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Time Duration Converter

Convert hours to minutes, days to seconds, weeks to hours & 10+ time units instantly. Used by project managers, video editors & fitness enthusiasts. Free, no sign-up.

Last revised 29 September 2026

By Team GlobalCalqulate · About our editorial standards

Time Duration Conversion

Value

Enter the time duration value to convert.

From Unit

Select the unit you want to convert from.

To Unit

Select the unit you want to convert to.

Decimal Places

Number of decimal places for the result (max 15).

Disclaimer: Nanoseconds through fortnights convert by fixed, exact factors (1 day = 86,400 seconds). Month, year, decade, and century use calendar-average lengths (a 365.25-day year, so an average month is 30.44 days) rather than a specific calendar month or year, since actual months range from 28 to 31 days and leap years add a day. For a specific calendar date range, use a date-difference calculator instead. Full disclaimer.

Sources & methodology

Formula:: Two-step conversion through a base unit
Reference:: Bureau International des Poids et Mesures (BIPM)
Content last updated:: September 2026
Scheduled re-verification:: September 2027

Calculation type: Exact calculation. Figures are taken from Bureau International des Poids et Mesures (BIPM) and National Institute of Standards and Technology (NIST) — see sources below.

Formula & methodology

Formula used

Two-step conversion through a base unit

value_out = (value_in × factor_in→the second) ÷ factor_out→the second

Every time unit is defined as a multiple of the second. A conversion goes in to the second and back out again, so one factor per unit covers every possible pair rather than needing a factor for each combination.

Variable definitions

Symbol	Meaning	Unit
factor	Conversion factor. how many seconds one unit represents	s

Step-by-step calculation

1. Choose the unit you have
The value is converted to seconds first.
2. Choose the unit you want
Seconds are converted out to the target unit.

Limitations

Months and years are not fixed durations. A month here is treated as an average rather than a calendar month, so results for long spans are approximations — use a date calculator when exact calendar dates matter.
Leap years and leap seconds are not modelled. A "year" is an average length, not a specific calendar year.
Seconds, minutes, hours, days and weeks convert exactly.

This page is educational. It converts between units using the defined or standard factors shown above, so the arithmetic is exact to the precision displayed — but a converted value is only as good as the measurement behind it, and some units are defined only under stated conditions. Where a conversion is safety-critical or contractual, check it against the governing standard rather than relying on this page.

Sources & references

The International System of Units (SI Brochure, 9th edition) — the second defined by the caesium-133 hyperfine transition frequency (9 192 631 770 Hz) — Bureau International des Poids et Mesures (BIPM)
NIST Special Publication 811: Guide for the Use of the International System of Units — National Institute of Standards and Technology (NIST)

Units from nanoseconds through fortnights are exact multiples of the SI second, so results there are limited only by the display rounding you choose. Month, year, decade and century necessarily use the Julian year (365.25 days, giving a 30.44-day average month) because no single exact value exists for a calendar month or year — this converter states that choice rather than leaving it implicit. Standards review: September 2026.

Help & FAQs

Frequently Asked Questions

Clear answers to common questions to help you use this calculator confidently.

How do you convert hours to minutes?

Tap to view the answer

Formula: hours × 60 = minutes. Example: 2.5 hours × 60 = 150 minutes, which is the runtime of a typical feature film. To go the other way, divide minutes by 60.

How many hours are in a day?

Tap to view the answer

1 day = 24 hours = 1,440 minutes = 86,400 seconds. To convert days to hours, multiply by 24: 7 days × 24 = 168 hours (1 week).

What is 1 month in days?

Tap to view the answer

This converter uses an average month of 30.44 days (365.25 days ÷ 12), since actual calendar months range from 28 to 31 days. For a specific month's exact length, check a calendar rather than this average.

How accurate is this time duration converter?

Tap to view the answer

Seconds through fortnights convert by exact, fixed factors (1 day = exactly 86,400 seconds). Month, year, decade, and century use calendar averages, so they won't match a specific calendar month or year exactly — use a date-difference calculator if you need an exact span between two real dates.

What is the difference between a time duration converter and a time zone converter?

