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Category Salary & HR

Hourly Rate ($)

OT Multiplier

Daily OT Threshold (h)

Weekly OT Threshold (h)

Monday

Start

End

Break (min)

Tuesday

Start

End

Break (min)

Wednesday

Start

End

Break (min)

Thursday

Start

End

Break (min)

Friday

Start

End

Break (min)

Saturday

Start

End

Break (min)

Sunday

Start

End

Break (min)

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About

An 8-hour shift is the standard unit of labor scheduling defined under the Fair Labor Standards Act (FLSA) and most national labor codes. Miscalculating shift duration by even 15 min per day compounds to 65 hours of payroll error per employee per year. This tool computes net work hours by subtracting break time from the gross interval between clock-in t_in and clock-out t_out, handles overnight shifts that cross midnight, and flags overtime beyond the 8h daily or 40h weekly threshold. Pay is derived using configurable hourly rate and overtime multiplier.

The calculator assumes a single continuous shift per day. Split shifts require separate entries. Break deduction is applied as a lump sum, not distributed. Results approximate pre-tax gross compensation and do not account for differential pay, holiday premiums, or jurisdictional rounding rules. Pro tip: many payroll systems round to the nearest 6min increment (tenth of an hour). Compare your employer's rounding method against the raw minutes shown here to detect discrepancies.

Formulas

Gross shift duration in minutes is computed from clock-in and clock-out times, with automatic midnight-crossing detection:

G = (t_out − t_in + 1440) mod 1440

where t_in and t_out are minutes since midnight (0 - 1439), and 1440 = 24 × 60. The modulo operation handles overnight shifts where t_out < t_in.

Net work minutes after break deduction:

N = G − B

where B = break duration in minutes. If N < 0, the result is clamped to 0.

Daily overtime hours beyond the 8h threshold:

OT_daily = max(0, N − 480)

Weekly aggregation sums all daily net values. Weekly overtime applies when total exceeds 40h (2400min):

OT_weekly = max(0, 7∑d=1 N_d − 2400)

Gross pay computation:

Pay = R_reg × R + OT × R × M

where R = hourly rate ($), R_reg = regular (non-OT) hours, OT = overtime hours, and M = overtime multiplier (typically 1.5).

Reference Data

Shift Pattern	Start	End	Gross Hours	Typical Break	Net Hours	Weekly (5d)	OT Weekly
Standard Day	09:00	17:00	8h	30min	7.5h	37.5h	0h
Standard Day (no deduction)	09:00	17:00	8h	0min	8h	40h	0h
Early Morning	06:00	14:00	8h	30min	7.5h	37.5h	0h
Afternoon	14:00	22:00	8h	30min	7.5h	37.5h	0h
Night Shift	22:00	06:00	8h	30min	7.5h	37.5h	0h
Extended Day (10h)	07:00	17:00	10h	60min	9h	45h	5h
12-Hour Shift	06:00	18:00	12h	60min	11h	44h (4d)	4h
12-Hour Night	18:00	06:00	12h	60min	11h	44h (4d)	4h
Short Shift	10:00	14:00	4h	0min	4h	20h	0h
Split Shift A	08:00	12:00	4h	0min	4h	-	-
Split Shift B	16:00	20:00	4h	0min	4h	-	-
Compressed (4×10)	07:00	17:30	10.5h	30min	10h	40h (4d)	0h
FLSA Daily OT Threshold	8h per day (California, Alaska, Nevada, Colorado)						-
FLSA Weekly OT Threshold	40h per workweek (federal standard)						-
Standard OT Multiplier	1.5× (time-and-a-half)						-
Double Time Threshold	12h per day (California) or 2.0×						-
Minimum Break (US Typical)	30min unpaid for shifts ≥ 6h						-
EU Working Time Directive	Max 48h/week averaged over 17 weeks						-
Rest Period (EU)	11h consecutive rest per 24h						-
Payroll Rounding (7-min rule)	Round to nearest 15min; ≤7min rounds down						-

Frequently Asked Questions

The tool adds 1440 minutes (one full day) to the difference between clock-out and clock-in, then takes the modulo 1440. For example, a shift from 22:00 to 06:00 yields (360 − 1320 + 1440) mod 1440 = 480 minutes (8h). This is automatic - no manual date entry required.

Both. Daily overtime flags any single shift exceeding 8h net (after break deduction), following California/Alaska rules. Weekly overtime triggers when the sum of all seven days exceeds 40h, per the federal FLSA standard. Both are shown independently so you can apply whichever your jurisdiction requires.

Break time is subtracted from gross hours. A shift of 09:00 - 17:00 is 8 gross hours, but with a 30min unpaid break the net is 7.5h. If your break is paid, set the break field to 0. Many employees mistakenly assume an 8-hour shift means 8 hours of pay.

This calculator shows exact minutes. Most US employers use the FLSA 7-minute rule: fractional increments of 15 minutes are rounded down if ≤7min and rounded up if ≥8min. Compare the exact minutes here against your pay stub to detect rounding discrepancies. The tool displays both decimal hours and hours:minutes for cross-referencing.

Yes. The overtime multiplier field accepts any value from 1.0 to 3.0. Set it to 1.5 for standard time-and-a-half, or 2.0 for double time. California law mandates 2.0× for hours exceeding 12h in a single day - in that scenario, manually split the entry and apply each multiplier separately.

The modulo formula returns 0 minutes, which is treated as a 0h shift. The tool will not produce an error but will display a toast notification warning that gross hours are zero. A 24h shift is not supported in a single entry because 1440 mod 1440 = 0. For 24-hour shifts, enter two 12-hour blocks.