Time Duration Calculator

Calculate Duration Between Times

Duration
8 hours 30 minutes

Add or Subtract Time

Result
16:30:00

Time Duration Calculator Guide

Use this free time duration calculator from BitBotBoo to add or subtract hours and minutes, find elapsed time between clocks, and plan schedules accurately without sending your entries to any server.

How it works
  1. Enter start and end times—or durations to add/subtract.
  2. Choose add or subtract mode if applicable.
  3. Calculate total hours and minutes.
  4. Use for timesheets or scheduling.
Key features/options
  • Add/subtractCombine or remove time blocks.
  • Elapsed timeBetween two clock times.
  • Hours & minutesClear totals.
  • LocalNo server upload.
Common uses
  • Work hours and overtime.
  • Project time tracking.
  • Event scheduling.
  • Travel layover math.
Privacy & features
  • Entries not stored.
  • Free.
  • Scheduling-friendly output.
FAQ

Over midnight?

Enter dates or use modes that span midnight if supported.

Decimal hours?

Shows hours and minutes; convert decimals manually if needed.

Saved?

No.