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Day to Second Converter

Type a value — the answer appears instantly. 1 d = 86,400 s.

Reviewed by the OmniCalc teamMethod verified 2026-07-01

From unit

To unit
Result

86,400 seconds

= 24 h= 1,440 min

equals 86,400 seconds

Formula: s = d × 86400

Day to Second formula

s = d × 86400

Convert 5 days to seconds

  1. Start with 5 days.
  2. Multiply by the conversion factor: 5 × 86,400 = 432,000.
  3. So 5 d = 432,000 s.

Day to Second conversion table

Day to Second conversion table
Days (d)Seconds (s)
0.01 d864 s
0.1 d8,640 s
0.25 d21,600 s
0.5 d43,200 s
1 d86,400 s
2 d172,800 s
3 d259,200 s
4 d345,600 s
5 d432,000 s
6 d518,400 s
7 d604,800 s
8 d691,200 s
9 d777,600 s
10 d864,000 s
15 d1,296,000 s
20 d1,728,000 s
25 d2,160,000 s
30 d2,592,000 s
40 d3,456,000 s
50 d4,320,000 s
75 d6,480,000 s
100 d8,640,000 s
250 d21,600,000 s
500 d43,200,000 s
1,000 d86,400,000 s
5,000 d432,000,000 s
10,000 d864,000,000 s

Unit definitions

What is a day?

The day is 86,400 seconds, the conventional length of one Earth rotation used for civil timekeeping. It is the basis for calendars, deadlines, and daily life. Seven days make a week.

What is a second?

The second is the SI base unit of time, defined by the hyperfine transition frequency of caesium-133. It is the foundation of all timekeeping and the basis for every other time unit. Sixty seconds make a minute.

Frequently asked questions

How many seconds are in one day?

One day equals 86,400 seconds (1 d = 86,400 s).

How do I convert days to seconds?

Multiply the value in days by 86,400. For example, 10 d × 86,400 = 864,000 s.

Which is bigger — a day or a second?

A day is bigger: one day contains 86,400 seconds.

Is this day to second converter free?

Yes — the converter is free, works offline once loaded, and computes instantly in your browser without sending your numbers to a server.

Conversion factors follow international definitions (SI / NIST). Last verified 2026-07-01.