How to convert 60 seconds to 1 minute?

60 seconds = 1 minute (exact conversion)

How to convert 24 hours to 1 day?

24 hours = 1 day (exact conversion)

How to convert 7 days to 1 week?

7 days = 1 week (exact conversion)

How to convert 365 days to 1 year?

365 days = 1 year (common year)

How do I convert hours to minutes?

Multiply hours by 60. 1 h = 60 min, 1.5 h = 90 min, 0.5 h = 30 min. The converter above does this instantly.

How many seconds are in a day?

1 day = 24 hours = 1,440 minutes = 86,400 seconds. Exactly, by definition of the second and the day.

Why does "1 month" vary in days?

Calendar months have 28–31 days. Conversion tools often use the average month (~30.44 days). For exact work, use calendar days or specify the month.

How do I convert decimal hours to hours and minutes?

Decimal hours × 60 = minutes. 1.25 h = 1 h 15 min (0.25 × 60 = 15). 2.5 h = 2 h 30 min.

What is the difference between a calendar year and a sidereal year?

Calendar year = 365 or 366 days. Sidereal year (~365.25 days) is one orbit of Earth around the Sun. Many converters use ~365.25 for "1 year" in days.

How accurate is this time converter?

The second is the SI base unit; multiples (min, h, d) are exact. Month and year use standard mean values (e.g. 30.44 days per month). Suitable for planning and payroll.

Time Converter

The second is the same everywhere, but we count in minutes, hours, days, and years. A "month" can be 28 to 31 days; a "year" can be 365 or 366. Payroll uses hours, recipes use minutes, and project timelines use weeks — converting between them avoids double-counting or missed deadlines.

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Quick Reference: Most Searched Time Conversions

1 hour in minutesMost searched

60 min

1 day in hoursExact

24 h

1 week in daysPlanning

7 d

90 minutes in hoursMeetings

1.5 h

1 year in daysCalendar

365.2 d

30 days in hoursBilling

720 h

1 second in msComputing

1,000 ms

1 month in daysApprox

30.44 d

Real-World Time Scale

How these numbers relate to everyday life

0.001s

1 millisecond

Blink of an eye ~100–400 ms. Typical screen refresh 16.7 ms (60 Hz).

One second

SI base unit. Heartbeat ~1 per second at rest.

60s

1 minute

60 s = 1 min. Many short tasks (microwave, parking) are in minutes.

3,600s

1 hour

3,600 s = 1 h. Work shifts, billing, and travel time use hours.

86,400s

1 day

86,400 s = 24 h. Solar day; calendar day can include DST changes.

604,800s

1 week

7 days = 604,800 s. Payroll and project sprints often use weeks.

2,629,746s

1 month (avg)

~30.44 days. Calendar months vary; this is the mean for conversions.

31,556,952s

1 year (sidereal)

~365.25 days. Used in astronomy; calendar year 365 or 366 days.

315,569,520s

1 decade

10 years. Used in climate and demographic data.

Who Uses Time Conversions?

Payroll & Labor

Timesheets are in hours and minutes; contracts may state weekly or monthly hours. Overtime and leave are often in days. Converting ensures correct pay and compliance.

40 h/week = 173.33 h/month (if month = 30.44 days). 8 h/day × 5 days = 40 h.

Project & Sprint Planning

Sprints are 1–4 weeks; milestones in days or months. Gantt charts mix units; wrong conversion shifts deadlines.

2-week sprint = 14 days = 336 h. A "3-month" project ≈ 91 days (not 90 calendar days).

Cooking & Recipes

Recipes use minutes and sometimes hours (e.g. braising). Timers and prep schedules need consistent units.

1 h 30 min = 90 min = 5,400 s. Proofing dough "2 hours" = 120 min.

Broadcasting & Media

Program lengths are in minutes; ad slots in seconds. Schedule grids use hours; runtime totals must match.

90-min film = 1.5 h. 30 s spot × 10 = 300 s = 5 min.

Science & Simulation

Experiments and simulations use seconds or smaller (ms, μs, ns). Converting to hours or days helps reporting and comparison.

86,400 s = 1 day. 1 ns = 1e-9 s. Half-life in years → seconds for decay calculations.

Did You Know?

The second was originally defined as 1/86,400 of a mean solar day. Since 1967 it has been defined by the cesium-133 atom: 9,192,631,770 periods of radiation. So time conversion is exact for SI multiples.

Source: BIPM

A "month" has no fixed length: 28 to 31 days. Conversion tools often use the mean month (30.44 days or 2,629,746 seconds) based on the average length of a calendar year divided by 12.

Source: ISO 8601

Leap years have 366 days; common years 365. So 1 year is sometimes 31,536,000 s (365 × 86,400) and sometimes 31,622,400 s. For long-range conversion, 1 year ≈ 31,556,952 s (sidereal-like mean) is often used.

Source: NIST