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Finance & LoansGenerated accuracy model review: 2026-05-06
Personal Loan 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
- Uses the checked-in calculator function for personal-loan-calculator.
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- Loan Amount: $10,000
- Interest Rate (APR): 10.5%
- Loan Term: 3 Years
Expected outputs
- Estimated Monthly Payment: $325.02
- Total Interest Paid: $1,700.88
- Total Payback Amount: $11,700.88
Known limitations
- This calculator assumes a fixed interest rate and does not account for origination fees (often 1-8% of the loan amount) or late payment penalties.
Assumptions
- The model assumes a fixed-rate installment loan with equal monthly payments over the full term.
- APR is treated as the effective annual borrowing rate for the schedule and no separate origination fee line is modeled.
- Payments start immediately and remain unchanged through payoff.
Unit handling
- Loan Amount accepts values in $.
- Interest Rate (APR) accepts values in %.
- Loan Term accepts values in Years.
- Estimated Monthly Payment is displayed as currency.
- Total Interest Paid is displayed as currency.
- Total Payback Amount 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.
- Input precision follows configured step values where provided.
Version history
1.0.0 - 2026-05-06
Generated accuracy and testing page from the current personal-loan-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for Personal Loan Calculator.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.