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Finance & LoansGenerated accuracy model review: 2026-05-06
Finance Calculator accuracy and testing
This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.
Formula source
- Formulas: • **Future Value**: FV = PV * (1 + r)^n • **Present Value**: PV = FV / (1 + r)^n Where r is the rate and n is the number of periods.
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- Solve For: Future Value (FV)
- Known Amount (PV/FV): $1,000
- Interest Rate: 5%
- Number of Years: 10
Expected outputs
- Calculated Value: $1,628.89
Known limitations
- Assumes annual compounding. Does not handle regular payments (PMT) like an annuity calculator.
Assumptions
- Inputs are interpreted exactly as entered in the calculator form.
- The calculation runs locally in the browser using the current checked-in calculator definition.
Unit handling
- Solve For accepts one of the configured options.
- Known Amount (PV/FV) accepts values in $.
- Interest Rate accepts values in %.
- Number of Years accepts numeric values.
- Calculated Value is displayed as currency.
Rounding rules
- Number displays use up to 2 decimal places in the calculator UI.
- Currency outputs are displayed with standard US dollar formatting.
Version history
1.0.0 - 2026-05-06
Generated accuracy and testing page from the current finance-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for Finance Calculator.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.