This page explains the simplified models used across MyCalcVault so readers can understand what the calculators do and do not include.
The loan calculators use a standard amortization formula for fixed-rate installment loans. The monthly payment is derived from the loan balance, monthly rate, and number of payments.
These pages are designed to estimate principal-and-interest payments. They do not automatically include taxes, insurance, registration, HOA fees, maintenance, or lender-specific charges.
The growth calculators assume monthly compounding and a constant contribution schedule. Each period adds the monthly contribution after applying the monthly rate to the current balance.
That makes the model simple and easy to understand, but it also means the estimate will differ from accounts or portfolios where the rate changes, contributions are irregular, or fees and taxes are material.
A simplified model can still be highly useful for comparison and planning. The goal is not to recreate every line item from a lender or brokerage statement; it is to help readers understand how the main variables change the result.
If you need an exact number for a real transaction, use the page as a planning tool and verify the details directly with the relevant lender, bank, insurer, or advisor.
If you find a formula bug, misleading explanation, or edge case that should be clarified, please use the contact page so the issue can be reviewed.