THE NUMBERS, EXPLAINED
How to use this calculator.
Simple undiscounted payback with constant annual demand; excludes financing, tax, resale value and capital replacements.
Start with your inputs
Enter asset purchase and setup cost (currency), rental days per year scenarios, rental revenue per day (currency), variable cost per rented day (currency), annual fixed maintenance cost (currency). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Asset purchase and setup cost (currency) | 6000 |
| Rental days per year scenarios | 60,100 |
| Rental revenue per day (currency) | 100 |
| Variable cost per rented day (currency) | 20 |
| Annual fixed maintenance cost (currency) | 1000 |
A worked example
With the example inputs above, annual net cash contribution by scenario is 3800, 7000. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Annual net cash contribution by scenario | 3800, 7000 |
| Simple payback years by scenario | 1.578947, 0.857143 |
| Annual break-even rented days | 13 |
How this is calculated
Annual net cash contribution by scenario
Deduct variable hire costs and annual maintenance from rental receipts.
Simple payback years by scenario
Divide upfront cost by positive annual cash contribution.
Annual break-even rented days
Calculate days needed to cover annual maintenance.
Symbols and units
- a
- Asset purchase and setup cost (currency)
- b
- Rental days per year scenarios
- c
- Rental revenue per day (currency)
- d
- Variable cost per rented day (currency)
- e
- Annual fixed maintenance cost (currency)
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
Simple undiscounted payback with constant annual demand; excludes financing, tax, resale value and capital replacements.
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?
Annual net cash contribution by scenario; Simple payback years by scenario; Annual break-even rented days. 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: Simple undiscounted payback with constant annual demand; excludes financing, tax, resale value and capital replacements.
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: Calculate a Break-Even Point in Units and Dollars ↗
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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