Time Calculator

Perform time-based calculations with ease. Add or subtract time, or find the duration between two points in time, down to the second.

Choose Calculation Mode
Start Time (24h format)
Operation

Your Results

Choose a mode, enter the times, and click "Calculate".

Your Guide to Time Calculation

Time is a constant, but calculating it doesn't have to be a constant struggle. Our Time Calculator simplifies two common tasks: finding a new time by adding or subtracting a duration, and measuring the exact duration between a start and end time. This tool is invaluable for anyone who works with schedules, logs, or deadlines.

How to Use the Time Calculator

The calculator offers two distinct modes for your convenience.

1. Add or Subtract Time

This function is perfect for projecting future times or finding a time in the past. For example, "What time will it be in 8 hours and 45 minutes?"

  1. Select the "Add / Subtract Time" option.
  2. Enter the Start Time in 24-hour format (e.g., 14:30:00 for 2:30 PM).
  3. Choose the Operation: Add or Subtract.
  4. Enter the duration in hours, minutes, and/or seconds that you wish to add or subtract.
  5. Click "Calculate" to see the resulting time. The result will also indicate if the new time falls on a previous or next day.

2. Calculate Time Between Two Times

Use this mode to find the precise duration between a start and end point. It's ideal for calculating work hours on a timesheet or the length of an event.

  1. Select the "Time Between Two Times" option.
  2. Enter the Start Time and End Time in 24-hour format.
  3. If the end time occurs on the following day (e.g., starting a shift at 10 PM and ending at 6 AM), check the "End time is on the next day" box.
  4. Click "Calculate" to get a full breakdown of the duration in hours, minutes, and seconds.

Common Uses for a Time Calculator

For calculations that span several days, weeks, or months, our Date Calculator is the perfect companion tool. And if you're curious about the total time you've been alive, check out the Age Calculator for a detailed breakdown.