Minute to Hour

90 minutes equals 1.5 hours (90 ÷ 60 = 1.5). Written as hours and minutes it is 1 hour 30 minutes. Important distinction: 1.5 hours does NOT mean '1 hour and 5 minutes' or '1 hour and 50 minutes' — the decimal 0.5 is a fraction of an hour (0.5 × 60 = 30 minutes). On timesheets and billing software, 90 minutes is always entered as 1.5 h or 1:30.

45 minutes equals 0.75 hours (45 ÷ 60 = 0.75). This is three-quarters of an hour. Billing and payroll systems that use decimal hours record a 45-minute meeting as 0.75 h. Lawyers often bill in 6-minute increments (0.1 h each), so 45 minutes = 7.5 billing units. A standard TV episode of 45 minutes is 0.75 hours on a watch log.

120 minutes equals exactly 2 hours (120 ÷ 60 = 2). A film described as 'two hours' runs for 120 minutes. Common context: a 2-hour exam = 120 minutes of writing time; a 120-minute flight is a short-haul route. The formula is simple: divide minutes by 60 — when the result is a whole number (60, 120, 180…) the conversion is exact.

Divide minutes by 60 to get decimal hours. Key reference: 15 min = 0.25 h, 30 min = 0.50 h, 45 min = 0.75 h, 6 min = 0.10 h (the legal billing unit — lawyers bill in 6-minute or 0.1 h increments). Example: a 50-minute client call = 50 ÷ 60 = 0.833 h, usually rounded to 0.85 or 0.9 h in legal billing. Most payroll software requires decimal hours (e.g., 7:30 worked = 7.5 h, not 7.30 h).