Results
End Time: --:--
Actual Length: --h --m
Free online Extra Time Calculator – Determine Actual time length and end time needed for your tasks, projects, exams or events.
Check also: Attendance Calculator
Formula:
Math behind the Extra Time Calculator:
How Extra Time is Calculated
1️⃣ Total Time + Extra %
(Hours × 60 + Minutes) × (1 + Extra%)
Example: 2h30m + 20% = (150) × 1.20 = 180 mins
2️⃣ Convert to Hours & Minutes
Hours = (TotalMins ÷ 60)
Minutes = Remainder
Example: 180 mins → 3h 0m
3️⃣ Add to Start Time
EndTime = StartTime + Hours:Minutes
Example: 14:30 + 3h00m = 17:30 (5:30 PM)
Automatically handles time overflow (60 mins → 1h, 24h → 12 AM)
FAQ
How much is 25% of 2 hours?
You can follow these steps:
Convert 2 hours to minutes = 2 * 60 minutes = 120 minutes
25% of 120 minutes = 120 minutes * 0.25 = 30 minutes
So, 25% of 2 hours is equal to 30 minutes.