Hours to seconds

seconds = hours × 3,600

How to convert hours to seconds

One hour is 3,600 seconds, so multiply the number of hours by 3,600. For example, 20 hours is 20 × 3,600 = 72,000 seconds. To go back, divide by the same number, or multiply by 0.00027778.

Quick estimate

Multiplying by about 4000 gets within 11.1% of the exact answer, which is enough to check that a result makes sense.

Where it comes up

Time conversions come up in planning and scheduling, timesheets and pay, project estimates and working out ages or durations.

hours	seconds
1 h	3,600 s
2 h	7,200 s
3 h	10,800 s
4 h	14,400 s
5 h	18,000 s
6 h	21,600 s
7 h	25,200 s
8 h	28,800 s
9 h	32,400 s
10 h	36,000 s
11 h	39,600 s
12 h	43,200 s
13 h	46,800 s
14 h	50,400 s
15 h	54,000 s
16 h	57,600 s
17 h	61,200 s
18 h	64,800 s
19 h	68,400 s
20 h	72,000 s
25 h	90,000 s
30 h	108,000 s
40 h	144,000 s
50 h	180,000 s
60 h	216,000 s
70 h	252,000 s
75 h	270,000 s
80 h	288,000 s
90 h	324,000 s
100 h	360,000 s
120 h	432,000 s
150 h	540,000 s
200 h	720,000 s
250 h	900,000 s
300 h	1,080,000 s
400 h	1,440,000 s
500 h	1,800,000 s
750 h	2,700,000 s
1,000 h	3,600,000 s
1,500 h	5,400,000 s
2,000 h	7,200,000 s
5,000 h	18,000,000 s
10,000 h	36,000,000 s

Questions

How many seconds are in a hour?

3,600 seconds.

How do I convert hours to seconds in a spreadsheet?

Put the value in A1 and type =A1*3600, then fill the formula down the column.

Are the values in the table exact?

They are calculated from the exact definitions of the units and rounded only for display. Open any row for the full working.