THE NUMBERS, EXPLAINED
How to use this calculator.
Single dated observation interval without rollover or odometer replacement. Positive unexplained distance indicates distance missing from trip logs.
Start with your inputs
Enter start odometer (km), end odometer (km), recorded trip distances (km). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Start odometer (km) | 10000 |
| End odometer (km) | 10500 |
| Recorded trip distances (km) | 100,150,200 |
A worked example
With the example inputs above, odometer distance (km) is 500. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Odometer distance (km) | 500 |
| Logged distance (km) | 450 |
| Unexplained distance (km) | 50 |
How this is calculated
Odometer distance (km)
Subtract start reading from end reading.
Logged distance (km)
Add recorded trips within the interval.
Unexplained distance (km)
Subtract trip-log distance from odometer increase.
Symbols and units
- a
- Start odometer (km)
- b
- End odometer (km)
- c
- Recorded trip distances (km)
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
Single dated observation interval without rollover or odometer replacement. Positive unexplained distance indicates distance missing from trip logs.
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?
Odometer distance (km); Logged distance (km); Unexplained distance (km). 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: Single dated observation interval without rollover or odometer replacement. Positive unexplained distance indicates distance missing from trip logs.
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.
Read the quality report →