Time Calculator

Add, subtract & calculate time

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About Time Calculator

A versatile time calculator with three modes: Time Arithmetic for adding and subtracting hours, minutes, and seconds; Timecard Calculator for computing total work hours from clock-in/out times across multiple days; and Time Between for calculating the exact duration between two times or dates. Supports 12-hour and 24-hour formats, handles overnight shifts, calculates overtime, and converts between time units. 100% client-side — all calculations happen in your browser.

Time Calculator Features

  • Add & subtract time
  • Timecard mode
  • Time between dates
  • 12h & 24h formats
  • Overtime calculation
  • Multiple entries
  • Unit converter

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