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Example Calculations

1Add 2 Hours 30 Minutes to 9:30 AM

Inputs

Start Time9:30 (9:30 AM)

ModeAdd

Duration2 hours 30 minutes

Result

Result12h 0m (12:00 PM)

Start time = 9 x 60 + 30 = 570 minutes. Duration = 2 x 60 + 30 = 150 minutes. Total = 570 + 150 = 720 minutes. Result hours = floor(720 / 60) = 12, minutes = 720 mod 60 = 0. That is 12:00 PM.

2Time Between 9:00 AM and 5:30 PM

Inputs

Start Time9:00 (9:00 AM)

End Time17:30 (5:30 PM)

ModeBetween

Result

Duration8h 30m

Total Minutes510

Start = 9 x 60 + 0 = 540 minutes. End = 17 x 60 + 30 = 1050 minutes. Difference = abs(1050 - 540) = 510 minutes. Hours = floor(510 / 60) = 8, minutes = 510 mod 60 = 30. Duration is 8 hours and 30 minutes.

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Frequently Asked Questions

How do I calculate time duration between two times?

Subtract start time from end time. 9:00 AM to 5:30 PM = 8 hours 30 minutes. For overnight spans, add 24 hours. This calculator handles the math automatically, including multi-day spans.

Same day: End time - Start time
Overnight: Add 24 hours to end time, then subtract
Multi-day: Include full 24-hour periods
Example: 10:00 PM to 6:00 AM = 8 hours
Example: 9:00 AM to 5:30 PM = 8 hours 30 minutes

Start Time	End Time	Duration	Notes
9:00 AM	5:00 PM	8 hours	Standard workday
9:00 AM	5:30 PM	8 hours 30 min	With 30 min extra
11:00 PM	7:00 AM	8 hours	Overnight shift
6:00 AM	2:30 PM	8 hours 30 min	Early shift

How do I add or subtract time?

Add hours and minutes separately, then combine. 2:45 + 1:30 = 3 hours + 75 minutes = 4 hours 15 minutes. When minutes exceed 60, convert to hours. When subtracting, borrow an hour (60 min) if needed.

Add hours to hours, minutes to minutes
If minutes ≥ 60, subtract 60 and add 1 to hours
Example: 3:45 + 2:30 = 5:75 = 6:15
Subtraction: Borrow 60 min from hours if needed
Example: 5:15 - 2:45 = 4:75 - 2:45 = 2:30

How do I calculate work hours for payroll?

Clock in to clock out time, minus unpaid breaks. 9:00 AM to 5:30 PM with 30 min lunch = 8 hours paid. Keep daily records and add weekly. Overtime typically starts after 40 hours/week or 8 hours/day.

Total hours = Clock out - Clock in - Unpaid breaks
Round to nearest quarter hour (company policy varies)
Track daily, sum for weekly total
Overtime: Usually 1.5× pay after 40 hrs/week
Keep detailed records for disputes

Schedule	Gross Hours	Lunch Break	Paid Hours
9-5 Mon-Fri	8 hrs/day	30 min unpaid	7.5 hrs/day
8-5 Mon-Fri	9 hrs/day	1 hr unpaid	8 hrs/day
9-6 Mon-Fri	9 hrs/day	1 hr unpaid	8 hrs/day

How do I convert time to decimal hours?

Divide minutes by 60. 45 minutes = 45/60 = 0.75 hours. 7 hours 45 min = 7.75 hours. Useful for payroll, billing, and time tracking systems. Round to 2 decimal places.

Formula: Minutes ÷ 60 = Decimal
15 min = 0.25, 30 min = 0.50, 45 min = 0.75
Payroll often uses decimal hours
Billing: Lawyers often bill in 6-min (0.1 hr) increments

Time	Decimal Hours	Common Use
15 minutes	0.25 hours	Quarter hour
30 minutes	0.50 hours	Half hour
45 minutes	0.75 hours	Three-quarter hour
7 hr 30 min	7.50 hours	Full day minus lunch
8 hr 15 min	8.25 hours	Full day plus 15 min

What is the difference between 12-hour and 24-hour time?

12-hour uses AM/PM (1:00 AM to 12:59 PM, 1:00 PM to 12:59 AM). 24-hour uses 00:00-23:59 (military time). Convert PM to 24-hour: Add 12 to hours (3 PM = 15:00). Midnight = 00:00, Noon = 12:00.

AM: Midnight to 11:59 AM (00:00-11:59)
PM: Noon to 11:59 PM (12:00-23:59)
Convert to 24-hour: Add 12 to PM hours
24-hour avoids AM/PM confusion

12-Hour	24-Hour	Notes
12:00 AM	00:00	Midnight
6:00 AM	06:00	Morning
12:00 PM	12:00	Noon
3:00 PM	15:00	Afternoon (12+3)
9:00 PM	21:00	Evening (12+9)
11:59 PM	23:59	Before midnight

How do I handle time zones?

Add or subtract hours based on zone difference. EST is 5 hours behind UTC (GMT). PST is 8 hours behind. 3 PM EST = 12 PM PST = 8 PM UTC. Consider daylight saving time shifts (1 hour difference).

UTC/GMT: Universal reference time
EST: UTC-5, PST: UTC-8, CST: UTC-6
Convert: Add hours going east, subtract going west
Daylight Saving: Most US clocks +1 hour Mar-Nov
Use world clock tools for accuracy

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Last Updated: Jul 24, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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