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Everyday LifeGenerated accuracy model review: 2026-05-06
Inflation Calc 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
- **Future Value = Present Value × (1 + Rate/100)^Years** This uses the standard compound interest formula.
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- Inflation Rate Preset: bls_cpi_u_march_2026_yoy
- Current Price: $1,000
- Manual Inflation Rate: 3%
- Years: 10
Expected outputs
- Future Price: $1,383.58
- Increase: $383.58
Known limitations
- This page documents the checked-in calculator logic and does not certify results for every real-world edge case.
- Use the result as a planning estimate unless the calculator page states a stricter purpose.
Assumptions
- The rate is treated as a constant annual average.
- Compounding happens once per year.
- Taxes, fees, and other one-off changes are not included separately.
Unit handling
- Inflation Rate Preset accepts one of the configured options.
- Current Price accepts values in $.
- Manual Inflation Rate accepts values in %.
- Years accepts numeric values.
- Future Price is displayed as currency.
- Increase 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 simple-inflation-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for Inflation Calc.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.