⏱️ TimeToDecimal
Single-Shift Time Card & Decimal Engine

Time Card Calculator with Lunch Break

Deduct unpaid meal breaks, calculate gross-to-net shift duration, handle overnight shifts across midnight, and convert to decimal hours for payroll.

Direct Answer

How Do You Deduct a Lunch Break from Shift Hours?

To deduct an unpaid lunch break from a work shift, calculate total gross elapsed time between Clock In and Clock Out, then subtract the unpaid meal break duration (in decimal hours). If a shift crosses midnight (e.g. 10:00 PM to 6:30 AM), 24 hours is added to the clock-out time before subtraction.

Net Shift Hours = (Clock Out - Clock In) - (Break Minutes ÷ 60)
30-Min Meal Break: 0.50 decimal hours
60-Min Meal Break: 1.00 decimal hour
8:00 AM to 4:30 PM (30m lunch): 8.00 net decimal hours
Gross Earnings: Net Decimal Hours × Hourly Wage Rate

Shift Time & Meal Break Inputs

⚡ Instant Reactive Mode
Overnight Shift Detected: Clock-out is on the following day (+24 hours applied automatically).
8h 30m
Gross Shift Time
30m
Break Deducted
8h 00m
Net Working Time
8.00h
Net Decimal Hours
$200.00
Gross Pay Estimate

Saved Timesheet Log

Shifts saved securely in your local browser cache
Date / Shift Clock In Clock Out Break Rounding Decimal Hrs Gross Pay Action
Total Accumulated: 0.00h $0.00

How to Calculate Time Card Hours with Lunch Breaks

1 Calculate Gross Span

Subtract clock-in from clock-out time. For overnight shifts (e.g. 10 PM to 6 AM), add 24 hours (1,440 minutes) to prevent negative results.

2 Deduct Unpaid Breaks

Subtract bona fide meal break minutes (e.g. 30 or 60 minutes) to determine actual net payable working time.

3 Convert to Decimal Hours

Divide net minutes by 60 (Minutes ÷ 60) to obtain decimal hours (e.g. 45 mins = 0.75 hrs) for payroll software entry.

Related Time & Payroll Calculators:
Multi-Day Timesheet & Overtime Payroll Time Clock Conversion 6-Minute Legal Increment (0.1h) Bulk Decimal to Minutes Tool Decimal Time Conversion Chart Hours & Minutes in Decimals

Frequently Asked Questions

Under the Fair Labor Standards Act (FLSA), bona fide meal periods (typically 30 minutes or more) during which an employee is completely relieved from duty are not counted as hours worked and are unpaid. This tool subtracts your unpaid break duration from your gross shift time before converting to decimal hours.
Under federal regulation 29 CFR § 785.48(b), employers may round employee punch times to the nearest 15-minute increment (.00, .25, .50, .75 hours). The 7/8 rule states:
  • 1 to 7 minutes: Round down to the previous 15-minute mark (.00).
  • 8 to 14 minutes: Round up to the next 15-minute mark (.25).
This rounding must average out fairly over time and cannot solely benefit the employer.
Attorneys, consultants, and auto mechanics often bill in tenths of an hour (6-minute blocks). Each 6-minute interval equals 0.1 decimal hours:
  • 1–6 minutes = 0.1 hr
  • 7–12 minutes = 0.2 hr
  • 13–18 minutes = 0.3 hr
  • ... 55–60 minutes = 1.0 hr
If your Clock Out time is earlier than your Clock In time (e.g., in at 10:00 PM and out at 6:30 AM), the calculator automatically detects a cross-midnight shift and adds 24 hours (1,440 minutes) to prevent negative time calculation errors.