Add Time Calculator
Copy-paste times from schedules, timesheets, or workout logs and see the combined total instantly.
Use “HH:MM” or “HH:MM:SS”. Lines can include leading zeros or not.
Total Time
Formatted total
04:30:00
HH:MM:SS format
Breakdown
0 day(s), 4 hour(s), 30 minute(s), 0 second(s)
4.5 hours • 270 minutes
How to Use This Calculator
Gather your durations
Paste times from timesheets, meeting notes, or workout logs into the textbox—one duration per line.
Use consistent formatting
Enter HH:MM or HH:MM:SS. Add seconds for precise timers. Lines without content are ignored.
Review totals
See the sum in HH:MM:SS plus conversions to days, hours, and minutes. Use it for payroll, productivity, or training logs.
Formula
Total Seconds = Σ (Hours × 3600 + Minutes × 60 + Seconds)
Days = floor(Total Seconds ÷ 86,400)
HH:MM:SS = format(Total Seconds mod 86,400)
Example: 02:45 + 01:15 + 00:30 = 14,400 seconds = 04:30:00 (4.5 hours).
Why It Matters
Summing time manually is error-prone. Automating it ensures accurate billing, project tracking, and compliance with work limits.
- Reconcile timesheets to confirm payroll and overtime totals.
- Compare planned vs. actual project hours for better estimates.
- Track study, practice, or training time for goal accountability.
- Aggregate multiple video/audio clip lengths before editing.
Frequently Asked Questions
Can I include negative durations?
This tool sums positive durations. If you need net totals, convert deductions manually and subtract.
Does it support decimal hours?
Not directly. Convert decimal hours to HH:MM first (e.g., 1.5 hours → 01:30) for best accuracy.
What about days over 24 hours?
The calculator outputs days separately so you can see when totals exceed 24 hours.
Can I export results?
Copy the totals and breakdown into spreadsheets or reports. The durations list remains editable for adjustments.