Mortgage Amortization Calculator

View a detailed amortization schedule showing how each payment splits between principal and interest

Monthly Payment
$2,023
fixed for 30 years
Total Interest
$408,142
over 30 years
Total Cost
$728,142
principal + interest
Interest-to-Loan Ratio
127.5%
of loan amount
Loan Details
$320,000
6.5%
%
30 years
yrs
Loan Summary
Loan Amount$320,000
Monthly Payment$2,022.62
Number of Payments360
Total Principal$320,000
Total Interest$408,142
Total of All Payments$728,142
Balance Over Time
Remaining Balance
Principal Paid
Interest Paid
Amortization Schedule

Month-by-month payment breakdown

MonthPaymentPrincipalInterestCum. InterestBalance
Jul 2026(#1)$2,023$289$1,733$1,733$319,711
Aug 2026(#2)$2,023$291$1,732$3,465$319,420
Sep 2026(#3)$2,023$292$1,730$5,195$319,127
Oct 2026(#4)$2,023$294$1,729$6,924$318,833
Nov 2026(#5)$2,023$296$1,727$8,651$318,538
Dec 2026(#6)$2,023$297$1,725$10,376$318,241
Jan 2027(#7)$2,023$299$1,724$12,100$317,942
Feb 2027(#8)$2,023$300$1,722$13,822$317,641
Mar 2027(#9)$2,023$302$1,721$15,543$317,339
Apr 2027(#10)$2,023$304$1,719$17,262$317,036
May 2027(#11)$2,023$305$1,717$18,979$316,730
Jun 2027(#12)$2,023$307$1,716$20,695$316,423
Jul 2027(#13)$2,023$309$1,714$22,409$316,115
Aug 2027(#14)$2,023$310$1,712$24,121$315,804
Sep 2027(#15)$2,023$312$1,711$25,832$315,492
Oct 2027(#16)$2,023$314$1,709$27,540$315,179
Nov 2027(#17)$2,023$315$1,707$29,248$314,863
Dec 2027(#18)$2,023$317$1,706$30,953$314,546
Jan 2028(#19)$2,023$319$1,704$32,657$314,227
Feb 2028(#20)$2,023$321$1,702$34,359$313,907
Mar 2028(#21)$2,023$322$1,700$36,059$313,584
Apr 2028(#22)$2,023$324$1,699$37,758$313,260
May 2028(#23)$2,023$326$1,697$39,455$312,935
Jun 2028(#24)$2,023$328$1,695$41,150$312,607

How the Mortgage Amortization Calculator works

Amortization is the schedule that retires a loan with equal payments: each month's payment first covers interest on the remaining balance, and the rest reduces principal. This calculator lays out that schedule month by month — payment, principal, interest, and remaining balance — for the full term.

Watching the schedule makes mortgage decisions concrete: you can see why extra principal payments early in the loan save the most interest, and exactly when your loan crosses from mostly-interest to mostly-principal.

Tips to get the most out of it

  • The interest portion each month is simply the remaining balance × the monthly rate — reduce the balance and every future month gets cheaper.
  • Use the schedule to find your loan's crossover month, when principal first exceeds interest in a payment.
  • Lenders must apply properly designated extra payments to principal — check statements after your first extra payment.

Frequently asked questions

Why is so much of my early mortgage payment interest?

Interest is charged on the outstanding balance, which is at its largest at the start. With a big balance and a fixed payment, interest consumes most of the payment until the balance meaningfully declines. That's a property of the math, not a lender trick — though it is why early extra payments are so powerful.

What is a mortgage recast?

After a large lump-sum principal payment, some lenders will re-amortize the remaining balance over the remaining term, lowering the required monthly payment without refinancing. It usually costs a small fee and keeps your existing rate — useful when rates have risen since you got the loan.

Do biweekly payments really pay a mortgage off faster?

Yes — paying half the monthly amount every two weeks results in 26 half-payments, i.e., 13 full payments a year instead of 12. That one extra annual payment typically cuts 4–6 years and a large chunk of interest from a 30-year loan.

Does an extra payment change my required monthly payment?

No. Extra principal shortens the loan and reduces total interest, but the required payment stays the same (unless you recast or refinance). You'll simply reach a zero balance months or years ahead of schedule.

From the Knowledge Base

How Mortgage Amortization Works (Why Your First Payment Is 86% Interest)

Your mortgage payment never changes, but where it goes changes completely. Understanding amortization is the key to saving thousands on any loan.

Read the guide