What Is the 40 Hour Work Week Rule According to US Labor Law
The 40-hour workweek is the cornerstone of US wage law. Under the Fair Labor Standards Act (FLSA), 40 hours is the threshold at which overtime pay kicks in for non-exempt employees — every hour beyond 40 in a workweek must be paid at 1.5 times the regular rate.
What the 40-Hour Rule Actually Means
The FLSA does not cap the hours an adult employee can work. Your employer can legally schedule you for 50, 60, or more hours. What the law requires is compensation: once you exceed 40 hours in a workweek, the extra hours cost 1.5× your regular rate. The 40-hour figure is an overtime trigger, not a maximum.
This distinction matters. A worker earning $20/hour who puts in 50 hours earns $800 for the first 40 hours plus $300 for the 10 overtime hours (10 × $30), for a total of $1,100 — not the $1,000 a straight-time calculation would suggest.
Defining a “Workweek”
A workweek under FLSA is a fixed, recurring 168-hour period — seven consecutive 24-hour days. It does not need to match the calendar week (Sunday to Saturday). An employer can define a workweek starting on Wednesday at noon, as long as it stays consistent.
Two critical rules apply. First, employers cannot average hours across multiple workweeks. Working 50 hours one week and 30 the next still earns 10 hours of overtime for the first week — you cannot offset the two. Second, a workweek can be changed permanently and prospectively, but never retroactively to avoid overtime liability.
What Counts Toward the 40 Hours
Hours worked include all time you are required to be on duty, on the employer’s premises, or at a prescribed workplace. This covers:
- Pre-shift preparation and post-shift cleanup
- Mandatory meetings and training
- Short rest breaks of 5 to 20 minutes (paid)
- Travel between job sites during the day
Only bona fide meal breaks of 30 minutes or more, where you are completely relieved of duty, are excluded. A “working lunch” where you remain on call counts as paid working time and pushes you closer to the 40-hour threshold.
Who Is Covered by the 40-Hour Rule
The rule applies to non-exempt employees, which covers most hourly workers and any salaried worker who fails one of the three exemption tests (salary basis, salary level, or duties). The federal salary threshold restored on May 15, 2026 is $684 per week ($35,568 per year) — salaried employees below this floor are non-exempt and entitled to overtime regardless of job title.
State Variations
Several states impose stricter thresholds. California applies daily overtime (1.5× after 8 hours, 2× after 12), meaning a California worker can earn overtime without ever crossing 40 weekly hours. New York’s hospitality industry has a 10-hour daily rule. The federal 40-hour standard is the minimum; state law prevails when it is more generous.
To compute your own weekly pay with overtime built in, use the Work Hours Calculator to total your hours and the Overtime Pay Calculator to apply the 1.5× federal rate.
