A week of daily figures has to be added before it means anything, and adding times by hand is where the carry at sixty goes wrong. This calculator takes the whole list at once: the five entries 7:30, 8:15, 6:45, 8:00, 5:20 come to 2150 minutes, which is 35h 50m or 35.83 decimal hours.
Working in total minutes first is what makes it reliable. Each entry is converted to minutes, the list is summed as plain integers, and only the final total is converted back into hours and minutes. There is no intermediate carry to lose, however long the list.
The average and the largest entry are given alongside the total because they answer the follow-up question. A weekly total tells you the volume; the spread tells you whether it came from steady days or one very long one.
The formula
n- Number of entries
Σ- Total minutes across the list
A- Mean entry length
L- Longest single entry
How it works, step by step
- Paste the durations separated by commas, each as H:MM.
- Decimal entries such as 7.5 are accepted in the same list.
- Read the total in hours and minutes and in decimal form.
- Check the average and longest entry to see how the total is distributed.
Worked examples
A five-day week
The entries 7:30, 8:15, 6:45, 8:00, 5:20 convert to 450, 495, 405, 480, 320 minutes. The sum is 2150 minutes, or 35h 50m, which is 35.83 decimal hours — 4.17 hours under a 40-hour target.
The average against the longest day
The mean entry is 7h 10m while the longest is 8h 15m and the shortest 5h 20m. The spread of 2h 55m between best and worst day is invisible in the total alone.
How to read your score
Frequently asked questions
What formats can the list use?
H:MM values such as 7:30, plain decimals such as 7.5, and forms like 90m. Entries are separated by commas, semicolons or line breaks, and anything unreadable is skipped rather than counted as zero.
How many entries can I add?
There is no fixed limit. The list is parsed in one pass, so a month of daily figures works as easily as a week.
Why is the average useful?
Because two identical weekly totals can come from very different weeks. A 36-hour week of five even days is not the same as one of four short days and one twelve-hour day.
Does it round each entry before adding?
No. Every entry is held as whole minutes and summed exactly, so the total is not affected by rounding. Only the decimal display is rounded, to two places.
Weekly totals reference
| Daily entries | Total | Decimal hours | Average day |
|---|---|---|---|
| 8:00, 8:00, 8:00, 8:00, 8:00 | 40h 00m | 40.00 | 8h 00m |
| 7:30, 8:15, 6:45, 8:00, 5:20 | 35h 50m | 35.83 | 7h 10m |
| 9:15, 9:30, 9:00, 9:45 | 37h 30m | 37.50 | 9h 22m |
| 4:00, 4:30, 3:45, 4:15, 4:00 | 20h 30m | 20.50 | 4h 06m |
| 10:00, 12:30, 6:00, 8:45, 7:15 | 44h 30m | 44.50 | 8h 54m |
Totals are summed in whole minutes, so no rounding error accumulates down the list.