How to Calculate Hours Worked (Including Breaks & Overnight)

Tracking your hours is simple subtraction — until overnight shifts, unpaid breaks and overtime get involved. Here's the complete method, from a single shift to a full weekly payroll, with worked examples you can copy.

The basic formula

Hours worked = (clock out − clock in) − break time

Everything else in this guide is just detail around that one line. Get the clock-in and clock-out right, subtract any unpaid break time, and you have the number that matters for your pay.

Worked example — a normal day shift

Clock in at 09:00, out at 17:00, with a 30-minute lunch:

17:00 − 09:00 = 8 hours
8 − 0.5 = 7.5 hours worked

That's 7 hours 30 minutes — or 7.5 in the decimal form most payroll systems use.

Converting minutes to decimal

Payroll rarely deals in "hours and minutes"; it needs a decimal. Divide the minutes by 60:

Worked	Decimal
7 h 30 m	7.5
8 h 15 m	8.25
6 h 45 m	6.75
5 h 20 m	5.33

The formula is decimal hours = hours + (minutes ÷ 60).

Overnight and cross-midnight shifts

If your shift crosses midnight, the clock-out value is smaller than the clock-in. The fix: add 24 hours to the clock-out before subtracting.

In: 23:00, Out: 07:00
07:00 + 24:00 = 31:00
31:00 − 23:00 = 8 hours

Subtract the break as usual: with a 30-minute break, that's 7.5 hours worked. This trips people up constantly because 07:00 minus 23:00 gives a nonsense negative number if you forget the +24.

Shifts that span two or more days

For a shift longer than 24 hours (unusual, but it happens in healthcare and emergency services), break it into calendar days:

• Day 1: 07:00 → 23:59 = 16 h 59 m (just under 17 h)
• Day 2: 00:00 → 19:00 = 19 h
• Total = ~36 h, minus breaks and any meal period in between.

Half-hours, quarter-hours and rounding

Some employers round to the nearest quarter-hour (15 minutes) or use the "7-minute rule": anything up to 7 minutes rounds down, 8+ minutes rounds up. If rounding is applied, calculate the exact time first, then round the decimal — never round each clock-in separately.

Friday-to-Monday weekend example

For payroll, rest the clock:

Day	In	Out	Break (min)	Net
Mon	09:00	17:30	30	8.0
Tue	09:00	17:30	30	8.0
Wed	09:00	17:00	30	7.5
Thu	09:30	17:30	30	7.5
Fri (overnight)	22:00	06:00	0	8.0
Total				39.0

That's 39.0 hours — below 40, so no overtime at a 40-hour threshold, but within 1 hour of it, which matters if this was a short week with a holiday.

Overtime: separate regular from premium hours

If your contract pays overtime (commonly 1.5× above 40 hours a week, or above 8 hours a day), split the totals:

• Regular hours: up to the threshold (e.g. 40/week).
• Overtime hours: everything above it.

Track regular and overtime separately from day one — retroactively reconstructing overtime from clock-in/out logs is error-prone.

Accurate tracking tips

• Record the exact minute of each clock in/out — don't round by hand.
• Subtract only unpaid breaks. Short breaks that are paid (a 10-minute coffee break) usually count as work.
• Sum each day, then sum the week. Watch for holidays and PTO — decide whether they count toward the weekly total (they usually do for overtime purposes) before computing overtime.
• Keep a paper or app trail. If you dispute a paycheck, your own records are your best evidence.

From hours to pay

Once you have your decimal hours, multiply by your hourly rate:

Pay = hours worked × hourly rate

For 39.0 hours at ₹400/hour: 39.0 × 400 = ₹15,600.

Get per-shift totals instantly with the Hours Worked Calculator, then convert to pay with the Hourly Rate Calculator.

Key takeaways

• Hours worked = (clock out − clock in) − breaks.
• Add 24 hours to clock-out for any shift crossing midnight.
• Convert minutes to decimal with minutes ÷ 60.
• Split regular vs overtime hours separately for accurate pay.
• Track exact clock times and keep your own records.