Count hours, days, and minutes — in any direction.
Start, end, and an unpaid break. Overnight shifts wrap automatically.
Hours per day × days per week, projected out.
Turn payroll decimals like 7.75 into clock time.
Turn clock time like 7:45 into a payroll decimal.
The work hours calculator answers the everyday questions the other two calculators build on: how long is a single shift, how big is a schedule over a week, a month, or a year, and how do payroll decimals relate to clock minutes. Everything updates live as you type, runs entirely in your browser, and follows the exact formulas below.
Same math the time card uses for each day:
Hours = (End − Start − Break) ÷ 60 If End ≤ Start → add 24:00
9:00 AM to 5:30 PM minus a 30-minute break is exactly 8 hours.
A weekly pattern scaled out over time:
Week = Hours/day × Days Year = Week × 52 Month = Year ÷ 12
The classic 8 × 5 schedule gives 40, 2,080, and about 173 hours.
Payroll systems count in hundredths, clocks in sixtieths:
Minutes = Decimal part × 60 0.25 = 15 min 0.50 = 30 min 0.75 = 45 min 0.10 = 6 min
So 7.75 hours is 7:45 — never 7:75.
Subtract the start time from the end time, subtract any unpaid break, and divide the remaining minutes by 60. The first card above does this live — 9:00 AM to 5:30 PM with a 30-minute break comes to 8.00 hours.
Keep the whole number as hours and multiply the decimal part by 60 for minutes: 7.75 → 7 hours and 0.75 × 60 = 45 minutes. Common shortcuts: 0.25 = 15 min, 0.5 = 30 min, 0.75 = 45 min. The green and orange cards above convert both directions instantly.
Yes. If the end time is earlier on the clock than the start time, the shift is assumed to cross midnight — 10:00 PM to 6:00 AM counts as 8 hours, the same rule the time card calculator and military time converter use.
A standard 40-hour week is 2,080 hours per year (40 × 52), before holidays and vacation. Enter your own hours per day and days per week in the schedule card to see your weekly, monthly, and yearly totals.
Use this page for quick one-off sums and conversions. For a full Monday–Sunday week with per-day breaks, overtime split, and gross pay, use the time card calculator — it saves your entries and exports to CSV.
Results are estimates for general guidance only and are not professional advice. Please double-check anything that affects pay, safety, or spending — see our full disclaimer.