THE NUMBERS, EXPLAINED
How to use this calculator.
Quantities are common to both specifications; entered rates must cover comparable line scope. Taxes and lifecycle performance are excluded.
Start with your inputs
Enter common line quantities, option a rates by line (currency), option b rates by line (currency), option a fixed extras (currency), option b fixed extras (currency). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Common line quantities | 10,20 |
| Option A rates by line (currency) | 5,8 |
| Option B rates by line (currency) | 6,7 |
| Option A fixed extras (currency) | 50 |
| Option B fixed extras (currency) | 70 |
A worked example
With the example inputs above, option a total (currency) is 260. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Option A total (currency) | 260 |
| Option B total (currency) | 270 |
| Option B minus A (currency) | 10 |
How this is calculated
Option A total (currency)
Apply option A rates to shared quantities and add extras.
Option B total (currency)
Apply option B rates and its fixed extras.
Option B minus A (currency)
Compare complete option totals.
Symbols and units
- a
- Common line quantities
- b
- Option A rates by line (currency)
- c
- Option B rates by line (currency)
- d
- Option A fixed extras (currency)
- e
- Option B fixed extras (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
Quantities are common to both specifications; entered rates must cover comparable line scope. Taxes and lifecycle performance are excluded.
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?
Option A total (currency); Option B total (currency); Option B minus A (currency). 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: Quantities are common to both specifications; entered rates must cover comparable line scope. Taxes and lifecycle performance are excluded.
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: Describe and Identify Cost Drivers ↗
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 →