How it works
View the complete amortization schedule for your mortgage.
Input query strings and outputs
Use an input name in this page’s URL as ?name=value, and join additional inputs with &. Portable shared links may instead use the compact ?ac= state parameter.
Input query strings
3-
?loanAmount=Loan Amount ($)Number · Optional · Default: 300,000
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?interestRate=Interest Rate (%)Number · Optional · Default: 4.5
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?loanTerm=Loan Term (Years)Number · Optional · Default: 30
Outputs
4-
scheduledPaymentScheduled paymentCurrency · Primary output
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totalInterestTotal interestCurrency
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rowCountPayment countNumber
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lastBalanceFinal balanceCurrency
result contains the calculator’s complete rendered result area, including its visible result cards, tables, charts, and messages.
View your full 30-year payment schedule
Description
The Mortgage Amortization Calculator provides a detailed, month-by-month roadmap of your loan repayment. While a standard mortgage payment stays the same every month, the “mix” of that payment changes over time. Early on, most of your money goes to the bank (interest); later, most goes to your home equity (principal). This tool reveals exactly when that “tipping point” occurs.
Inputs
- Loan Amount: The total principal balance you are borrowing ($).
- Interest Rate: The annual interest rate for the loan (%).
- Loan Term: The number of years to repay the loan (e.g., 15, 20, 30).
Outputs
- Amortization Schedule: A comprehensive table showing for every month:
- Payment: Your fixed monthly installment.
- Principal: How much your debt decreases this month ($).
- Interest: The cost of borrowing paid to the lender this month ($).
- Balance: The remaining debt after the payment is made ($).
Chart
- N/A: This tool provides a detailed numeric table of all future payments.
“Good to Know”
- The Tipping Point: In a 30-year mortgage at 7%, you often don’t start paying more principal than interest until Year 19!
- Front-Loaded Interest: Because interest is calculated on your current balance, lenders receive the majority of their profit in the first decade of the loan.
- Check the “Balance” column at the 5 or 10-year mark to see how much you would still owe if you decided to sell or refinance.
Examples
Example 1: Standard $300k Loan
- Input:
- Amount: $300,000
- Rate: 4.5%, Term: 30 Years
- Output:
- Monthly: $1,520.06
- Month 1: $395 Principal / $1,125 Interest
- Month 360: $1,514 Principal / $6 Interest
Example 2: 15-Year Savings
- Input:
- Term: 15 Years
- Output:
- Shows how a much higher monthly payment results in drastically less interest paid over the life of the loan.
Example 3: Small Principal Increase
- Input:
- Interest Rate: 7%
- Output:
- Highlights how higher rates “eat” into your early principal payments, making it take longer to build equity.