THE NUMBERS, EXPLAINED
How to use this calculator.
Uses supplied contract weights and index changes for one adjustment period. Does not determine whether an adjustment is contractually allowed.
Start with your inputs
Enter current contract price (currency), contract cost-component weights (%), supplied component index changes (%). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Current contract price (currency) | 10000 |
| Contract cost-component weights (%) | 60,30,10 |
| Supplied component index changes (%) | 5,10,0 |
A worked example
With the example inputs above, weighted price adjustment (%) is 6. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Weighted price adjustment (%) | 6 |
| Price adjustment (currency) | 600 |
| Adjusted contract price (currency) | 10,600 |
How this is calculated
Weighted price adjustment (%)
Weight each supplied index change by the contractual component share.
Price adjustment (currency)
Apply weighted percentage change to current contract price.
Adjusted contract price (currency)
Add the calculated adjustment to current price.
Symbols and units
- a
- Current contract price (currency)
- b
- Contract cost-component weights (%)
- c
- Supplied component index changes (%)
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
Uses supplied contract weights and index changes for one adjustment period. Does not determine whether an adjustment is contractually allowed.
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?
Weighted price adjustment (%); Price adjustment (currency); Adjusted contract price (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: Uses supplied contract weights and index changes for one adjustment period. Does not determine whether an adjustment is contractually allowed.
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 →