Time Calculator

How to Use Time Calculator

1. Stay on the Add/Subtract Durations tab and enter hours, minutes, and seconds for each row, selecting + or −.
2. Click Add Row to include more durations; the total normalises live (e.g., 90 minutes becomes 1 hour 30 minutes).
3. View the big normalised total, plus equivalent values in total seconds, total minutes, and decimal hours.
4. Switch to the Time Between Dates tab, select two date‑times, and see the exact difference in days, hours, and minutes.

Benefits of Time Calculator

• Handles base‑60 arithmetic that spreadsheets often get wrong — no more manual carry‑over mistakes.
• Mix addition and subtraction in a single calculation; ideal for editing video timelines or tracking flexi‑time balances.
• Date‑difference mode extends the tool beyond durations, making it useful for travel planning or countdowns.
• All calculations are instant and local; no data is sent anywhere, so you can use it for sensitive timesheet data.

Frequently Asked Questions

How do I add 2 hours 45 minutes and 1 hour 30 minutes?

Enter 2:45:00 on the first row with +, and 1:30:00 on the second row. The total updates to 4:15:00 automatically, because 75 minutes normalise to 1 hour 15 minutes.

Can I subtract a larger time from a smaller one?

Yes, the result will display a negative time if the total duration goes below zero. This helps catch scheduling errors or flexi‑time deficits.

What if I only need hours and minutes, not seconds?

Just leave the seconds field at zero. The tool works perfectly with only hours and minutes; all conversions remain accurate.

Is Time Calculator free and private?

Yes — it is 100% free, needs no sign-up, and everything runs in your browser; your data never leaves your device.