Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Fixed-rate payment (principal + interest)
\[M = P\,\frac{r(1+r)^{n}}{(1+r)^{n}-1}\]
M = P * [ r(1+r)^n ] / [ (1+r)^n - 1 ]
Variables and units
P
= principal (loan amount)
(currency)
r
= periodic interest rate (annual rate ÷ payments per year)
(1)
n
= total number of payments (years × payments per year)
(count)
M
= periodic payment for principal + interest
(currency)
E
= extra principal payment per period
(currency)
T
= property tax (annual or monthly depending on input)
(currency)
I
= homeowners insurance (annual or monthly depending on input)
(currency)
HOA
= homeowners association dues (monthly)
(currency)
Sources (authoritative):
Home
— calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/
Finance
— calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/finance
Mortgage & Real Estate
— calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/subcategories/mortgage-real-estate
APR Calculator
— calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/apr
Simple Loan Calculator
— calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/simple-loan-calculator
1031 Exchange
— calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/1031-exchange
Changelog
Version:
0.1.0-draft
Last code update:
2026-01-19
0.1.0-draft
· 2026-01-19
Initial audit spec draft generated from HTML extraction (review required).
Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
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