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Home Loan Amortization Calculator

Enter your loan amount, interest rate, and term to calculate monthly payments and view a detailed amortization schedule. Optionally add extra payments to see how they reduce interest and payoff time.
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Luis GonzalezCreated by Luis GonzalezLast updated:

How to Use This Calculator

  1. 1

    Enter Loan Amount

    Input the total home loan amount.

  2. 2

    Set Interest Rate

    Enter your annual mortgage interest rate.

  3. 3

    Choose Loan Term

    Select the repayment period (15, 20, or 30 years).

  4. 4

    Add Extra Payments (Optional)

    Include any additional monthly or annual payments to see their impact on the schedule.

  5. 5

    View the Schedule

    Review the month-by-month breakdown of principal, interest, and remaining balance.

Example Calculation

Generating an amortization schedule for a new home purchase.

Loan Amount

$340,000

Interest Rate

6.25%

Loan Term

30 years

Results

Monthly payment

$2,093. First payment breakdown: $1,771 interest / $322 principal. After 10 years: $280,400 remaining balance with $190,716 in interest paid. Total interest over 30 years: $413,527.

Tips

Focus on the Early Years

Extra payments in the first 5-10 years have the biggest impact because that is when the interest portion of each payment is highest.

Use the Schedule for Tax Planning

Your amortization schedule shows how much interest you pay each year, which helps you estimate your mortgage interest tax deduction.

Compare Different Scenarios

Generate schedules for different loan terms and rates to see exactly how each option affects your total cost and payoff timeline.

Unpacking Your Home Loan Amortization Schedule and Payments

The Home Loan Amortization Calculator helps you visualize how your mortgage payments break down into principal and interest over the life of the loan. For a $300,000 home loan at a 4% annual interest rate over 30 years, the calculator shows a fixed monthly payment of $1,432.25, with $215,609 in total interest over the life of the loan — a total cost of $515,609.

Why Understanding Your Amortization Schedule Matters

Understanding your amortization schedule reveals how much of each payment goes to interest versus building equity. For a $300,000 loan at 4% over 30 years, you will pay $215,609 in total interest — 72% of the original loan amount. This insight empowers you to explore strategies like extra payments, refinancing, or shorter terms to reduce that interest burden and build equity faster.

The Standard Amortization Formula for Home Loans

The fixed monthly payment for an amortizing loan is calculated with this formula:

monthly payment = (loan amount × monthly rate × (1 + monthly rate)^total payments) / ((1 + monthly rate)^total payments − 1)

Where monthly rate = annual interest rate / 12, and total payments = loan term in years × 12.

total interest = (monthly payment × total payments) − loan amount
💡 Want to accelerate your mortgage payoff? Our Bi-Weekly Mortgage Payment Calculator shows how switching to bi-weekly payments can save you interest and time.

Worked Example: 30-Year Mortgage Amortization

A homeowner has a $300,000 loan at 4% annual interest over 30 years, with no extra payments.

  1. Monthly interest rate: 4% / 12 = 0.003333
  2. Total payments: 30 × 12 = 360
  3. Monthly payment: Using the formula = $1,432.25
  4. First month breakdown:
    • Interest: $300,000 × 0.003333 = $1,000.00
    • Principal: $1,432.25 − $1,000.00 = $432.25
  5. Balance after month 1: $300,000 − $432.25 = $299,567.75
  6. Total interest paid: $1,432.25 × 360 − $300,000 = $215,609
  7. Total paid: $300,000 + $215,609 = $515,609

For every $1 borrowed, you pay $0.72 in interest over the full 30-year term.

💡 Comparing different loan options? Our Home Loan Comparison Calculator lets you evaluate two mortgage scenarios side by side.

The Impact of Interest Rates on Amortization

Interest rates profoundly impact total costs. On a $300,000, 30-year loan, a 4% rate results in $215,609 in total interest, while a 6% rate leads to $347,515 — a difference of $131,906. Even a half-percentage-point difference translates to tens of thousands over a 30-year term. In 2026, rates vary significantly by credit profile and market conditions, making rate comparison essential before committing to a mortgage.

Loan Term Comparison: 15-Year vs. 30-Year

Choosing between a 15-year and 30-year term involves a trade-off between monthly payment size and total interest. A $300,000 loan at 4% costs $99,431 in interest over 15 years (payment: $2,219/month) versus $215,609 over 30 years (payment: $1,432/month). The 30-year option costs $116,178 more in interest but has $787 lower monthly payments — a decision that depends on your cash flow and financial goals.

Frequently Asked Questions

What does a home loan amortization schedule show?

An amortization schedule shows the breakdown of each monthly payment into principal and interest for the entire loan term. It reveals how much of each payment reduces your balance and how much goes to interest, along with your remaining balance after each payment.

Why do I pay more interest at the beginning?

Interest is calculated on the outstanding balance. Since your balance is highest at the start, most of your early payments go toward interest. As you pay down the principal, less interest accrues and more of each payment goes toward the balance. This is standard amortization.

How can I use the amortization schedule to save money?

Review your schedule to see exactly how extra payments reduce your timeline and interest. Even small additional payments early in the loan have the greatest impact because they reduce the principal on which interest compounds for the remaining years.