Femtoseconds: conversions & definition
Femtoseconds (fs) represent time & duration. One unit equals 10^-15 s. The second is the SI base unit of elapsed time. Decimal prefixes change its scale.
Choose the unit you need
Each row converts one fs. Open a converter to enter any value and see its formula, worked example and reference table. Results below are rounded to 10 significant digits.
| Convert to | Equivalent value | Calculator |
|---|---|---|
| Seconds (s) | ≈ 1e-15 | Convert fs to s |
| Milliseconds (ms) | ≈ 1e-12 | Convert fs to ms |
| Kiloseconds (ks) | ≈ 1e-18 | Convert fs to ks |
| Microseconds (µs) | ≈ 1e-9 | Convert fs to µs |
| Megaseconds (Ms) | ≈ 1e-21 | Convert fs to Ms |
| Nanoseconds (ns) | ≈ 0.000001 | Convert fs to ns |
| Gigaseconds (Gs) | ≈ 1e-24 | Convert fs to Gs |
| Centiseconds (cs) | ≈ 1e-13 | Convert fs to cs |
| Deciseconds (ds) | ≈ 1e-14 | Convert fs to ds |
| Hectoseconds (hs) | ≈ 1e-17 | Convert fs to hs |
| Decaseconds (das) | ≈ 1e-16 | Convert fs to das |
| Picoseconds (ps) | ≈ 0.001 | Convert fs to ps |
| Teraseconds (Ts) | ≈ 1e-27 | Convert fs to Ts |
| Petaseconds (Ps) | ≈ 1e-30 | Convert fs to Ps |
| Attoseconds (as) | ≈ 1,000 | Convert fs to as |
| Exaseconds (Es) | ≈ 1e-33 | Convert fs to Es |
| Zeptoseconds (zs) | ≈ 1,000,000 | Convert fs to zs |
| Zettaseconds (Zs) | ≈ 1e-36 | Convert fs to Zs |
| Yoctoseconds (ys) | ≈ 1,000,000,000 | Convert fs to ys |
Keep the quantity consistent
Choose units that represent the same quantity and preserve the measurement conditions. A scale conversion changes the number and unit together; it does not change the physical amount or improve the accuracy of your measurement.
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