A standard 3×12 nursing schedule (three 12-hour shifts per week = 36 hours) typically does not trigger federal overtime. Overtime begins at 40 hours per workweek under FLSA. However, if you pick up an extra shift or your actual shift runs long, overtime can kick in quickly — especially in California where daily overtime starts at 8 hours per day.
Nursing schedules are unlike most jobs. You might work three 12-hour days one week, five days the next, add a float shift, or pick up extra hours during a staffing shortage. This guide walks through exactly how overtime pay is calculated for nurses — with specific examples for 12-hour shifts, California rules, and per diem workers.
Overtime Basics for Nurses
Nurses working in the United States are generally protected by the Fair Labor Standards Act (FLSA), which requires overtime pay for all hours worked beyond 40 per workweek at a minimum rate of 1.5× the regular hourly rate. Most nurses are non-exempt and entitled to overtime.
Key exceptions to be aware of:
- Exempt salaried nurses — Nurse managers or advanced practice nurses earning above $684/week on a salary basis may be classified as exempt (no overtime)
- California nurses — Registered nurses in California are protected from "exempt" classification in most cases, per California court rulings, and receive daily overtime
- Travel nurses — Overtime rules depend on the agency's employment arrangement; stipends are typically excluded from the regular rate calculation
The Standard 3×12 Schedule and Overtime
The most common nursing schedule is three 12-hour shifts per week:
| Schedule | Hours/Week | Federal OT Hours | California Daily OT |
|---|---|---|---|
| 3 × 12-hr shifts | 36 | 0 | 3 × 4 hrs = 12 hrs daily OT |
| 3 × 12 + 1 × 8 extra | 44 | 4 hrs | 3 × 4 + 0 = 12 hrs daily OT |
| 4 × 12-hr shifts | 48 | 8 hrs | 4 × 4 hrs = 16 hrs daily OT |
| 5 × 8-hr shifts | 40 | 0 | 0 (exactly 8 hrs/day) |
California nurses note: If you work a 12-hour shift in California, hours 9–12 are overtime (1.5×) every single shift, even if your weekly total is under 40. This is a significant difference from federal law.
Overtime Pay Formula for Nurses
California overtime (daily 8-hr threshold): Daily OT Pay = (Shift Hours − 8) × Hourly Rate × 1.5 Daily OT (over 12 hrs) = (Shift Hours − 12) × Hourly Rate × 2.0
Example: Federal Overtime — 4×12 Shift Week
RN hourly rate: $38/hr | Schedule: 4 shifts × 12 hrs = 48 hours
Regular hours: 40 × $38 = $1,520
Overtime hours: 8 × $38 × 1.5 = $456
Without OT: 48 × $38 = $1,824 — overtime adds $152 this week.
Example: California Daily Overtime — 3×12 Schedule
RN hourly rate: $42/hr | Schedule: 3 shifts × 12 hrs = 36 hours (under 40)
Regular hours per shift: 8 hrs at $42 = $336
Daily overtime per shift: 4 hrs × $42 × 1.5 = $252
Daily pay per shift: $336 + $252 = $588/shift
Under federal-only rules: 36 × $42 = $1,512 — California daily OT adds $252/week.
Nurse Shift Timesheet Calculator
Enter your actual shift start and end times — ClockCalc automatically calculates daily and weekly overtime. Perfect for tracking float shifts, overtime pickups, and export for your records.
Calculate My Shift Pay →Night Differentials and Weekend Premiums
Many nurses receive shift differentials (extra pay for working nights or weekends). These differentials are added to the base hourly rate for purposes of calculating overtime.
How differentials affect overtime
Under the FLSA, when an employee receives a flat-rate premium (e.g., $3/hr night differential), that premium must generally be included in the "regular rate" used to calculate overtime:
Example: $38 base + $4 night differential = $42 regular rate OT Rate = $42 × 1.5 = $63/hr for overtime hours
Check your contract: Some hospitals use "flat-rate" overtime where the differential isn't included in OT calculations. This is only legal if the differential qualifies for an FLSA exclusion. When in doubt, ask HR for clarification or contact the Department of Labor.
Per Diem and Agency Nurse Overtime
Per diem (PRN) nurses are hourly workers and are entitled to overtime just like staff nurses. Key considerations:
- Overtime is based on hours worked in a workweek, not per facility or per contract
- If you work at two hospitals within the same week (via the same agency), all hours count toward the 40-hour threshold
- If you work independently at two different employers, overtime is calculated separately for each
- Travel nurse stipends (housing, meals, incidentals) are generally excluded from the regular rate — only the hourly taxable wage is used for OT calculations
Frequently Asked Questions
Do nurses get overtime on 12-hour shifts?
Under federal law, nurses earn overtime only after 40 hours per workweek. A 3×12 schedule (36 hrs) doesn't trigger federal overtime. However, in California, hours beyond 8 per day are overtime — so nurses working 12-hour shifts earn 4 hours of daily overtime per shift regardless of the weekly total.
Is mandatory overtime legal for nurses?
Federal law allows mandatory overtime for nurses. However, several states have enacted mandatory overtime restrictions for nurses — including California, New York, Washington, and others. Many states require hospitals to offer voluntary overtime before mandating it. Check your state's nursing workforce laws.
How is overtime calculated for nurses with shift differentials?
Night and weekend differentials are typically included in the regular rate for overtime purposes. If your base rate is $38/hr and you earn a $4/hr night differential, your regular rate is $42/hr and your overtime rate is $63/hr (1.5×).
Do travel nurses get overtime pay?
Yes — the taxable hourly wage portion of a travel nurse's compensation is subject to FLSA overtime rules. Stipends for housing and meals are generally excluded from the overtime calculation base. The agency should calculate OT on the base taxable hourly rate only, not the total package.
What if I work at two hospitals in the same week?
If you're employed by the same staffing agency at both facilities, all hours count toward the weekly overtime threshold. If you are a true dual employee of two separate employers, each employer calculates overtime independently. This is a gray area — when in doubt, consult your agency's payroll department.
Can hospitals make nurses work overtime without consent?
It depends on state law. Mandatory overtime is legal under federal law, but over a dozen states restrict it for nurses. Many hospitals now use incentive pay (1.5×, 2×, or bonuses) to encourage voluntary overtime instead of mandating it.
Conclusion
Nursing overtime pay depends on whether you're subject to federal rules (40-hour weekly threshold) or California's daily overtime protections (8 hours/day). Night differentials increase both your base pay and your overtime rate. Travel nurses earn overtime on taxable hourly wages, not total compensation packages.
Use ClockCalc to enter your exact shift times — it handles break deductions, calculates daily and weekly overtime separately, and lets you export everything to Excel for your records.
Related: IHSS Overtime Calculator (Home Care Workers) · California Overtime Rules · Payroll Time Calculator · Timesheet with Lunch Break