How do you calculate hours from PM to AM?

You add 12 to PM hours, then calculate the difference. If the shift crosses midnight, add 24 hours to the AM end time.

How does the night shift duration calculator calculator work?

The calculator compares your input with the relevant date, time, calendar, or rate rules, then returns an instant result without manual counting.

Is the night shift duration calculator calculator accurate for 2026?

Yes. The tool uses standard calendar and time logic for 2026, including real month lengths and leap-year behavior where dates are involved.

Can I use this calculator in the US, UK, Australia, or Canada?

Yes. The calculator runs in your browser and uses your local date and time settings, so it is useful for US, UK, AU, Canadian, and other international visitors.

Does this tool include hours and minutes?

Where the calculation needs precision, the result includes smaller time units such as hours and minutes so you can understand the exact answer.

Can I share my result?

Yes. Many pages include a result card or a clear output area that is easy to copy, save, or share with friends, coworkers, or family.

Night Shift Duration Calculator

Calculate the duration of an overnight shift that crosses past midnight. Our calculator handles the AM/PM crossover flawlessly.

Duration Report

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Shift Details

Clock In

Clock Out

Break Minutes

How to Calculate Your Work Hours

Calculating your daily shift duration requires tracking your exact clock-in and clock-out times, and accurately deducting any unpaid breaks. Our calculator automates the math, giving you your precise net work hours instantly.

1. Deducting Unpaid Breaks

Most employers require hourly workers to clock out for lunch or extended rest breaks. For example, if your shift is from 8:00 AM to 5:00 PM (9 hours total), but you take a 30-minute unpaid lunch, your actual paid time is 8 hours and 30 minutes. The calculator automatically subtracts your break minutes from your total shift.

2. Standard vs. Decimal Hours

Payroll systems run on decimal hours, not minutes. You cannot multiply an hourly wage by "8 hours and 30 minutes." You must convert the 30 minutes to a decimal (0.5) to do the math ($20 × 8.5 hours = $170). Our calculator provides both the standard hour/minute format and the exact payroll decimal.

Overnight Shifts & Midnight Crossings

Tracking time gets complicated when a shift starts in the evening and ends the next morning. Manual calculations often result in negative numbers if you don't adjust for the day change.

Our calculator is built with smart overnight detection. If you enter a clock-in time of 10:00 PM and a clock-out time of 6:00 AM, it automatically recognizes that the shift crossed midnight and correctly calculates the 8-hour duration without requiring dates.

Frequently Asked Questions

Subtract 30 minutes from your total shift duration. For example, an 8:00 AM to 4:30 PM shift is 8.5 hours gross. Subtracting 30 minutes leaves exactly 8.0 net work hours.

Under the Fair Labor Standards Act (FLSA) in the US, short breaks (usually 5 to 20 minutes) are compensable work hours. Genuine meal periods (typically 30 minutes or more) where you are completely relieved from duty are not considered paid work time.

Divide your minutes by 60. For example, 15 minutes is 0.25 hours, 30 minutes is 0.50 hours, and 45 minutes is 0.75 hours.

Our calculator uses intelligent 24-hour time wrapping. If your clock-out time is numerically earlier than your clock-in time (e.g., in at 11:00 PM, out at 7:00 AM), it automatically adds 24 hours to the checkout time to compute the correct duration.