How many overtime hours are in a 45-hour workweek?

Five overtime hours and 40 regular hours when the weekly threshold is 40. 45 − 40 = 5.

What counts as overtime hours?

Hours actually worked above the threshold that applies to that workweek or, in daily mode, to that shift. Paid time off that is not worked usually does not count toward a federal 40-hour total.

How do I calculate overtime after 40 hours?

Subtract 40 from the hours worked in that single workweek. 43 hours → 3 overtime hours and 40 regular hours.

Does overtime start after 8 hours or 40 hours?

Federal FLSA overtime for covered nonexempt employees is generally after 40 hours in a workweek, not after 8 hours in a day. Some states, including California, add daily rules. Use weekly mode for the federal baseline and daily mode only as a planning model.

Do unpaid lunch breaks count toward overtime?

Unpaid meal periods that are not work time are usually left out of hours worked. Enter those minutes in the break field. Paid breaks stay in the total.

How do I calculate overtime for an overnight shift?

If clock-out is earlier than clock-in, the shift crosses midnight. 10:00 PM to 6:00 AM is 8 hours on the clock. Subtract any unpaid break, then apply the threshold.

How do I convert hours and minutes to decimal hours?

Divide total minutes by 60. 42 hours 30 minutes = 2,550 minutes = 42.5 hours. The weekly hours-and-minutes option does that conversion for you.

Can two workweeks be averaged for federal overtime?

No. The FLSA treats each fixed workweek alone. Thirty hours one week and 50 the next still has 10 overtime hours in the second week.

Does this calculator include overtime pay?

No. It returns regular and overtime hour counts. Use the Overtime Pay Calculator or the Time and a Half Calculator for wage math.

How do I calculate overtime from daily time entries?

Use the 7-day timesheet. Enter clock-in, clock-out, and unpaid break minutes for each day. The tool adds daily nets and applies the weekly threshold once.

Overtime Hours Calculator – Daily & Weekly

Name: Overtime Hours Calculator
Author: EverydayTools

Enter a weekly total, one shift, or a seven-day timesheet. The calculator splits regular hours from overtime hours. It does not calculate overtime pay.

Overtime hours inputs

Results update as you type. Hours stay in this browser. This is an hour split, not a paycheck.

Default 45-hour week is 40 regular hours and 5 overtime hours at a 40-hour threshold. Browser-only math. Hours are not uploaded to EverydayTools.

What Is an Overtime Hours Calculator?

An overtime hours calculator splits time you actually worked into regular hours and overtime hours. Regular hours sit at or below the threshold you choose. Overtime hours are the remainder.

This page counts hours. It does not multiply those hours by a wage. For dollar estimates use the Overtime Pay Calculator or the Time and a Half Calculator.

How to Calculate Overtime Hours

Identify the workweek. Under the federal FLSA it is one fixed 168-hour period—seven consecutive 24-hour days. It may start on any day the employer sets.
Total the hours actually worked in that workweek.
Exclude unpaid meal periods that are not work time. Leave paid breaks in the total.
Apply the threshold that belongs to that mode: 40 hours for a common weekly federal plan, or a custom daily threshold when you are modeling one long shift.
Regular hours = the smaller of net hours and the threshold. Overtime hours = any remainder.

Overtime Hours Formula

Weekly: regular = min(total hours, threshold). overtime = max(0, total hours − threshold). Default threshold is 40.
Daily shift: net hours = (clock-out − clock-in) − unpaid break. If clock-out is earlier than clock-in, add 24 hours first.
Daily overtime (planning): regular = min(net hours, daily threshold). overtime = max(0, net hours − daily threshold).
Hours and minutes to decimal: decimal hours = total minutes ÷ 60. Example: 42 hours 30 minutes = 42.5 hours.

The engine stores time in whole minutes so 42.5 and 2:30 stay exact. Same clock-in and clock-out is 0 hours, not a 24-hour shift.

Overtime Hours Examples

Weekly 40-hour threshold
Hours worked	Regular	Overtime
40.0	40	0
42.5	40	2.50
45.0	40	5
48.0	40	8

9:00 AM to 6:00 PM with a 60-minute unpaid lunch: 8 net hours and 0 overtime hours at an 8-hour daily threshold.
9:00 AM to 7:30 PM with a 30-minute unpaid lunch: 10 net hours and 2 overtime hours at an 8-hour daily threshold.
10:00 PM to 6:00 AM with a 30-minute unpaid break: 7.50 net hours (overnight). At an 8-hour daily threshold that is 0 overtime hours.

