THE NUMBERS, EXPLAINED
How to use this calculator.
One constant supplied retention rate with no cap, tax or release. Negative payment due indicates an overpayment/adjustment for review.
Start with your inputs
Enter cumulative completed-work valuation (currency), retention percentage, previous certified payments (currency), approved current-period deductions (currency). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Cumulative completed-work valuation (currency) | 10000 |
| Retention percentage | 5 |
| Previous certified payments (currency) | 6000 |
| Approved current-period deductions (currency) | 200 |
A worked example
With the example inputs above, cumulative retention (currency) is 500. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Cumulative retention (currency) | 500 |
| Cumulative net certified value (currency) | 9,500 |
| Current payment due (currency) | 3,300 |
How this is calculated
Cumulative retention (currency)
Apply supplied retention rate to cumulative valuation.
Cumulative net certified value (currency)
Deduct retention from cumulative completed work.
Current payment due (currency)
Deduct previous payments and current approved deductions.
Symbols and units
- a
- Cumulative completed-work valuation (currency)
- b
- Retention percentage
- c
- Previous certified payments (currency)
- d
- Approved current-period deductions (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
One constant supplied retention rate with no cap, tax or release. Negative payment due indicates an overpayment/adjustment for review.
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?
Cumulative retention (currency); Cumulative net certified value (currency); Current payment due (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: One constant supplied retention rate with no cap, tax or release. Negative payment due indicates an overpayment/adjustment for review.
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 →