The Add Time Calculator makes it easy to add up multiple time values no conversions, no spreadsheets, and no guesswork. Whether you’re tallying up work hours, tracking total time for tasks, or calculating video or podcast runtimes, this tool does the math for you and gives you the total instantly.
You just type or paste your list of times each one on a new line and the tool adds them together. It supports both HH:MM and full HH:MM:SS formats, so whether you’re dealing with exact times or just hours and minutes, you’re covered. The result appears in a clean, readable format like 07:30:00, and flashes every time it updates, so you always know it’s working.
How to Use:
- Enter one time value per line in the input box on the left using
HH:MMorHH:MM:SSformat. - The total will update live as you type, or you can press Calculate to re-run it manually.
Here’s what each option does:
- Include seconds – When this is on, your total will display in full
HH:MM:SS. Turn it off if you only wantHH:MM. - Show line numbers Adds numbered lines to the left of the editor, like a code editor. Helpful for tracking errors or referencing long lists.
- Show annotations Highlights bad lines directly in the input editor with a red error marker on the left. You’ll still get the full warning list in the output, but this makes problems more visible instantly.
The output on the right gives you:
- A full total (based on your toggle settings)
- How many lines were valid vs. skipped
- Warnings for anything it couldn’t parse
You can also:
- Resize both the input and output areas vertically if you’re working with big lists
- Copy your output with one click using the Copy button it even flashes when successful
What Add Time Calculator can do:
It gives you a total time for however many entries you input whether it’s 3 short clips or 30 work logs. It accepts flexible time formats and returns your answer in hours, minutes, and seconds, so you can plug it into schedules, logs, or billing sheets immediately.
Example:
Input:
01:15
02:30
00:45
03:00Include seconds: On Output:
Total Time: 07:30:00
Entries Counted: 4Add Time Calculator Table:
This table shows real-world examples of durations being summed, including formats with and without seconds, and common scenarios like gym workouts, video editing, or billing hours.
| Entries | Include Seconds | Total Time |
|---|---|---|
| 01:00 02:15 00:30 | Off | 03:45 |
| 01:00:30 02:15:00 00:30:15 | On | 03:45:45 |
| 00:59 00:01 | Off | 01:00 |
| 12:00 13:00 01:00 | Off | 26:00 |
| 00:00:10 00:00:50 | On | 00:01:00 |
| 01:15 bad 02:00 | Off | 03:15 |
| bad nope what | On | No valid time values. |
| 99:59 00:01 | Off | 100:00 |
| 10:00 10:00 10:00 | Off | 30:00 |
| 00:45:30 00:14:30 | On | 01:00:00 |
Common Use Cases:
Use it to add up hours worked, combine track lengths, total up appointments, or log progress in a time study. The Add Time Calculator is fast, clean, and easy it saves you time while adding up yours.
Useful Tools & Suggestions:
Once you’ve added everything up, you might realize you need to back a few steps out that’s where the Time Subtraction Calculator comes in. And if your input times are a mess, Normalize Clock Times can help straighten things out before you even get started.