Time Converter – Convert Seconds, Minutes, Hours, Days Online

Convert between any time unit with our free online time converter. Quickly convert between seconds, minutes, hours, days, weeks, months, and years with precise results.

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Examples:

Understanding Time Units

Time measurement is fundamental to human civilization. We divide time into standardized units: 60 seconds make a minute, 60 minutes make an hour, 24 hours make a day. These divisions come from ancient Babylonian mathematics (base-60) and Earth's rotation. Converting between units helps us understand durations in meaningful ways.

Need to know how many minutes are in 2.5 hours? How many days in 10,000 hours? This converter handles all the multiplication and division so you can focus on planning, scheduling, or solving physics problems.

Time Unit Reference

Unit	Seconds	Minutes	Hours
1 Minute	60	1	0.0167
1 Hour	3,600	60	1
1 Day	86,400	1,440	24
1 Week	604,800	10,080	168
1 Month (avg)	2,629,746	43,829	730.5
1 Year (avg)	31,556,952	525,949	8,766

Worked Examples

Example 1: Seconds to hours

Problem: Convert 7,200 seconds to hours

Solution: 7,200 ÷ 3,600 = 2 hours

There are 3,600 seconds in an hour, so divide by 3,600.

Example 2: Hours to days

Problem: How many days are in 100 hours?

Solution: 100 ÷ 24 = 4.167 days

That's 4 days and 4 hours (0.167 × 24 ≈ 4).

Example 3: Weeks to minutes

Problem: Convert 2 weeks to minutes

Solution: 2 weeks = 14 days = 336 hours = 20,160 minutes

Or: 2 × 7 × 24 × 60 = 20,160 minutes.

Example 4: Years to days

Problem: How many days in 5 years?

Solution: Average year = 365.25 days (accounts for leap years)

5 × 365.25 = 1,826.25 days. About 1,826 days.

Example 5: Mixed conversion

Problem: A movie is 142 minutes long. Express in hours and minutes.

Solution: 142 ÷ 60 = 2.367 hours

2 hours + (0.367 × 60) = 2 hours 22 minutes

The movie runs 2 hours and 22 minutes.

Quick Fact

The 60-second minute and 60-minute hour come from ancient Babylonians who used base-60 (sexagesimal) mathematics around 2000 BCE. This system was convenient because 60 has many divisors (1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60). The 24-hour day comes from ancient Egyptians who divided daylight into 12 hours and nighttime into 12 hours.

Common Time Conversions

Work Hours

8 hours = 480 minutes = 28,800 seconds. A standard workday.

Weeks to Days

1 week = 7 days. 2 weeks = 14 days. 4 weeks = 28 days.

Hours in a Year

1 year = 365.25 days (average) = 8,766 hours = 525,949 minutes.

Movie Runtime

2 hours = 120 minutes. A typical movie length.

Sleep Duration

8 hours = 1/3 of a day. Recommended adult sleep.

Commute Time

30 minutes each way = 5 hours/week = 260 hours/year commuting.

Frequently Asked Questions

Why are months and years approximate?

Months vary from 28-31 days, and years can be 365 or 366 days (leap year). We use averages: 30.44 days per month and 365.25 days per year. For precise calculations, specify exact dates.

How do I convert decimal hours to hours and minutes?

Multiply the decimal part by 60. For example, 2.75 hours = 2 hours + (0.75 × 60) = 2 hours 45 minutes. The whole number stays as hours; convert only the decimal portion.

What's the difference between a sidereal and solar day?

A solar day (24 hours) is based on the Sun's position. A sidereal day (23h 56m) is Earth's actual rotation period relative to distant stars. The 4-minute difference comes from Earth's orbit around the Sun.

Why does a year have 365.25 days?

Earth takes about 365.2422 days to orbit the Sun. We round to 365.25 and add a leap day every 4 years. Century years aren't leap years unless divisible by 400 (so 2000 was a leap year, 2100 won't be).

How many seconds are in a day?

24 hours × 60 minutes × 60 seconds = 86,400 seconds. This is exact for a standard day. Leap seconds are occasionally added to atomic time to keep it synchronized with Earth's rotation.

What's a Julian year?

In astronomy, a Julian year is exactly 365.25 days of 86,400 seconds each = 31,557,600 seconds. It's used for calculating orbital periods and light-years. Different from the calendar year which averages 365.2425 days.

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