How Many Hours in a Work Week?
A standard full-time work week is 40 hours (8 hours × 5 days). Part-time workers typically work 20–34 hours per week, and the ACA classifies 30+ hours per week as full-time for health-coverage purposes.
Weekly Work Hours Calculator
Weekly Hours by Schedule Type
Compare common weekly schedules. The daily averages show how hours break down across a traditional 5-day week versus a compressed 4-day week.
| Hours/Week | Category | Daily avg (5-day) |
|---|---|---|
| 40 | Full-time standard | 8.00 hrs |
| 35 | Reduced full-time | 7.00 hrs |
| 30 | ACA full-time threshold | 6.00 hrs |
| 20 | Half-time / part-time | 4.00 hrs |
The 40-Hour Week, Explained
The 40-hour work week is the US full-time standard — established informally by Henry Ford in 1926 and codified in the Fair Labor Standards Act (1938), which requires non-exempt employees to receive overtime pay for hours worked beyond 40 in a single workweek. Most salaried full-time roles use 40 hrs/wk as the reference, even if actual desk time is lower.
For health-coverage and benefits eligibility, the ACA defines 30+ hours/week (or 130 hrs/month) as full-time. Below that, workers are generally classified as part-time. Compressed schedules — like a 4-day, 10-hour week — still add up to 40 hours total but split differently across the week.
Tracking odd week totals like 37h 45m in a weekly timesheet? Convert to decimal with the inline tool or use the full Hours to Decimal Calculator for payroll-ready precision.
Need the full version? Hours to Decimal Calculator has precision options, seconds, and a copyable output.
Tracking hours across the week? Our Timesheet Tool totals daily in/out times with overtime split — perfect for 40+ hour weeks.
Frequently Asked Questions
How many hours are in a standard work week?
A standard US full-time work week is 40 hours — typically 8 hours per day across 5 days (Monday–Friday). The Fair Labor Standards Act (FLSA) defines the workweek as a fixed, regularly recurring period of 168 hours (seven 24-hour days) for overtime-calculation purposes. Many employees also subtract 30–60 minutes of unpaid lunch per day, bringing actual paid time to ~37.5–40 hours/week.
Is 30 hours a week considered full-time?
Under the Affordable Care Act (ACA), 30 or more hours per week (or 130 hours per month) is classified as full-time for the purposes of employer-sponsored health insurance. Most employers internally define full-time as 35–40 hours/week, and the IRS uses 30+ hours for ACA compliance. Note that these definitions don’t affect overtime eligibility — FLSA overtime still kicks in only after 40 hours.
Is a 40-hour work week legally required in the US?
No. US federal law (FLSA) does not cap weekly hours for most adult workers. What it does require is overtime pay (1.5× regular rate) for non-exempt employees who work more than 40 hours in a single workweek. A handful of states (e.g., California, Alaska, Nevada) also require daily overtime after 8 hours. The 40-hour work week is a long-standing cultural and payroll norm, not a legal mandate.
How many hours per week is part-time?
Most employers define part-time as under 30–35 hours per week, though there is no universal legal definition in the US. The Bureau of Labor Statistics treats 1–34 hours/week as part-time for statistical purposes. Common part-time schedules include 20 hours (half-time), 24 hours (3-day full shifts), and 28 hours (just below the ACA full-time threshold).