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📅 Amortization Calculator

See your full amortization schedule: balance at each year milestone, interest vs principal breakdown, and the impact of extra monthly payments.

📍 Property Address (optional)
InputsYour Numbers
Loan Details
Purchase Price?
$
Down Payment %?
%
Interest Rate %?
%
Loan Term (years)?
Extra Payments
Extra Monthly Payment?
$
Extra Annual Payment?
$
As-Is AnalysisCurrent
Enter values to see results
Monthly Payment
--
P&I only
Total Interest
--
standard schedule
Loan Amount
--
price minus down
Payoff Date
--
standard schedule
Standard Schedule Milestones
Year 1: Balance--
Year 5: Balance--
Year 10: Balance--
Year 15: Balance--
Year 30: Balance$0
Interest vs Principal Over Time
Year 1 Interest Paid--
Year 1 Principal Paid--
Year 10 Interest Paid--
Total Interest (life of loan)--
Pro FormaAfter Plan
Enter pro forma values
New Payoff Date
--
with extra payments
Months Saved
--
paid off early
Interest Saved
--
total savings
Extra Monthly Cost
--
per month added
Accelerated Payoff Summary
Standard Payoff--
Accelerated Payoff--
Time Saved--
Standard Total Interest--
Interest Saved--

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1
Enter Your Loan
Input price, down payment, rate, and term. The calculator shows your monthly P&I and full schedule milestones.
2
See Balance Milestones
Check your balance at years 1, 5, 10, 15, and 30. In a 30-year loan at 7.5%, after 5 years you have only paid off about 4% of the original loan balance.
3
Understand Interest Front-Loading
In early years, almost all of your payment is interest. Year 1 on a 7.5% loan: about 90% of each payment goes to interest. This reverses in the final years.
4
Try Extra Monthly Payments
Enter $200-500/month extra. The pro forma shows how many months you cut off the loan and how much total interest you save. The results are often dramatic.
5
Compare 15-Year vs 30-Year
Change the term to 15 and compare. 15-year has a higher payment but saves hundreds of thousands in interest and builds equity twice as fast.
6
Use Extra Annual Payment
Enter an annual lump sum (tax refund, bonus). Even one extra payment per year significantly accelerates payoff and reduces total interest cost.

Every mortgage follows the same amortization schedule: early payments are mostly interest, late payments are mostly principal. This is not intuitive but has major implications for real estate investing.


In a 30-year mortgage at 7.5%, after 10 years (one-third of the term), you have only paid off about 13% of the original loan balance. The bank collects most of its interest in the early years -- this is why refinancing repeatedly can actually cost more than staying put.


Extra payments are extraordinarily powerful because they directly reduce principal, which reduces the interest charged on all future payments. Adding $200/month to a $256K loan at 7.5% cuts the payoff by about 6 years and saves roughly $89K in interest.

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