Seconds to Days Converter

About the s to d calculation

One second is exactly 0.00001157 days, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The SI base unit of time, defined by the radiation period of the caesium-133 atom. Twenty-four hours, or 86,400 seconds — one full rotation of the Earth relative to the Sun.

Formula

d = s × 0.00001157

1 s = 0.00001157 d
1 d = 86,400 s

Worked example

To convert 3,600 s, multiply by 0.00001157: 3,600 × 0.00001157 = 0.041667 d.

Frequently asked questions

How many days are in a second?

There are 0.00001157 days in one second. To convert any amount, multiply the number of seconds by 0.00001157.

How do I convert days back to seconds?

Divide instead of multiplying, or equivalently multiply by 86,400. One day is 86,400 seconds.

Is this conversion exact?

For seconds through weeks, yes — they are fixed multiples. The year is the mean Gregorian year of 365.2425 days, which is an average rather than the length of any particular calendar year.

Where is each of these units used?

Seconds: the SI base unit of time, defined by the radiation period of the caesium-133 atom. Days: twenty-four hours, or 86,400 seconds — one full rotation of the Earth relative to the Sun.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units