THE NUMBERS, EXPLAINED
How to use this calculator.
Boarding and alighting use separate dedicated doors simultaneously. Passenger flow is evenly shared among corresponding doors; this is a measured operational estimate.
Start with your inputs
Enter boarders by stop, alighters by stop, measured boarding rate (people/s/door), measured alighting rate (people/s/door), dedicated boarding doors, dedicated alighting doors, fixed door overhead per stop (s). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Boarders by stop | 10,20 |
| Alighters by stop | 5,10 |
| Measured boarding rate (people/s/door) | 1 |
| Measured alighting rate (people/s/door) | 2 |
| Dedicated boarding doors | 1 |
| Dedicated alighting doors | 1 |
| Fixed door overhead per stop (s) | 5 |
A worked example
With the example inputs above, estimated dwell by stop (s) is 15, 25. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Estimated dwell by stop (s) | 15, 25 |
| Total modeled stop dwell (s) | 40 |
How this is calculated
Estimated dwell by stop (s)
Take the slower simultaneous boarding/alighting duration and add door overhead.
Total modeled stop dwell (s)
Sum modeled dwell over stops.
Symbols and units
- a
- Boarders by stop
- b
- Alighters by stop
- c
- Measured boarding rate (people/s/door)
- d
- Measured alighting rate (people/s/door)
- e
- Dedicated boarding doors
- g
- Dedicated alighting doors
- h
- Fixed door overhead per stop (s)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
Boarding and alighting use separate dedicated doors simultaneously. Passenger flow is evenly shared among corresponding doors; this is a measured operational estimate.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Estimated dwell by stop (s); Total modeled stop dwell (s). The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Boarding and alighting use separate dedicated doors simultaneously. Passenger flow is evenly shared among corresponding doors; this is a measured operational estimate.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
OpenStax: Solve proportions and their applications ↗
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
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