1 hour and 20 minutes equals 1.33 in decimal format. Calculated by dividing 20 by 60 (= 0.33) and adding it to 1.
Adjust the values below to convert any time to decimal format.
Converting 1 hour and 20 minutes to decimal is a simple three-step process:
Formula: Hours + (Minutes ÷ 60) = 1 + (20 ÷ 60) = 1.33
1 hour and 20 minutes (1.33 decimal hours) is a tricky conversion because it produces a repeating decimal. This duration often comes up for 80-minute class periods at universities, extended doctor appointments, or a standard 1-hour task that ran 20 minutes over.
People often write 1.20 instead of 1.33. Since 20 minutes is one-third of an hour (20 ÷ 60 = 0.333...), the result is a repeating decimal. Most payroll systems round to 2 decimal places: 1.33. Some companies round to the nearest quarter hour, making this 1.25 instead — check your company's rounding policy.
University instructors tracking teaching hours frequently encounter this value, as many institutions use 80-minute class periods. In project management, it's useful to know that 1.33 hours × 3 = approximately 4 hours, making it easier to estimate weekly project time.
1 hour and 20 minutes equals 1.33 decimal hours. You calculate this by dividing 20 by 60 (= 0.33) and adding it to 1.
No! A common mistake is writing 1.20. The correct decimal is 1.33. You must divide minutes by 60, not just append them.
Simply enter 1.33 in the hours column of your timesheet or payroll software. This represents 1 hour and 20 minutes of work.
Most payroll systems use standard rounding: 1.33 (round down). However, some companies round to the nearest quarter (1.25 or 1.50). Check your employer's policy to avoid discrepancies.
Because decimal time divides an hour into 100 parts, not 60. So 20 minutes ÷ 60 minutes = 0.3333, not 0.20. This is the most common source of timesheet errors.
