How to calculate hours worked
Subtract the start time from the end time and deduct unpaid breaks. From 8:00 to 16:30 with a 30-minute break is 8 hours. For an overnight shift from 22:00 to 6:00 the calculator adds 24 hours to the end time, giving 8 hours.
Hours and minutes vs. decimal hours
Payroll often uses decimal hours. To convert minutes to decimals, divide by 60: 7 hours 45 minutes = 7.75 hours; 20 minutes = 0.33 hours. Mixing the two formats is the most common time card mistake: 7.45 is not 7 hours 45 minutes, it is 7 hours 27 minutes.
Monthly hours
A month does not have exactly four weeks. The average is 52 weeks ÷ 12 = 4.33 weeks, so a 40-hour week equals about 173 hours per month. The calculator uses this average for monthly totals and pay.
Adding up a list of times
In the second tab you can paste a list of durations, one per line, in either format (7:45 or 7.75). The calculator returns the total in hours and minutes and in decimal hours, and flags any lines it cannot read.
Frequently asked questions
How do I calculate hours worked with a lunch break?
How do I convert minutes to decimal hours?
How many working hours are in a month?
How are overnight shifts calculated?
Updated: November 2026 · Supremio Digital, Zagreb
