# Amortization Schedule Calculator: Equal Principal Payments

> Create a loan schedule with the same principal amount paid every period and declining total payments.

Page: https://askcalculators.com/calculator/amortization-schedule-equal-principal-payments-calculator/
Definition: https://askcalculators.com/calculator/amortization-schedule-equal-principal-payments-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/amortization-schedule-equal-principal-payments-calculator/schema.json
Version: 1.0.0
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-schedule-equal-principal-payments-calculator/?principal=100000&annualRate=6&paymentsPerYear=12&years=5

## Inputs
- principal: Loan principal; type=money; required; default=100000; min=0.01
- annualRate: Annual interest rate; type=percent; required; default=6; min=0; max=100
- paymentsPerYear: Payments per year; type=number; required; default=12; min=1; max=365
- years: Loan term in years; type=number; required; default=5; min=0.01; max=100

## Outputs
- firstPayment: First payment; format=currency; primary
- lastPayment: Last payment; format=currency
- principalPerPayment: Principal per payment; format=currency
- totalInterest: Total interest; format=currency
- totalPaid: Total paid; format=currency
- paymentCount: Number of payments; format=integer

## Formula
principal payment = original principal ÷ number of payments; interest = opening balance × periodic rate

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