Time Addition Calculator
Need to add times together? Paste a list of durations below — one per line or space-separated — and this calculator will add them all up and give you the total in days, hours, minutes, and seconds. Works with hours:minutes:seconds, minutes:seconds, plain seconds, or decimal-separated formats interchangeably.
Input
Results
How to Add Times Together
Time addition isn't hard, but it's tedious — carrying over 60 seconds to a minute, then 60 minutes to an hour, gets old fast when you have a long list. This calculator handles all of that automatically.
Enter your times in the box above, one per line or separated by spaces, then click Add Times. The total appears immediately, broken down into days, hours, minutes, and seconds.
Accepted Time Formats
The calculator recognizes five formats, and you can mix them freely in the same input:
| Format | Meaning | Example |
|---|---|---|
| Whole number | Treated as seconds | 90 → 1 min 30 sec |
mm:ss or mm.ss |
Minutes and seconds | 4:30 → 4 min 30 sec |
hh:mm:ss or hh.mm.ss |
Hours, minutes, seconds | 1:22:45 |
Both colons and periods work as separators, so 1:22:45 and 1.22.45 are treated identically. Individual components don't need to be zero-padded — 102:953 is valid and simplifies correctly (102 minutes + 953 seconds = 1 hour, 57 minutes, 53 seconds). Anything that doesn't match one of these patterns is silently ignored, so stray labels or blank lines won't break the result.
Common Use Cases
Adding up video or audio durations — Got a playlist of videos and need to know the total runtime? Paste all the timestamps in and get the sum in seconds.
Totaling work or billable hours — If you track time in mm:ss or hh:mm:ss increments, this is the fastest way to add them all together without a spreadsheet.
Lesson and activity planning — A common teacher use case: you have a set of videos or activities that each run some number of minutes and seconds, and you need to know whether they'll fit in a class period. Add them all together here in a few seconds.
Race and lap times — Add up individual lap times to get a total race time, or compare cumulative splits.
Music and podcast production — Add segment lengths to plan episode runtime.
Examples
Example 1: Add a Playlist of Video Lengths
You have four videos: 12:34, 8:05, 22:18, and 6:47. Enter them one per line:
12:34
8:05
22:18
6:47
Total: 49 minutes, 44 seconds.
Example 2: Mix of Hours and Minutes
Three work sessions: 1:15:00, 45:30, and 2:00:00.
1:15:00
45:30
2:00:00
Total: 4 hours, 30 seconds. (The 45 minutes and 30 seconds from the second entry carry over correctly.)
Example 3: Plain Seconds
Three audio clips measured in seconds: 210, 95, 430.
210
95
430
Total: 12 minutes, 15 seconds.
Frequently Asked Questions
How does time addition work? The calculator converts every entry to seconds, adds them all up, then converts the total back to days, hours, minutes, and seconds. The same logic you'd use by hand — just faster for long lists.
Can I mix formats in the same input?
Yes. You can have 1:30:00, 45:22, and 90 all in the same list and they'll be handled correctly.
Does it support times over 24 hours? Yes. If the total exceeds 24 hours, the result includes a days component (e.g., "1 day, 3 hours, 22 minutes").
What if I accidentally include text labels? Anything that doesn't look like a time is ignored. You can paste a full export with labels and the calculator will find and total only the valid time values.
What's the maximum number of times I can add? There's no enforced limit — paste as many entries as you need.
Can I add times with decimal seconds like 1:22.5? Not currently. The calculator works with whole-second precision. Sub-second values should be rounded before entry.
