Work Hours Calculator

How to Calculate Work Hours

Calculating work hours is straightforward once you break it into steps. For each work day:

1. Convert times to 24-hour format. 9:00 AM = 09:00. 5:30 PM = 17:30.
2. Subtract start time from end time. 17:30 − 09:00 = 8 hours 30 minutes (gross hours).
3. Subtract unpaid breaks. 8h 30m − 60 min break = 7h 30m net hours.
4. Convert to decimal hours for payroll: 7h 30m = 7 + (30 ÷ 60) = 7.50 decimal hours.

For a full work week, repeat for each day and add the daily totals. Our calculator above does all of this automatically for all 7 days.

Overnight Shifts

If your shift crosses midnight (e.g., clock in 10:00 PM, clock out 6:30 AM), the calculator detects this automatically. It adds 24 hours to the end time before subtracting: (6:30 + 24:00) − 22:00 = 8h 30m gross hours.

Converting Minutes to Decimal Hours

Payroll systems use decimal hours instead of hours and minutes. The conversion formula is:

Decimal Hours = Whole Hours + (Minutes ÷ 60)

Example: You worked 41 hours and 15 minutes.

• Whole hours = 41
• Minutes to decimal: 15 ÷ 60 = 0.25
• Total decimal hours: 41.25
• At $20/hr: 41.25 × $20 = $825.00

Minutes to Decimal Quick-Reference Table

Tip: 6-minute increments are the standard billing unit in the legal profession (each 6 min = 0.10 hours). Quarter-hour rounding (15 min = 0.25) is the most common payroll rounding method.

FLSA Overtime Rules for US Workers

The Fair Labor Standards Act (FLSA) is the federal law that governs overtime pay in the United States. Here are the key rules every hourly worker and employer should know:

• 40-hour threshold: Non-exempt employees must receive overtime pay for all hours worked over 40 in a workweek.
• Overtime rate: The minimum overtime rate is 1.5× the regular hourly rate (commonly called "time and a half").
• Workweek definition: A workweek is any fixed, recurring 168-hour period (7 consecutive 24-hour periods). It doesn't have to align with the calendar week.
• No daily overtime (federally): Federal law does not require overtime for working more than 8 hours in a single day. However, some states (like California) do require daily overtime after 8 hours.
• Exempt vs. non-exempt: Salaried employees earning above a threshold ($35,568/year as of 2024) in executive, administrative, or professional roles may be exempt from overtime. Hourly workers are almost always non-exempt.

Overtime Calculation Example

You worked 45 hours this week at $20/hour:

• Regular pay: 40 hours × $20 = $800
• Overtime hours: 45 − 40 = 5 hours
• Overtime rate: $20 × 1.5 = $30/hour
• Overtime pay: 5 × $30 = $150
• Total gross pay: $800 + $150 = $950

Our calculator above performs this computation automatically when your total exceeds 40 hours and you enable the "Show Pay Calculation" option.

Common US Work Schedules

How to Calculate Gross Pay from Work Hours

The gross pay formula depends on whether you worked overtime:

No overtime (≤ 40 hours):

Gross Pay = Total Hours × Hourly Rate

With overtime (> 40 hours):

Gross Pay = (40 × Rate) + (Overtime Hours × Rate × 1.5)

Remember: gross pay is before taxes and deductions. Your take-home pay will be lower after federal income tax, state income tax, Social Security (6.2%), and Medicare (1.45%) are withheld. Use our Time Card Calculator for single-day calculations, or our Hours Calculator for multi-day hour tracking.

Federal and State Break Requirements

There is no federal requirement for meal or rest breaks under the FLSA. However, if an employer provides short breaks (typically 5–20 minutes), they must be paid. Meal periods of 30 minutes or longer may be unpaid if the employee is completely relieved of duties.

Many states have their own break laws:

• California: 30-min unpaid meal break for shifts over 5 hours; 10-min paid rest break per 4 hours worked.
• Washington: 30-min meal break for shifts over 5 hours; 10-min paid rest break per 4 hours.
• New York: 30-min meal break for shifts over 6 hours.
• Texas, Florida, Georgia: No state-mandated break requirements (follow FLSA only).

Our calculator defaults to a 60-minute break for weekdays, but you can adjust the break duration for each day to match your actual schedule.

Payroll Time Rounding Rules

The FLSA allows employers to round time to the nearest increment, as long as rounding doesn't systematically favor the employer over time. The most common rounding method is the 7-minute rule:

• Round to the nearest 15 minutes (quarter hour)
• 1–7 minutes → round down
• 8–14 minutes → round up

Example: Clock in at 8:07 AM → rounds to 8:00 AM. Clock in at 8:08 AM → rounds to 8:15 AM.

Some employers use 6-minute rounding (tenth of an hour) or exact-minute tracking with digital time clocks. Always check your company's policy.

Tips for Accurate Time Tracking

• Use consistent time format: Pick either 12-hour or 24-hour and stick with it to avoid AM/PM mix-ups. Our calculator uses 24-hour format for accuracy.
• Record times immediately: Don't rely on memory at the end of the day. Use a phone alarm or digital clock-in system.
• Track breaks separately: Always deduct actual break time, not just the scheduled break. A 45-minute lunch is 0.75 hours, not 1.00.
• Save weekly totals: Keep a record of your weekly hours for pay stub verification and tax documentation.
• Know your state laws: Some states (California, Colorado, Oregon) have daily overtime rules on top of the federal weekly overtime rule.

How Many Work Hours Are in a Year?

The standard figure used for salary-to-hourly conversions in the US is 2,080 hours per year (52 weeks × 40 hours). Use our Business Days Calculator to count the exact working days between any two dates, or our Deadline Calculator to plan project timelines.