Time conversion

11 units, with s as the base. Every value in the factor table is the number you multiply by, so reading across a row converts out of that unit and reading down a column converts into it.

Factor table

Time conversion factors. Each cell is the value to multiply the row unit by to get the column unit.
from \ to	ns	µs	ms	s	min	h	days	years	thousand yr	million yr	billion yr
ns	1	0.001	1 × 10⁻⁶	1 × 10⁻⁹	1.66667 × 10⁻¹¹	2.77778 × 10⁻¹³	1.15741 × 10⁻¹⁴	3.16881 × 10⁻¹⁷	3.16881 × 10⁻²⁰	3.16881 × 10⁻²³	3.16881 × 10⁻²⁶
µs	1000	1	0.001	1 × 10⁻⁶	1.66667 × 10⁻⁸	2.77778 × 10⁻¹⁰	1.15741 × 10⁻¹¹	3.16881 × 10⁻¹⁴	3.16881 × 10⁻¹⁷	3.16881 × 10⁻²⁰	3.16881 × 10⁻²³
ms	1 × 10⁶	1000	1	0.001	1.66667 × 10⁻⁵	2.77778 × 10⁻⁷	1.15741 × 10⁻⁸	3.16881 × 10⁻¹¹	3.16881 × 10⁻¹⁴	3.16881 × 10⁻¹⁷	3.16881 × 10⁻²⁰
s	1 × 10⁹	1 × 10⁶	1000	1	0.0166667	2.77778 × 10⁻⁴	1.15741 × 10⁻⁵	3.16881 × 10⁻⁸	3.16881 × 10⁻¹¹	3.16881 × 10⁻¹⁴	3.16881 × 10⁻¹⁷
min	6 × 10¹⁰	6 × 10⁷	60,000	60	1	0.0166667	6.94444 × 10⁻⁴	1.90129 × 10⁻⁶	1.90129 × 10⁻⁹	1.90129 × 10⁻¹²	1.90129 × 10⁻¹⁵
h	3.6 × 10¹²	3.6 × 10⁹	3.6 × 10⁶	3600	60	1	0.0416667	1.14077 × 10⁻⁴	1.14077 × 10⁻⁷	1.14077 × 10⁻¹⁰	1.14077 × 10⁻¹³
days	8.64 × 10¹³	8.64 × 10¹⁰	8.64 × 10⁷	86,400	1440	24	1	0.00273785	2.73785 × 10⁻⁶	2.73785 × 10⁻⁹	2.73785 × 10⁻¹²
years	3.15576 × 10¹⁶	3.15576 × 10¹³	3.15576 × 10¹⁰	3.15576 × 10⁷	525,960	8766	365.25	1	0.001	1 × 10⁻⁶	1 × 10⁻⁹
thousand yr	3.15576 × 10¹⁹	3.15576 × 10¹⁶	3.15576 × 10¹³	3.15576 × 10¹⁰	5.2596 × 10⁸	8.766 × 10⁶	365,250	1000	1	0.001	1 × 10⁻⁶
million yr	3.15576 × 10²²	3.15576 × 10¹⁹	3.15576 × 10¹⁶	3.15576 × 10¹³	5.2596 × 10¹¹	8.766 × 10⁹	3.6525 × 10⁸	1 × 10⁶	1000	1	0.001
billion yr	3.15576 × 10²⁵	3.15576 × 10²²	3.15576 × 10¹⁹	3.15576 × 10¹⁶	5.2596 × 10¹⁴	8.766 × 10¹²	3.6525 × 10¹¹	1 × 10⁹	1 × 10⁶	1000	1

Prefixes such as milli, micro and kilo follow the SI prefixes table.

Common conversions

Hours to seconds

1 h = 3600 s. In reverse, 1 s = 2.77778 × 10⁻⁴ h.

Hours to seconds
h	s
1	3600
5	18,000
10	36,000
50	180,000
100	360,000
500	1.8 × 10⁶

Days to hours

1 day = 24 h. In reverse, 1 h = 0.0416667 days.

Days to hours
days	h
1	24
5	120
10	240
50	1200
100	2400
500	12,000

Years to days

1 year = 365.25 days. In reverse, 1 day = 0.00273785 years.

Years to days
years	days
1	365.25
5	1826.25
10	3652.5
50	18,262.5
100	36,525
500	182,625

Worked example

1 h in s
= 1 × 3600
= 3600 s

Convert a number

The table gives the factor; the unit converter does the arithmetic, remembers the units you picked, and turns any conversion into a link you can share.