Time Converter

Convert between different time units including seconds, minutes, hours, days, weeks, months, years, and sub-second units (ms, μs, ns).

All conversions happen locally in your browser. No data is sent to servers or stored remotely.
Precision: 4Format: Decimal
Round (decimal places):
Number format:
60

1 h = 60 min

⏱️Quick Conversions

📅Common Time Periods

Minute
60 seconds = 1/60 hour
Hour
60 minutes = 3600 seconds
Day
24 hours = 1440 minutes = 86,400 s
Week
7 days = 168 hours = 604,800 s
Year (Common)
365 days = 8760 hours = 31.536 Ms
Decade
10 years ≈ 3652.5 days

⚙️Time Unit Systems

Standard Units
Second, minute, hour, day, week, month, year
Sub-Second
Millisecond (ms), microsecond (μs), nanosecond (ns)
Long Periods
Decade, century, millennium
Astronomical
Sidereal year/day, tropical year, Julian year

💡Tips

• 1 year ≈ 365.25 days (accounting for leap years)

• Sidereal day (23h 56m 4s) ≠ solar day (24h)

• 1 ms = 0.001 s; 1 μs = 0.000001 s; 1 ns = 0.000000001 s

• Tropical year (365.242 days) used in calendar systems

📊Conversion Table

Convert 1 h to:

Metric System

Second (s)
3,600
Minute (min)
60
Day (d)
0.0417
Year (365 days) (yr)
0.0001
Week (wk)
0.006
Millisecond (ms)
3.6000e+6
Month (30 days) (mo)
0.0014
Microsecond (µs)
3.6000e+9
Nanosecond (ns)
3.6000e+12
Century (c)
1.1416e-6
Leap Year (366 days) (ly)
0.0001
Decade (dec)
1.1416e-5
Picosecond (ps)
3.6000e+15
Millennium (mil)
1.1416e-7
Femtosecond (fs)
3.6000e+18

Traditional

Fortnight (fn)
0.003
Shake (shake)
3.6000e+11

Scientific

Sidereal Day (sd)
0.0418
Tropical Year (ty)
0.0001
Sidereal Year (sy)
0.0001
Planck Time (tₚ)
6.6775e+46
METRIC SYSTEM(15 units)
Second (s)
3,600
Minute (min)
60
Day (d)
0.0417
Year (365 days) (yr)
0.0001
Week (wk)
0.006
Millisecond (ms)
3.6000e+6
Month (30 days) (mo)
0.0014
Microsecond (µs)
3.6000e+9
Nanosecond (ns)
3.6000e+12
Century (c)
1.1416e-6
Leap Year (366 days) (ly)
0.0001
Decade (dec)
1.1416e-5
Picosecond (ps)
3.6000e+15
Millennium (mil)
1.1416e-7
Femtosecond (fs)
3.6000e+18
TRADITIONAL(2 units)
Fortnight (fn)
0.003
Shake (shake)
3.6000e+11
SCIENTIFIC(4 units)
Sidereal Day (sd)
0.0418
Tropical Year (ty)
0.0001
Sidereal Year (sy)
0.0001
Planck Time (tₚ)
6.6775e+46

What is a Time Converter?

The Time Converter helps you convert between seconds, minutes, hours, days, years, and 22+ other time units including sub-second (milliseconds, nanoseconds) and astronomical units. Perfect for scheduling, physics, programming, and astronomy.

Key Features:

  • 22+ Units: Seconds to millennium, milliseconds to femtoseconds, astronomical units
  • Sub-Second Precision: ms, μs, ns for computing and electronics
  • Long Periods: Decade, century, millennium
  • Quick Conversions: Common time periods instantly
  • Privacy Friendly: All calculations in your browser

Perfect For: Programmers, scientists, astronomers, project managers.

Frequently Asked Questions

How many seconds are in a day?

One day contains exactly 86,400 seconds (60 seconds × 60 minutes × 24 hours = 86,400). This is a standard conversion used in computing, physics, and everyday time calculations.

What's the difference between a year and a Julian year?

A common year has 365 days (365.25 days accounting for leap years), while a Julian year is exactly 365.25 days (31,557,600 seconds). Julian years are used in astronomy for consistent calculations.

How many milliseconds are in a second?

One second equals exactly 1,000 milliseconds (ms). Similarly: 1 second = 1,000,000 microseconds (μs) = 1,000,000,000 nanoseconds (ns). These sub-second units are crucial in computing and electronics.

Why are there 60 seconds in a minute?

The base-60 (sexagesimal) system for time comes from ancient Babylonian mathematics. They chose 60 because it's highly divisible (by 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60), making fractions easier to calculate.

What's a fortnight and how long is it?

A fortnight is 14 days (2 weeks), or 336 hours, or 20,160 minutes. The term comes from Old English "fēowertīene niht" (fourteen nights) and is still commonly used in British English and Australia.