Sumwise

Seconds to years

years = seconds × 3.168809e-8

Reverse: years to seconds

How to convert seconds to years

One second is 3.168809e-8 years, so multiply the number of seconds by 3.168809e-8. For example, 20 seconds is 20 × 3.168809e-8 = 6.337618e-7 years. To go back, divide by the same number, or multiply by 31,557,600.

Quick estimate

Multiplying by about 3e-8 gets within 5.3% 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.

secondsyears
1 s3.168809e-8 yr
2 s6.337618e-8 yr
3 s9.506426e-8 yr
4 s1.267524e-7 yr
5 s1.584404e-7 yr
6 s1.901285e-7 yr
7 s2.218166e-7 yr
8 s2.535047e-7 yr
9 s2.851928e-7 yr
10 s3.168809e-7 yr
11 s3.48569e-7 yr
12 s3.802571e-7 yr
13 s4.119451e-7 yr
14 s4.436332e-7 yr
15 s4.753213e-7 yr
16 s5.070094e-7 yr
17 s5.386975e-7 yr
18 s5.703856e-7 yr
19 s6.020737e-7 yr
20 s6.337618e-7 yr
25 s7.922022e-7 yr
30 s9.506426e-7 yr
40 s0.00000127 yr
50 s0.00000158 yr
60 s0.0000019 yr
70 s0.00000222 yr
75 s0.00000238 yr
80 s0.00000254 yr
90 s0.00000285 yr
100 s0.00000317 yr
120 s0.0000038 yr
150 s0.00000475 yr
200 s0.00000634 yr
250 s0.00000792 yr
300 s0.00000951 yr
400 s0.00001268 yr
500 s0.00001584 yr
750 s0.00002377 yr
1,000 s0.00003169 yr
1,500 s0.00004753 yr
2,000 s0.00006338 yr
5,000 s0.00015844 yr
10,000 s0.00031688 yr

Questions

How many years are in a second?

3.168809e-8 years.

How do I convert seconds to years in a spreadsheet?

Put the value in A1 and type =A1*3.168809e-8, 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.