1 hour = 60 min
1 h = 60 min · type math like (12*4)+6.5
Hours to minutes is used for timesheets, payroll, cooking and travel planning. Decimal hours from time-tracking apps, such as 2.75 h, need converting into minutes before they make sense on a clock.
Payroll and invoicing systems often store time in decimal hours, but people read clocks in hours and minutes. Common conversions are 0.25 h = 15 min, 0.5 h = 30 min, 0.75 h = 45 min and 0.1 h = 6 min. Lawyers and consultants often bill in tenths of an hour, so 1.3 h on an invoice means 78 minutes.
Cooking times, especially for slow roasts and braises, are given in hours. A 2.5 hour braise is 150 minutes, and a turkey that needs 4.25 hours roasts for 255 minutes. Setting a kitchen timer in minutes avoids misreading.
Flight schedules and travel times give hours and minutes, but trip planners sometimes show decimal hours. A 9.4 hour flight is 9 h 24 min, or 564 minutes.
Sleep tracking is another use. Eight hours of sleep is 480 minutes, and seven and a half hours is 450 minutes.
Parents and teachers use this for screen time and study plans. Two hours of homework a week is 120 minutes, about 24 minutes per weekday.
Audiobooks are listed in hours and minutes. A 10.5 hour book is 630 minutes, and at 1.5x speed it takes 420 minutes, or 7 hours.
Workplace breaks are often calculated in minutes from hours worked. Some employers give a 15 minute break per 4 hours worked, so an 8 hour shift earns 30 minutes of breaks.
Exam and test lengths are also described both ways. A 2.5 hour exam is 150 minutes, and with 50 questions that allows 3 minutes per question.
Running and cycling events give time limits in hours. A 6 hour marathon cutoff is 360 minutes, which requires an average pace of about 8.5 minutes per kilometer.
To check, the minute figure is always exactly 60 times the hour figure. If you converted 1.2 hours and got 120 minutes, you multiplied by 100 instead of 60; the correct answer is 72 minutes. For mixed values like 3 h 20 min, convert the hours and add the minutes: 200 minutes.
min = h × 60
Reverse: 1 min = 0.016666667 h.
Convert 2.75 hours to minutes.
Answer: 2.75 h = 165 min.
| h | min |
|---|---|
| ¼ h | 15 min |
| ½ h | 30 min |
| ¾ h | 45 min |
| 1 h | 60 min |
| 2 h | 120 min |
| 3 h | 180 min |
| 4 h | 240 min |
| 5 h | 300 min |
| 6 h | 360 min |
| 7 h | 420 min |
| 8 h | 480 min |
| 9 h | 540 min |
| 10 h | 600 min |
| 11 h | 660 min |
| 12 h | 720 min |
| 13 h | 780 min |
| h | min |
|---|---|
| 14 h | 840 min |
| 15 h | 900 min |
| 16 h | 960 min |
| 17 h | 1 020 min |
| 18 h | 1 080 min |
| 19 h | 1 140 min |
| 20 h | 1 200 min |
| 25 h | 1 500 min |
| 30 h | 1 800 min |
| 40 h | 2 400 min |
| 50 h | 3 000 min |
| 75 h | 4 500 min |
| 100 h | 6 000 min |
| 250 h | 15 000 min |
| 500 h | 30 000 min |
| 1 000 h | 60 000 min |
A 7.5 hour flight is 450 minutes.
2.75 billed hours is 165 minutes.
A 3¼ hour roast is 195 minutes.
The decimal is a fraction of an hour. 0.5 h is 30 minutes, so 1.5 h is 1 h 30 min.
Time is base 60. 2.25 hours is 135 minutes, not 225.
Clock changes make some nights 23 or 25 hours. Elapsed time conversion still uses 60 minutes per hour.
An hour is exactly 3,600 seconds, or 60 minutes.
Origin. Ancient Egyptians split day and night into 12 parts each. The fixed 60-minute hour spread with mechanical clocks in 14th century Europe.
Used today. Working time, travel and billing.
A minute is exactly 60 seconds.
Origin. From the Latin pars minuta prima, the first small part, reflecting Babylonian base-60 arithmetic.
Used today. Short durations, schedules and cooking.
75 minutes.
480 minutes.
6 minutes, which is why billing often uses 6-minute units.
Babylonian mathematics was base 60, which divides evenly by 2, 3, 4, 5, 6 and 10.