to Yoctoseconds Converter — zs to ys
Convert Zeptosecond (zs) to Yoctosecond (ys) using the exact conversion factor (1 zeptosecond = 1,000 yoctosecond). See the formula, worked examples, and conversion table.
Zeptoseconds to Yoctoseconds 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.
Yoctosecond is 1e-24 second units.
Result = input x 1e-21 / 1e-24.
Months and years use the average Gregorian year.
Reserved above the conversion cards and below the converter.
About Converting Zeptoseconds to Yoctoseconds
Zeptosecond and Yoctosecond 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 yoctosecond is 1e-24 second units.
Formula
yoctoseconds = zeptoseconds × 1000
This factor comes from each unit's defined relationship to the category's base unit: 1 zeptosecond equals 1e-21 base units, and 1 yoctosecond equals 1e-24 base units, so dividing one by the other gives the direct zeptosecond-to-yoctosecond factor of 1000.
Simple example
1 zs × 1000 = 1,000 ys
1 zeptosecond = 1,000 yoctoseconds.
Real-world example
24 zs × 1000 = 24,000 ys
24 zeptoseconds = 24,000 yoctoseconds.
Conversion table
| Zeptosecond (zs) | Yoctosecond (ys) |
|---|---|
| 1 zs | 1,000 ys |
| 7 zs | 7,000 ys |
| 24 zs | 24,000 ys |
| 30 zs | 30,000 ys |
| 100 zs | 100,000 ys |
| 365 zs | 365,000 ys |
Reverse conversion: Yoctosecond to Zeptosecond
1 ys × 0.001 = 0.001 zs
1 yoctosecond = 0.001 zeptoseconds.
zeptoseconds = yoctoseconds × 0.001
For a page dedicated to this direction, see Yoctosecond to Zeptosecond.
Understanding the Zeptosecond (zs)
Zeptosecond is 1e-21 second units.
Understanding the Yoctosecond (ys)
Yoctosecond is 1e-24 second units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many yoctoseconds are in 1 zeptosecond?
1 zeptosecond equals 1,000 yoctoseconds, using the exact defined conversion factor rather than an estimate.
How do I convert zeptosecond to yoctosecond?
Multiply the zeptosecond value by 1000. The converter above does this instantly to whatever precision you set.
How do I convert yoctosecond back to zeptosecond?
Use the reverse factor: 1 yoctosecond equals 0.001 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 yoctosecond?
Yoctosecond (ys) is a unit of time.
Is the zeptosecond to yoctosecond conversion exact?
Yes. Both zeptosecond and yoctosecond are defined by fixed standards rather than physical artifacts, so the factor of 1000 used above is exact to as many digits as you choose to display.