Use our free Time Duration Calculator to get a clear estimate in seconds. Enter your values and see an instant result. Create a free account if you want your inputs saved for next time.
How to use this time duration calculator
- Enter each requested value using the units displayed beside the field.
- Select any options that match your situation, then choose Calculate result.
- Review the main answer and supporting values. Change any input to compare another scenario.
The formula
Duration = end time − start time; if negative, add 24 hours.
The calculator uses the full precision of your inputs and rounds only the values shown on screen. This helps avoid compounding rounding errors.
Worked example
From 9:30 AM to 5:15 PM is 7 hours and 45 minutes.
Keep in mind: This result is an estimate for planning and education. It does not replace personalized financial, medical, legal, or other professional advice.