CortexCalculator
CortexCalculator
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Time Calculator – Add, Subtract & Track Work Hours

Calculate time durations, add or subtract time periods, track work hours, and convert to decimal hours for payroll processing. Supports multiple entries and various time formats.

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Disclaimer

This calculator provides estimates for informational purposes only. Results may vary based on individual circumstances. Consult a qualified financial professional or tax advisor for personalized advice. Tax rates and brackets are based on 2026 data and are subject to change.

Why Standard Math Does Not Work for Time Calculations

You cannot add time the same way you add regular numbers. Time uses base-60 (minutes and seconds) not base-10. Adding 2 hours 45 minutes + 1 hour 30 minutes does not equal 3 hours 75 minutes — it equals 4 hours 15 minutes. For payroll calculations, this matters: 8 hours 37 minutes is not 8.37 hours (that would be 8 hours and 22 minutes). It is 8.617 hours (37 / 60 = 0.617). Multiply by hourly rate using decimal hours, not the raw minutes figure.

How to Use the Time Calculator

Select the operation — add time, subtract time, or find duration between two specific times (start time and end time). Enter hours, minutes, and seconds. For payroll use, enter clock-in and clock-out times and the calculator shows total hours worked in both HH:MM format and decimal hours. Overnight durations (clock-in at 10 PM, clock-out at 6 AM) are handled automatically. Multiply decimal hours by your hourly rate for payroll calculations.

Frequently Asked Questions

Enter your start time (clock-in) and end time (clock-out). Subtract any unpaid break time. Convert the result to decimal hours: divide minutes by 60. Example: 7 hours 45 minutes = 7 + (45/60) = 7.75 decimal hours. Multiply 7.75 × $18/hour = $139.50 pay for that shift.
Divide minutes by 60. Common conversions: 15 min = 0.25 hrs, 20 min = 0.33 hrs, 30 min = 0.5 hrs, 45 min = 0.75 hrs, 40 min = 0.67 hrs, 50 min = 0.83 hrs. Multiply decimal hours by hourly wage for exact pay per shift.
For an overnight shift from 10:00 PM to 6:30 AM: add 24 hours to the end time (6:30 AM + 24 = 30:30), then subtract start time (30:30 − 22:00 = 8:30). Total shift = 8 hours 30 minutes = 8.5 decimal hours. Our calculator handles this automatically.
Add the hours, add the minutes separately, then convert excess minutes to hours. Example: 2h 50min + 1h 35min + 3h 40min = 6h 125min = 6h + 2h 5min = 8h 5min. For weekly payroll totals, add all daily hours and convert total minutes to additional hours.
Both mean the same thing in most contexts — the length of a time period. Elapsed time typically refers to past events (how long has passed since something started). Duration refers to the total length of a defined period. Both are calculated as End Time − Start Time.