Tap to view the answer

A time duration converter changes the unit of a length of time (hours to minutes). A time zone converter changes the same moment in time between two different locations (New York time to London time). They solve different problems.

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How to Use This Calculator

Enter Time Duration

Type the numeric duration you want to convert, such as a work shift length or video runtime.

Select Source Unit

Choose the unit of your input (e.g., hours for a shift, minutes for a video, days for a project timeline).

Select Target Unit

Choose the unit you want to convert to (e.g., minutes, weeks, or years).

View Results

See the converted value, formula, and real‑world context.

Common time-duration conversions
From	To	Conversion
1 min	60 s	60
1 h	60 min	60
1 h	3,600 s	3,600
1 day	24 h	24
1 day	86,400 s	86,400
1 week	7 days	7
1 year	365.25 days	365.25
1 s	1,000 ms	1,000
1 ms	1,000 µs	1,000
1 fortnight	14 days	14

From

Conversion

1 min

60 s

1 h

60 min

1 h

3,600 s

3,600

1 day

24 h

1 day

86,400 s

86,400

1 week

7 days

1 year

365.25 days

365.25

1 s

1,000 ms

1,000

1 ms

1,000 µs

1,000

1 fortnight

14 days

Understanding Your Results

Second (s)
The SI base unit of time. Defined as the duration of 9,192,631,770 periods of radiation of cesium-133.
Minute (min)
60 seconds. A common unit for everyday time measurement.
Hour (h)
60 minutes or 3,600 seconds. Used for time of day and duration.
Day
24 hours or 86,400 seconds. The time for one rotation of Earth.
Week
7 days. A common scheduling and planning unit.
Month (average)
30.44 days (average over a year). Used for billing and calendar planning.

Understanding Time Units

What is Time?

Time measures the duration between events. The SI second has been defined since 1967 by a fixed count of caesium-133 atomic oscillations, not by celestial motion — which is why leap seconds are occasionally added to keep clocks aligned with Earth's slightly irregular rotation.

Common Time Units

Seconds, minutes, hours, days, weeks, months, and years are the most common units for measuring time.

Months and Years Are Averages Here

Calendar months range from 28 to 31 days and years vary with leap days, so this converter uses fixed averages for month, year, decade, and century: a 365.25-day year and a 30.44-day average month. This makes unit math consistent, but it isn't the same as counting days between two specific calendar dates — use a date-difference calculator for that.

Formula & methodology

Formula used

Two-step conversion through a base unit

value_out = (value_in × factor_in→the second) ÷ factor_out→the second

Variable definitions

Symbol	Meaning	Unit
factor	Conversion factor. how many seconds one unit represents	s

Step-by-step calculation

1. Choose the unit you have
The value is converted to seconds first.
2. Choose the unit you want
Seconds are converted out to the target unit.

Limitations

Months and years are not fixed durations. A month here is treated as an average rather than a calendar month, so results for long spans are approximations — use a date calculator when exact calendar dates matter.
Leap years and leap seconds are not modelled. A "year" is an average length, not a specific calendar year.
Seconds, minutes, hours, days and weeks convert exactly.

Sources & references

Calculator inputs

Time Duration Conversion

Your results

Sources & methodology

Formula & methodology

Formula used

Two-step conversion through a base unit

Variable definitions

Step-by-step calculation

Limitations

Sources & references

How do you convert hours to minutes?

How many hours are in a day?

What is 1 month in days?

How accurate is this time duration converter?

What is the difference between a time duration converter and a time zone converter?

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Calculator inputs

Time Duration Conversion

Your results

Sources & methodology

How to Use This Calculator

Example: Convert 2.5 Hours to Minutes

Common Time Conversions

Understanding Your Results

Key Tips

Understanding Time Units

What is Time?

Common Time Units

Months and Years Are Averages Here

Formula & methodology

Formula used

Two-step conversion through a base unit

Variable definitions

Step-by-step calculation

Limitations

Sources & references

How to Use This Calculator

Example: Convert 2.5 Hours to Minutes

Common Time Conversions

Understanding Your Results

Key Tips

Understanding Time Units

What is Time?

Common Time Units

Months and Years Are Averages Here