{"product_id":"mortgage-amortization-extra-payment-calculator","title":"Mortgage Amortization \u0026 Extra Payment Calculator","description":"\u003cdiv style=\"color:#101820!important;font-size:24px!important;line-height:1.7;\"\u003e\n\u003cp style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003e\u003cstrong\u003eSee how much of your mortgage payment reduces your balance—and what extra principal payments could change.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003eThis mortgage amortization calculator with extra payments helps homebuyers and homeowners compare a standard fixed-rate repayment schedule with additional monthly principal. Review principal versus interest, estimated interest savings, and the payoff timeline using your own loan assumptions.\u003c\/p\u003e\n\u003cp style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003e\u003cstrong\u003eOne-time digital purchase. The working calculator is delivered as a downloadable HTML file.\u003c\/strong\u003e\u003c\/p\u003e\n\u003csection id=\"rr-actual-preview\"\u003e\u003ch2 style=\"font-size:32px!important;line-height:1.3!important;color:#12243a!important;margin:28px 0 16px;\"\u003eSee the actual planner\u003c\/h2\u003e\n\u003cp style=\"font-size:24px!important;line-height:1.65!important;color:#12243a!important;margin:0 0 16px;\"\u003eThis desktop screen shows the Mortgage Payoff \u0026amp; Amortization Planner included with this product. The loan details are fictional examples.\u003c\/p\u003e\n\u003cfigure style=\"margin:20px 0;\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0783\/9806\/2639\/files\/roof-ratio-mortgage-actual-preview.png?v=1791170656\" style=\"color:#174f72!important;text-decoration:underline;overflow-wrap:anywhere;\"\u003e\u003cimg alt=\"Actual mortgage planner screen showing a fictional $300,000 loan at 6.5%, with a $1,896.20 regular monthly payment.\" height=\"1000\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0783\/9806\/2639\/files\/roof-ratio-mortgage-actual-preview.png?v=1791170656\" style=\"display:block;width:100%;max-width:1200px;height:auto;border:1px solid #cfd6df;border-radius:10px;\" width=\"1200\"\u003e\u003c\/a\u003e\u003cfigcaption style=\"font-size:20px;line-height:1.5;margin-top:12px;color:#12243a;\"\u003eActual desktop interface. Select the image to view it at full size. This is a screen preview; the working file is delivered after purchase.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003cp style=\"font-size:24px!important;line-height:1.65!important;color:#12243a!important;margin:0 0 16px;\"\u003eThe regular payment shown separates principal from interest. The toolbar also shows the planner's save, print and backup controls.\u003c\/p\u003e\u003c\/section\u003e\u003ch2 style=\"font-size:32px!important;line-height:1.3;color:#101820!important;font-weight:700;margin:32px 0 16px;\"\u003eKey features and metrics calculated\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003eMonthly principal-and-interest payment\u003c\/li\u003e\n\u003cli style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003eFirst-payment principal versus interest breakdown\u003c\/li\u003e\n\u003cli style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003eOptional property tax, insurance, PMI and HOA estimates\u003c\/li\u003e\n\u003cli style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003eInterest saved and time saved with extra monthly principal\u003c\/li\u003e\n\u003cli style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003eRegular and accelerated payoff dates\u003c\/li\u003e\n\u003cli style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003eInteractive loan-balance chart\u003c\/li\u003e\n\u003cli style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003eMonthly and yearly amortization schedules\u003c\/li\u003e\n\u003cli style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003ePrintable PDF view and downloadable CSV schedule\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size:32px!important;line-height:1.3;color:#101820!important;font-weight:700;margin:32px 0 16px;\"\u003ePreview: how extra payments change the numbers\u003c\/h2\u003e\n\u003cp style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003eFor a fictional $300,000 loan at a fixed 6.5% annual interest rate over 30 years, the monthly principal-and-interest payment is approximately \u003cstrong\u003e$1,896.20\u003c\/strong\u003e. The first payment includes $1,625 in interest and about $271.20 toward principal.\u003c\/p\u003e\n\u003cp style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003eIn a monthly amortization model, paying another $100 toward principal with every payment from month one reduces the payoff time to about \u003cstrong\u003e26 years\u003c\/strong\u003e and saves approximately \u003cstrong\u003e$60,995 in interest\u003c\/strong\u003e. Taxes, insurance, PMI, HOA charges, fees, and penalties are excluded. Your results depend on your loan and how payments are applied.\u003c\/p\u003e\n\u003cp style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003eThis is a worked illustration, not a live calculator. \u003ca href=\"\/blogs\/news\/where-your-mortgage-payment-really-goes-and-how-100-a-month-can-save-you-60-000\" style=\"color:#123b60!important;font-size:24px!important;font-weight:600;text-decoration:underline;overflow-wrap:anywhere;\"\u003eSee the complete amortization and extra-payment walkthrough\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2 style=\"font-size:32px!important;line-height:1.3;color:#101820!important;font-weight:700;margin:32px 0 16px;\"\u003eCompatibility and download format\u003c\/h2\u003e\n\u003cp style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003eThe working calculator is an HTML file designed to run in a browser. No Excel, Google Sheets or Numbers software is required. Opening downloaded HTML and saving files varies by device; some phone file previews do not run interactive controls. Review our \u003ca href=\"\/pages\/digital-downloads#device-guide\"\u003edevice guide\u003c\/a\u003e and ask us before buying if you will use only a phone or tablet. The exported CSV schedule opens in compatible spreadsheet software.