What is 8 hours and 30 minutes in decimal?
8 hours and 30 minutes is 8.5 hours, because 30 minutes ÷ 60 = 0.5. To convert any time, divide the minutes by 60 and add it to the whole hours.
Quick reference: 15 min = 0.25, 30 min = 0.50, 45 min = 0.75. So 8:15 = 8.25, 8:30 = 8.5, and 8:45 = 8.75.
Try it: the decimal hours calculator shows every entry in decimal and HH:MM automatically. No sign-up.