Own Your Home Sooner. Pay Less Interest.
A complete planning system that shows you exactly how your mortgage amortizes — and exactly how much extra payments can save you in time and interest.
One-time payment — lifetime access & updates
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Build your financial toolkit — save up to 40% →This spreadsheet is for anyone with a mortgage — or about to take one out — who wants full visibility into how their loan amortizes over time. Whether you're comparing loan offers, deciding if refinancing makes sense, or exploring whether extra payments are worth it, this gives you the exact numbers.
It's especially valuable for homeowners considering bi-weekly or extra monthly payments, anyone comparing 15-year vs 30-year terms, and first-time buyers who want to understand exactly where their monthly payment goes.
On the Loan Setup sheet, enter your loan amount (the original principal borrowed), your annual interest rate, your loan term in years (1 to 30) and your start date. The spreadsheet automatically calculates your fixed monthly payment and builds the full amortization schedule from these numbers.
The schedule breaks down every single payment over the life of the loan — showing exactly how much goes to principal and how much goes to interest each month, along with your running remaining balance. Early in the loan, a larger share of each payment goes toward interest; this shifts toward principal as the balance decreases.
Enter an optional extra monthly payment on the Loan Setup sheet. The spreadsheet recalculates your entire payoff timeline instantly, showing your new payoff date, the total interest saved, and how many months or years you cut off the loan.
On the Dashboard, the loan-balance chart shows how your remaining balance declines over time, and the principal-vs-interest chart shows how much of what you pay each year goes to principal and how much to interest. Use the Loan Comparison sheet to put two loan scenarios side by side.
Compare the interest saved from extra payments against what that money could earn if invested elsewhere instead. As a general rule, if your mortgage rate is higher than your expected investment return, paying down the mortgage faster tends to be the more conservative choice — but consider your own risk tolerance, liquidity needs, and tax situation.
Even modest extra payments compound meaningfully over a 30-year term because they reduce principal early, which reduces all future interest calculated on that principal. Common strategies include rounding payments up, making one extra payment per year, or switching to bi-weekly payments (which effectively adds one extra monthly payment annually). Use this spreadsheet to test any strategy before committing to it.
Any term from 1 to 30 years — 10, 15, 20, 30 or a custom number of years. Simply enter your loan amount, rate, and term, and the full schedule recalculates instantly.
Bi-weekly payments add up to roughly one extra monthly payment per year. Divide that extra amount by 12 and enter it as the Extra Monthly Payment on the Loan Setup sheet to see the approximate impact on your payoff date and total interest.
Yes. Upload the .xlsx file to Google Drive and open it with Google Sheets. All formulas, schedules, and charts are fully compatible at no extra cost.
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All spreadsheets work with Microsoft Excel 2016+ and Google Sheets. No special software required.
Open your planner on a laptop, tablet or phone — in Excel or Google Sheets, wherever you are.
Buy once, use forever. All future updates are included at no extra cost.