How this calculator works
Planning a movie marathon means adding up more than just the runtimes — the breaks between films (for snacks, stretching or just resetting) add up too, especially across a trilogy or a full franchise. This calculator totals a list of film runtimes, adds a break after every film except the last, and tells you both the pure watch time and the full time commitment.
If you give it a start time, it also works out your finish time, including a clear note when the marathon runs past midnight into the next day — useful for figuring out whether an ambitious binge is actually realistic on a work night.
How the totals are built
Total watch time = sum of every film's runtimeTotal breaks = break length × (number of films − 1)Total time = total watch time + total breaksFinish time = start time + total time, wrapping past midnight into the next day when neededBreaks are counted between films, not after the last one — a marathon of 3 films has exactly 2 breaks, not 3.
Worked example: three films, 15-minute breaks, starting at 6:00 PM
- Add up the runtimes: 142 + 128 + 164 = 434 minutes of film, which is 7 hours 14 minutes.
- Add the breaks: 2 breaks (between films 1-2 and 2-3) × 15 minutes = 30 minutes.
- Total time commitment: 434 + 30 = 464 minutes, or 7 hours 44 minutes.
- Starting at 6:00 PM (18:00) and adding 464 minutes lands at 1:44 AM — past midnight, so the calculator flags it as finishing the next day.
Frequently asked questions
Does the calculator count a break after the last film?
No. Breaks only happen between films, so a marathon of n films has exactly n − 1 breaks — a single film has none at all, no matter what break length you enter.
What if my marathon crosses midnight?
The finish time wraps around the clock and the calculator adds a '+1 day' (or more, for very long marathons) note so it's clear the listed time is on the following day, not the same evening.
Can I skip the start time?
Yes — the start time is optional. Leave it blank to see just the total watch time and total time including breaks, without a specific finish clock time.
How do I enter the runtimes?
List each film's runtime in minutes, separated by commas, in the order you plan to watch them — for example 136, 142, 165. The per-film table then shows the running total after each one.
Can I calculate a marathon with no breaks between films at all?
Yes — enter 0 as the break length. Since total breaks equals break length times the number of films minus one, a break length of 0 makes total breaks 0 no matter how many films you list, so the total time collapses to just the sum of the runtimes, watched back-to-back with no gaps.