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Time Duration Calculator — Hours & Minutes

Calculate elapsed hours and minutes between two times of day.

Deterministic Math
Zero Data Collection
Client-Side Compute

Time & Duration Parameters

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Quick Interval Presets

Time Difference Formula

Transparent mathematical methodology explained in plain English.

Duration = EndTime - StartTime (+ 24 Hours if overnight)

Calculates minutes elapsed between two 24-hour time values.

Variables Explained:

  • StartTime: Beginning time of day.
  • EndTime: Concluding time of day.
Real Project Example

Flight from 8:45 AM to 3:20 PM

Travel time calculation.

Sample Project Inputs:
Start: 08:45
End: 15:20
Step-by-Step Calculation:
  1. Convert to minutes: Start = 8×60 + 45 = 525 min; End = 15×60 + 20 = 920 min.
  2. Difference: 920 - 525 = 395 minutes.
  3. Hours and minutes: 395 ÷ 60 = 6 hours and 35 minutes.
Calculated Answer: 6 hours, 35 minutes.
Verified Calculation Standards E-E-A-T Verified

Formulas calibrated against NIST Dimensional Standards & Peer-Reviewed Mathematical Formulas. Calculations are computed 100% client-side in your browser for absolute data privacy.

Knowledge Base

Frequently Asked Questions: Time Duration

Click any question below to expand quick answers, formulas, and expert tips.

Does this handle overnight times?

Yes. If the end time is earlier than the start time, the calculator automatically adds 24 hours to accommodate overnight shifts.