Time Calculator (Add & Subtract)
Calculator ToolsAdd or subtract hours, minutes, seconds
Embed this tool on your websiteFree
- Choose how tall the frame should be.
- Press Copy code.
- Paste it into your page, blog, WordPress or Notion HTML block.
The tool runs inside your visitor's browser, nothing is uploaded, and a small "Powered by ToolCloak" line stays under it. The second line (script) is optional: it makes the frame fit the tool's height.
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History
All history →Time Calculator (Add & Subtract) — at a glance
Add up or subtract times without getting tangled in 60-minute maths.
How to use it — step by step
Two durations in hours, minutes and seconds, and whether to add or subtract.
Enter your values
Fill in the boxes. Sensible example values are already filled in for you.
Calculate Time
Press the button. The answer is worked out instantly on your device.
Read or copy the result
See the big answer and the extra details, then press Copy to keep them.
Pro tips
Small things that make the result better.
Quick facts
Frequently Asked Questions
Can the answer be negative?+
Yes. If the second time is larger when subtracting, the result shows a minus sign.
How do I add more than two times?+
Add two, then use the result as the first time and add the next one.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.