Days to Seconds converter

To convert days to seconds, enter the value in the first field. The result in seconds is calculated automatically using the exact conversion factor.

1 d = 86400 s
1 s ≈ 0.0000115740740741 d

Formula: s = d × 86400
d ≈ s × 0.0000115740740741

Definitions: 1 d = 24 h

The day (d) here is exactly 86,400 seconds, or 24 hours. The real solar day varies slightly, and some days with leap seconds last 86,401 seconds, but this converter uses the standard 24-hour day.

The second (s) is the SI base unit of time, defined by 9,192,631,770 cycles of the radiation of the cesium-133 atom. All other time units used in science and engineering are built on it.

See the conversion table with commonly used values, handy for quick reference or study.