# Amortization Calculator

> View your loan amortization schedule and see how your principal balance decreases over time.

Page: https://askcalculators.com/calculator/amortization-calculator/
Definition: https://askcalculators.com/calculator/amortization-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/amortization-calculator/schema.json
Version: 7.0.0
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/amortization-calculator/?amount=200000&rate=5&years=30

## Inputs
- amount: Loan Amount ($); type=number; optional; default=200000
- rate: Interest Rate (%); type=number; optional; default=5
- years: Loan Term (Years); type=number; optional; default=30
- startDate: Start Date; type=date; optional

## Outputs
- result: Result; format=text; primary

## Formula
Payment uses the standard installment-loan formula; each month interest = balance × monthly rate and principal = payment − interest.

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