# Mortgage Amortization Calculator

> View the complete amortization schedule for your mortgage.

Page: https://askcalculators.com/calculator/mortgage-amortization-calculator/
Definition: https://askcalculators.com/calculator/mortgage-amortization-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/mortgage-amortization-calculator/schema.json
Version: 20.1.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/mortgage-amortization-calculator/?loanAmount=300000&interestRate=4.5&loanTerm=30

## Inputs
- loanAmount: Loan Amount ($); type=number; optional; default=300000
- interestRate: Interest Rate (%); type=number; optional; default=4.5
- loanTerm: Loan Term (Years); type=number; optional; default=30

## Outputs
- scheduledPayment: Scheduled payment; format=currency; primary
- totalInterest: Total interest; format=currency
- rowCount: Payment count; format=number
- lastBalance: Final balance; format=currency

## Formula
Payment = P ÷ n when the monthly rate is zero; otherwise P·r ÷ [1 − (1+r)^(−n)]. Each row applies interest = balance × r and principal = payment − interest; the last payment is limited to the amount due.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.