FLSA Overtime Calculator for Nurses: Regular Rate, Weighted OT, and the 8-and-80 Rule

How FLSA Overtime Works for Nurses

The Fair Labor Standards Act (FLSA) requires employers to pay non-exempt employees - which includes most bedside nurses - at least 1.5 times their "regular rate of pay" for all hours worked over 40 in a workweek.

The critical phrase here is regular rate of pay. This is not the same as your base hourly rate. The regular rate is a calculated figure that includes your base pay plus all non-discretionary compensation earned during that workweek. For nurses, that means shift differentials, weekend premiums, and non-discretionary bonuses all get folded in.

The Regular Rate Formula

The FLSA regular rate is calculated each workweek as follows:

Once you have the regular rate, overtime is paid as an additional 0.5x the regular rate for each overtime hour. (You already received 1x for the straight-time portion of those hours, so the overtime premium is the additional half-time.)

Worked Example: Standard 40-Hour Overtime

Let us work through a realistic week for a nurse who works a mix of shifts.

Step 1: Calculate total straight-time earnings

• Day shift (8 hrs): 8 x $35.00 = $280.00
• Night shifts (24 hrs): 24 x ($35.00 + $5.00) = $960.00
• Weekend night shift (12 hrs): 12 x ($35.00 + $5.00 + $3.00) = $516.00
• Total straight-time earnings: $280.00 + $960.00 + $516.00 = $1,756.00

Step 2: Calculate the regular rate

• Regular rate: $1,756.00 / 44 hours = $39.91/hr

Step 3: Calculate the overtime premium

• OT premium: $39.91 x 0.5 x 4 hours = $79.82

Step 4: Total weekly gross

• Total: $1,756.00 + $79.82 = $1,835.82

Now compare this to what many hospitals incorrectly calculate. If they used only the base rate for overtime: $35.00 x 1.5 x 4 = $210.00, minus the straight-time already paid for those hours ($35.00 x 4 = $140.00), so the OT premium would be $70.00. That is $9.82 less per week than the correct calculation.

The 8-and-80 Exception for Hospitals

The FLSA includes a special overtime provision for hospitals and residential care facilities under Section 207(j), commonly called the "8-and-80" rule.

Under this system, instead of the standard 40-hour workweek, a hospital can use a 14-day work period. Overtime is then owed for:

• Any hours worked over 8 in a single day, OR
• Any hours worked over 80 in the 14-day period

There is no double-counting: hours that already triggered daily overtime are excluded from the 80-hour calculation.

When 8-and-80 Helps vs. Hurts Nurses

The 8-and-80 system can benefit nurses who work a consistent schedule of three 12-hour shifts per week (36 hours). Under standard overtime, they would never hit 40 hours. Under 8-and-80, they would earn daily overtime for 4 hours on each 12-hour shift (the hours over 8).

However, 8-and-80 can also hurt nurses who occasionally work extra shifts. Under the standard rule, working five 12-hour shifts in one week (60 hours) would trigger 20 hours of overtime. Under 8-and-80, the daily overtime applies (4 hours per shift = 20 hours), but the 80-hour threshold for the 14-day period might result in less total OT depending on how shifts fall across the two weeks.

Common Overtime Mistakes Hospitals Make

These are the errors that cost nurses the most money, and they are frustratingly common:

1. Excluding Differentials from the Regular Rate

This is the biggest one. The hospital calculates overtime at 1.5x the base rate instead of 1.5x the regular rate. Night differentials, weekend premiums, and charge nurse pay should all be included in the regular rate calculation. Only truly discretionary bonuses (like a random "thank you" bonus) can be excluded.

2. Using the Wrong Workweek Start Day

Your employer defines when the workweek starts (Sunday at midnight, Monday at 7 AM, etc.). If the payroll system uses a different start time than your actual work schedule, overtime hours can get split across two workweeks and effectively disappear.

3. Misapplying the 8-and-80 Rule

Some hospitals use the 8-and-80 rule incorrectly - applying only the 80-hour threshold without the daily overtime component, or switching between 8-and-80 and standard overtime depending on which costs less.

4. Not Paying Overtime on Mandatory Training or Meetings

If you are required to attend a training session or meeting, those hours count toward your overtime threshold. Many hospitals schedule mandatory education hours that push nurses over 40 but then fail to include those hours in the OT calculation.

5. Rounding Errors That Always Round Down

Federal law allows employers to round clock-in times to the nearest quarter-hour, but the rounding must be neutral over time. If you notice that your hours are consistently rounded down but never up, the rounding practice may violate the FLSA.

How to Check If Your Overtime Was Calculated Correctly

1. Identify your total hours for the workweek (or 14-day period if your facility uses 8-and-80)
2. Calculate your total straight-time earnings including all differentials for that period
3. Divide to get your regular rate - this should be higher than your base rate if you earned any premiums
4. Multiply the regular rate by 0.5 for each overtime hour - this is your overtime premium
5. Compare against what your pay stub shows for overtime pay

If the numbers do not match, you have found a discrepancy worth raising with payroll. See our paycheck verification guide for how to document and escalate the issue.

State Overtime Rules That Override Federal

Some states have overtime rules that exceed the federal minimum:

• California - Daily overtime: 1.5x for hours 8-12, 2x for hours over 12. Plus weekly overtime for hours over 40.
• Alaska - Daily overtime after 8 hours, weekly overtime after 40 hours.
• Nevada - Daily overtime after 8 hours if hourly rate is below 1.5x the state minimum wage.

When state rules exceed federal rules, the employer must follow the state rule. ShiftWorth lets you configure your overtime rules to match your specific facility and state, so every calculation reflects your actual situation.

Let ShiftWorth Handle the Overtime Math

The regular rate calculation changes every week based on your actual mix of shifts, differentials, and hours. Doing it by hand is tedious and error-prone. ShiftWorth tracks all of this automatically.

Enter your shifts during the week, and the app calculates your weighted regular rate, your overtime premium, and your expected gross - including the correct interaction between differentials and overtime. When payday comes, verify your paycheck against what ShiftWorth calculated and see exactly where the numbers differ.