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Time Calculator

Add or subtract time durations (hours, minutes, seconds) instantly.

00:00:00
Result (HH:MM:SS)

How to Use Time Calculator

  1. Enter the first time in HH:MM:SS format.
  2. Choose Add or Subtract.
  3. Enter the second time.
  4. Click Calculate to see the resulting duration.

Features

🎯

Accurate results

⚡

Instant calculation

🔒

100% private

📱

Mobile friendly

Frequently Asked Questions

Is it free?

Yes.

What format should I use?

HH:MM:SS, e.g. 02:30:00 for 2 hours 30 minutes.

What if subtraction goes negative?

The result is shown as a negative duration with a minus sign.

🤖 Ask AI about this tool

Tap a question for an instant answer. Full conversational AI is coming soon.

How do I add two time durations?
Convert both to total seconds, add them, then convert back to HH:MM:SS format — this tool does that automatically.
Can I use this for work hours?
Yes, it's handy for adding up shift durations or calculating time worked.
Does it handle values over 24 hours?
Yes, durations aren't capped at 24 hours since these are treated as durations, not clock times.

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