Daily vs Weekly Overtime Hours

The U.S. Department of Labor’s FLSA overtime rule for covered nonexempt employees is weekly: hours worked over 40 in one fixed workweek. The Act does not require overtime after 8 hours in a day, and it does not let an employer average 30 hours one week against 50 the next.

Some states add daily rules. California’s Labor Commissioner describes overtime after 8 hours in a workday, double time after 12 hours, and special seventh-day treatment, in addition to weekly overtime after 40 hours. Those hours are not added twice. Where both a daily and a weekly rule could apply, the employee is generally owed the calculation that pays more for the same time—not the sum of both.

This calculator keeps weekly and daily modes separate on purpose. The daily 8-hour setting is a planning example. It is not a claim that federal law uses an 8-hour day, and it is not a complete California overtime engine.

How to Calculate Overtime from a Timesheet

Open the 7-day timesheet mode when you have clock-in, clock-out, and unpaid break minutes for each day. Set the workweek start to match the employer’s fixed week. The tool nets each day, adds those nets, then applies the weekly threshold once.

If you already know the weekly total, stay on weekly mode. You do not need to re-enter every punch. For a fuller shift grid that is not focused on the overtime split, use the Work Hours Calculator.

Overtime Hours With Unpaid Breaks

Overtime thresholds apply to hours worked. An unpaid meal period that is genuine off-duty time is usually left out of that total. A paid rest break stays in. Enter only unpaid minutes in the break field. Whether a particular pause is compensable depends on the job, the state, and whether the employee was free from work—not on this calculator.

Common Overtime Calculation Mistakes

Counting time on site that was not hours worked, or dropping paid breaks from the total.
Forgetting that a shift from 10:00 PM to 6:00 AM crosses midnight.
Assuming every state uses only the federal 40-hour week, or assuming every state uses an 8-hour day.
Treating overtime hours as overtime wages. Hours and pay are separate jobs.
Adding daily overtime hours to weekly overtime hours for the same time.
Averaging two federal workweeks so a short week cancels a long week.

Frequently Asked Questions

How many overtime hours are in a 45-hour workweek?: Five overtime hours and 40 regular hours when the weekly threshold is 40. 45 − 40 = 5.
What counts as overtime hours?: Hours actually worked above the threshold that applies to that workweek or, in daily mode, to that shift. Paid time off that is not worked usually does not count toward a federal 40-hour total.
How do I calculate overtime after 40 hours?: Subtract 40 from the hours worked in that single workweek. 43 hours → 3 overtime hours and 40 regular hours.
Does overtime start after 8 hours or 40 hours?: Federal FLSA overtime for covered nonexempt employees is generally after 40 hours in a workweek, not after 8 hours in a day. Some states, including California, add daily rules. Use weekly mode for the federal baseline and daily mode only as a planning model.
Do unpaid lunch breaks count toward overtime?: Unpaid meal periods that are not work time are usually left out of hours worked. Enter those minutes in the break field. Paid breaks stay in the total.
How do I calculate overtime for an overnight shift?: If clock-out is earlier than clock-in, the shift crosses midnight. 10:00 PM to 6:00 AM is 8 hours on the clock. Subtract any unpaid break, then apply the threshold.
How do I convert hours and minutes to decimal hours?: Divide total minutes by 60. 42 hours 30 minutes = 2,550 minutes = 42.5 hours. The weekly hours-and-minutes option does that conversion for you.
Can two workweeks be averaged for federal overtime?: No. The FLSA treats each fixed workweek alone. Thirty hours one week and 50 the next still has 10 overtime hours in the second week.
Does this calculator include overtime pay?: No. It returns regular and overtime hour counts. Use the Overtime Pay Calculator or the Time and a Half Calculator for wage math.
How do I calculate overtime from daily time entries?: Use the 7-day timesheet. Enter clock-in, clock-out, and unpaid break minutes for each day. The tool adds daily nets and applies the weekly threshold once.

Sources and Limitations

Weekly federal framing follows the U.S. Department of Labor overtime overview: covered nonexempt employees generally receive overtime for hours over 40 in a fixed workweek, and hours are not averaged across weeks. California daily and seventh-day rules are summarized from the California Labor Commissioner overtime FAQ. This page does not implement a combined 50-state overtime engine and does not decide who is exempt.

EverydayTools does not have a named employment-law reviewer for this page. Last editorial review: 2026-10-11. Use the result as an educational hour split, then confirm the rule that applies to the job.

Last editorial review: 2026-10-11. Educational hour split—not a legal determination of overtime pay or eligibility.