Time Duration
Calculator

Calculate the exact time between two times. Find hours, minutes and seconds for work shifts, billing, freelance projects, and time tracking.

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How to Use the Time Duration Calculator

Simply enter your start time and end time to instantly calculate the exact duration between them. Whether you're tracking work hours, measuring project time, or calculating billing hours, this calculator gives you precise results down to the second.

How do I calculate work hours for overtime?

Enter your start time in the first field and your end time in the second. The calculator will show total hours worked. If you worked past midnight, the end time will automatically account for the next day.

Can I use this for freelance billing?

Absolutely. Many freelancers use time duration calculators to track billable hours on projects. Enter your start and end times for each task, and you'll have precise duration data for invoicing.

What if I work through midnight?

This calculator automatically handles cross-midnight calculations. If your end time is earlier than your start time, it assumes you worked into the next day.

How accurate is the calculation?

This calculator is accurate to the second. It uses precise time inputs and mathematical calculations to ensure your duration measurements are exact.

Can I use this for break calculations?

Yes. If you want to calculate break time or lunch duration, simply enter the start time of your break and the end time. The result shows exactly how long your break was.