How many days are used for an average Gregorian year?

In scientific and astronomical conversions, 1 Gregorian year is 365.2425 days (31,556,952 seconds), accounting for leap-year rules.

How many milliseconds are in 1 second?

There are 1,000 milliseconds (ms) or 1,000,000 microseconds (µs) in 1 second.

Time Converter

Enter a time duration below to convert between seconds, minutes, hours, days, and years.

Convert Time

Enter a value and select the units to convert between hours, minutes, and seconds.

Instant conversion

Value

From

Result

1,440 min

24 hr = 1,440 min

24 hr = 1,440 min = 86,400 sGet Widget

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Suggested Conversions

Common Time Reference Points

Here are some common time values in Hour (hr), Minute (min), and Second (s). Click any preset value or arrow to load it into the converter.

Description	Hour (hr)	Minute (min)	Second (s)
1 minute (60 seconds)	0.01667	1	60
Half hour (30 minutes)	0.5	30	1,800
1 hour standard duration	1	60	3,600
Standard 8-hour workday	8	480	28,800
1 civil day (24 hours)	24	1,440	86,400
1 calendar week (168 hours)	168	10,080	604,800

Time Conversion Formulas

Use the following formulas to convert between hours, minutes, and seconds.

Hours to Minutes

min = hr × 60

Hours to Seconds

s = hr × 3,600

Days to Hours

hr = d × 24

Example: Convert 24 Hours to Minutes

min = 24 × 60

min = 1,440 min (86,400 seconds)

1 standard civil day equals 24 hours, 1,440 minutes, or 86,400 SI seconds.

Frequently Asked Questions

A 24-hour civil day contains 86,400 seconds (24 hours × 60 minutes × 60 seconds).

Time Converter

Quick Info

Second (s) is the fundamental SI base unit of time defined by the cesium-133 atomic transition frequency.
Minute (min) & Hour (hr) follow the sexagesimal (base-60) division: 1 hr = 60 min = 3,600 s.
Gregorian Year (yr) averages 365.2425 days (31,556,952 seconds) to account for leap-year rules.
Sub-second precision: Computing and physics use milliseconds (10⁻³ s), microseconds (10⁻⁶ s), and nanoseconds (10⁻⁹ s).

Time Units Comparison

Hour (hr)

Standard civil time unit equal to 60 minutes, 3,600 seconds, or 1/24 of a solar day.

Minute (min)

Unit of duration equal to 60 seconds or 1/60 of an hour.

Second (s)

The official SI base unit of time used across physics, engineering, and astronomy.

References

[1]NIST OWM · SI Units — Time
Source
[2]BIPM · SI Base Unit: Second (s)
Source
[3]NIST CUU · Non-SI Units Accepted for Use (min, h, d)
Source

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All Time Conversion Calculators (18)

Select any dedicated time pair below for worked examples and printable tables

Seconds to Minutes (s to min)Seconds to Milliseconds (s to ms)Minutes to Hours (min to hr)Hours to Days (hr to d)Days to Hours (d to hr)Days to Weeks (d to wk)Days to Years (d to yr)Milliseconds to Seconds (ms to s)Hours to Minutes (hr to min)Weeks to Days (wk to d)Months to Years (mo to yr)Years to Months (yr to mo)Seconds to Days (s to d)Days to Seconds (d to s)Minutes to Seconds (min to s)Seconds to Hours (s to hr)Hours to Seconds (hr to s)Minutes to Days (min to d)

Category Conversion Matrix

Simultaneous comparison of 15 units in this category

Second (s)

Millisecond (ms)

1,000

Microsecond (µs)

1,000,000

Nanosecond (ns)

1,000,000,000

Picosecond (ps)

1.000000e+12

Femtosecond (fs)

1.000000e+15

Planck Time (tₚ)

1.854858e+43

Minute (min)

0.01667

Hour (hr)

0.00027777

Day (d)

0.00001157

Week (wk)

0.00000165

Month (Average 30.437 d) (mo)

3.802649e-7

Year (Gregorian 365.2425 d) (yr)

3.168874e-8

Century (century)

3.168874e-10

OTHER

Equal to 1,000 calendar years.

References

NIST · BIPM · ISO

[1]
NIST OWM (SI Units — Time)·Time Metrology Standards — Second (s), Millisecond (ms) & Microsecond (µs)
NIST OWM Standard
[2]
BIPM (SI Base Unit: Second (s))·International Reference Specification for Time & Duration
BIPM Reference
[3]
NIST CUU (Non-SI Units Accepted for Use (min, h, d))·Official Time Conversion Factors & Rounding Rules
NIST CUU Tables

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