\u003c\/p\u003e\n\u003cp style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003eYour entries remain in your browser and are not uploaded. Print the results, save a PDF through your browser’s print options, or download a CSV schedule. Printing and file-opening steps vary by device.\u003c\/p\u003e\n\u003ch2 style=\"font-size:32px!important;line-height:1.3;color:#101820!important;font-weight:700;margin:32px 0 16px;\"\u003eHow to use the calculator\u003c\/h2\u003e\n\u003col\u003e\n\u003cli style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003eEnter the loan amount, annual interest rate, term, and payment timing requested by the tool.\u003c\/li\u003e\n\u003cli style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003eReview the regular principal-and-interest payment and schedule. Keep taxes, insurance, PMI, and HOA estimates separate from the loan calculation.\u003c\/li\u003e\n\u003cli style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003eAdd an extra monthly principal amount and compare interest saved and the payoff timeline.\u003c\/li\u003e\n\u003cli style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003ePrint or export the schedule you want to keep.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2 style=\"font-size:32px!important;line-height:1.3;color:#101820!important;font-weight:700;margin:32px 0 16px;\"\u003eBefore you buy\u003c\/h2\u003e\n\u003cp style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003eThis calculator models fixed-rate monthly amortization. It does not reproduce every lender’s daily-interest, adjustable-rate, interest-only, or balloon-loan rules. Check your loan documents and confirm with your servicer how extra payments will be applied.\u003c\/p\u003e\n\u003cp style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003e\u003ca href=\"\/pages\/digital-downloads\" style=\"color:#123b60!important;font-size:24px!important;font-weight:600;text-decoration:underline;overflow-wrap:anywhere;\"\u003eHow digital downloads work\u003c\/a\u003e · \u003ca href=\"\/policies\/refund-policy\" style=\"color:#123b60!important;font-size:24px!important;font-weight:600;text-decoration:underline;overflow-wrap:anywhere;\"\u003eCurrent refund policy\u003c\/a\u003e. Questions? Email \u003ca href=\"mailto:marchelle@roofandratio.com\" style=\"color:#123b60!important;font-size:24px!important;font-weight:600;text-decoration:underline;overflow-wrap:anywhere;\"\u003emarchelle@roofandratio.com\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 16px;\"\u003e\u003cem\u003eEducational planning tool only. Results are estimates and are not a loan quote, appraisal, tax calculation, or financial advice.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv style=\"max-width:960px;margin:0 auto;color:#101820;font-size:24px;line-height:1.7;\"\u003e\u003csection id=\"rr-product-questions\"\u003e\u003ch2 style=\"font-size:32px!important;line-height:1.3;color:#101820!important;font-weight:700;margin:32px 0 16px;\"\u003eQuestions about this mortgage calculator\u003c\/h2\u003e\n\u003ch3 style=\"font-size:28px!important;line-height:1.3;color:#101820!important;font-weight:700;margin:28px 0 16px;\"\u003eWho is this tool for?\u003c\/h3\u003e\n\u003cp style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 18px;\"\u003eHomebuyers and homeowners comparing monthly fixed-rate mortgage scenarios, principal and interest, and extra monthly principal payments.\u003c\/p\u003e\n\u003ch3 style=\"font-size:28px!important;line-height:1.3;color:#101820!important;font-weight:700;margin:28px 0 16px;\"\u003eDoes it make payments to my lender?\u003c\/h3\u003e\n\u003cp style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 18px;\"\u003eNo. It is a downloadable planning calculator. Arrange actual payments with your servicer and confirm how additional principal will be applied.\u003c\/p\u003e\n\u003ch3 style=\"font-size:28px!important;line-height:1.3;color:#101820!important;font-weight:700;margin:28px 0 16px;\"\u003eCan I see the example before buying?\u003c\/h3\u003e\n\u003cp style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 18px;\"\u003eYes. The \u003ca href=\"#rr-actual-preview\"\u003eactual desktop screen preview\u003c\/a\u003e shows the planner interface, and the \u003ca href=\"\/blogs\/news\/where-your-mortgage-payment-really-goes-and-how-100-a-month-can-save-you-60-000\"\u003epublic amortization guide\u003c\/a\u003e explains a fictional loan example. The working calculator is delivered after purchase.\u003c\/p\u003e\n\u003cp style=\"font-size:24px!important;line-height:1.7;color:#101820!important;margin:0 0 18px;\"\u003eCreated by \u003ca href=\"\/pages\/about-marchelle\" style=\"color:#123b60!important;font-size:24px!important;font-weight:600;text-decoration:underline;overflow-wrap:anywhere;\"\u003eMarchelle Cook, founder of Roof \u0026amp; Ratio\u003c\/a\u003e. \u003ca href=\"\/pages\/about-roof-ratio#how-we-explain-the-numbers\" style=\"color:#123b60!important;font-size:24px!important;font-weight:600;text-decoration:underline;overflow-wrap:anywhere;\"\u003eHow we explain the numbers\u003c\/a\u003e.\u003c\/p\u003e\u003c\/section\u003e\u003c\/div\u003e","brand":"Roof \u0026 Ratio","offers":[{"title":"Interactive Calculator","offer_id":46261275787311,"sku":"RR-MORT-AMORT-001","price":7.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/9806\/2639\/files\/roof-ratio-mortgage-payoff-planner-paid-v2_3ad682db-135a-4a1d-9a99-a9190511899c.png?v=1790814423","url":"https:\/\/roofandratio.com\/products\/mortgage-amortization-extra-payment-calculator","provider":"Roof \u0026 Ratio","version":"1.0","type":"link"}