Find what time your movie will end from its start time and runtime, add trailers or pauses, or see how much time is left in the movie.
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Calculator Functions
| Function | What it does | What it requires |
|---|---|---|
| Find end time | Finds the clock time a movie ends | Requires the start time and the movie runtime |
| Find start time | Finds the clock time a movie has to start to finish by a set time | Requires the end time and the movie runtime |
| Find duration | Finds the minutes between a start time and an end time | Requires the start time and the end time, plus the end day when the gap is longer than a day |
| Theater planner | Estimates the time of leaving a cinema, allowing for ads and trailers, extra credits and an exit buffer | Requires the listed start time and the movie runtime; the three allowances start at 0 minutes |
| At-home planner | Estimates the finish time of a movie watched at home with pauses | Requires the start time and the movie runtime; total pause time and extra credits start at 0 minutes |
| Time left in movie | Finds the minutes remaining and the share of the movie already watched | Requires the movie runtime and the time watched so far |
Start and end times are entered on a 24-hour clock, so 7:30 PM is 19:30, and results are shown in both 12-hour and 24-hour form with a note when they fall on a different day. The runtime is entered in minutes, hours or seconds and must come to a whole number of minutes. Runtime presets run from 1 h 25 min to 3 h.
Movie End Time Formulas
| E | End time, in minutes after midnight on the start day |
| S | Start time, in minutes after midnight (hours × 60 + minutes) |
| R | Movie runtime (min) |
A day has 1,440 minutes. When the total passes 1,440, the whole days are counted off and the remainder is the clock time. A 135-minute movie starting at 10:30 PM gives 1,350 + 135 = 1,485 minutes, which is 45 minutes into the next day, or 12:45 AM.
Find end time
The main formula applies directly. A movie that starts at 7:30 PM and runs 2 hours 15 minutes ends at 9:45 PM. The table gives the end time for a movie that starts at 7:00 PM, before any trailers or pauses.
| Runtime | Minutes | Ends, from a 7:00 PM start |
|---|---|---|
| 1 h 30 min | 90 | 8:30 PM |
| 1 h 45 min | 105 | 8:45 PM |
| 2 h | 120 | 9:00 PM |
| 2 h 15 min | 135 | 9:15 PM |
| 2 h 30 min | 150 | 9:30 PM |
| 3 h | 180 | 10:00 PM |
Find start time
The runtime is subtracted from the end time. To be finished by 11:00 PM, a 142-minute movie has to start at 8:38 PM. If the subtraction passes midnight, the start is on the day before the end.
Find duration
D is the elapsed time in minutes and n is the number of days the end falls after the start. With the end day left blank, n is 0 when the end time is the same as or later than the start time and 1 when it is earlier. A movie that starts at 7:00 PM and finishes at 9:16 PM lasts 136 minutes, or 2 h 16 min. One that starts at 11:00 PM and finishes at 1:10 AM lasts 130 minutes.
Theater planner
T is the minutes of ads and trailers before the movie, C is extra credits and B is an exit buffer for leaving the auditorium. For a 7:00 PM showing of a 120-minute movie with 15 minutes of trailers and a 10-minute buffer, the movie itself begins at 7:15 PM, the runtime ends at 9:15 PM and the estimated exit is 9:25 PM. The trailer presets are 10, 15, 20 and 25 minutes, the credits presets 5, 8 and 10 minutes, and the buffer presets 5 and 10 minutes.
At-home planner
P is the total time the movie is paused and C is extra credits. A 110-minute movie started at 8:00 PM with 15 minutes of pauses finishes at 10:05 PM, against 9:50 PM with no pauses.
Time left in movie
W is the time watched so far, read from the player. At 65 minutes into a 148-minute movie, 148 − 65 = 83 minutes are left, or 1 h 23 min, and 43.9% has been watched. A watched time longer than the runtime is rejected.
Limits of This Estimate
- The result is clock arithmetic with no calendar date, so a night when the clocks change for daylight saving time is off by an hour.
- Trailer, credit, pause and buffer times are estimates entered by the viewer, and the presets are round figures, not any cinema's schedule. The length of ads and trailers varies by cinema and showing, so the exit time is only as good as that guess.
- Extra credits should stay at 0 when the runtime already includes the credits, or they are counted twice.
