What is an Hours Calculator
An Hours Calculator is a smart tool that automatically computes the total time between a start time and an end time. Instead of manually adding hours and minutes, it provides accurate results instantly — helping users avoid calculation mistakes and save valuable time.
The calculator is widely used for tracking work hours, employee shifts, billable time for clients, study sessions, overtime, fitness routines, and payroll preparation. It supports both 12-hour (AM/PM) and 24-hour time formats and can display results in hours, minutes, or decimal hours.
Whether for business or personal time management, an Hours Calculator ensures fast, precise, and effortless time tracking.
The Hours Calculator Formula
An Hours Calculator determines the total time by subtracting the start time from the end time. The formula works for both 12-hour (AM/PM) and 24-hour formats.
Basic Formula
Total Hours = End Time − Start TimeStep-by-Step Calculation Method
- Convert start time and end time into 24-hour format (if needed).
- Subtract start hours from end hours.
- Subtract start minutes from end minutes.
- If minutes are negative, borrow 1 hour and add 60 minutes.
Example Calculation
Start time: 09:20 AM
End time: 05:50 PM
Step 1: 05:50 PM → 17:50
Step 2: 17 − 09 = 8 hours
Step 3: 50 − 20 = 30 minutes
Final Answer: 8 hours 30 minutes
Overnight Shift Formula (Crossing Midnight)
Total Hours = (24 − Start Time) + End TimeExample: 10:00 PM to 06:00 AM → (24 − 22) + 6 = 8 hours
Break Deduction Formula (If Break Time Is Entered)
Total Hours = (End Time − Start Time) − Break DurationExample: (8 hours 30 minutes) − (30 minutes break) → 8 hours
So the Hours Calculator instantly applies all these formulas to compute accurate results — including overnight shifts and break deductions — without manual math.
🕒 Hours Calculator — Fast & Accurate Time Tracking Made Easy
Time management is a crucial part of personal and professional life. Whether you're tracking daily working hours, calculating billable time for clients, monitoring employee shifts, or measuring study sessions, accuracy matters. The Hours Calculator instantly computes total time between a start time and an end time, eliminating manual additions and preventing errors — saving effort and giving you reliable results in seconds.
Use it to quickly total hours and minutes for payroll, invoicing, shift planning, or personal productivity tracking. Enter your and times (supporting AM/PM or 24-hour formats) and the tool returns precise totals including fractional hours and minute breakdowns.