THE NUMBERS, EXPLAINED
How to use this calculator.
Whole-month billing with introductory pricing only for the first entered number of months. Insurance and tax should be included in supplied prices if applicable.
Start with your inputs
Enter stay (whole months), introductory months, intro monthly price, regular monthly price, one-time fees. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Stay (whole months) | 6 |
| Introductory months | 2 |
| Intro monthly price | 20 |
| Regular monthly price | 60 |
| One-time fees | 30 |
A worked example
With the example inputs above, introductory cost is 40. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Introductory cost | 40 |
| Standard-period cost | 240 |
| Total stay cost | 310 |
| Effective monthly cost | 51.666667 |
How this is calculated
Introductory cost
Charge the smaller of stay months and offer months at the intro price.
Standard-period cost
Charge remaining stay months at the regular price.
Total stay cost
Add intro cost, standard cost and one-time fees.
Effective monthly cost
Divide total stay cost by billed months.
Symbols and units
- a
- Stay (whole months)
- b
- Introductory months
- c
- Intro monthly price
- d
- Regular monthly price
- e
- One-time fees
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
Whole-month billing with introductory pricing only for the first entered number of months. Insurance and tax should be included in supplied prices if applicable.
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?
Introductory cost; Standard-period cost; Total stay cost; Effective monthly cost. 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: Whole-month billing with introductory pricing only for the first entered number of months. Insurance and tax should be included in supplied prices if applicable.
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 →