Amortization Schedule Calculator

Amortization Schedule Calculator

An amortization schedule is the month-by-month breakdown of every payment on a fixed-rate loan. Each row shows the payment number, the date, the interest charged that month, the principal paid, and the remaining balance. The calculator above generates the full schedule for any loan amount, interest rate, and term, then regenerates it the moment you add extra payments so you can see exactly how each dollar changes the payoff timeline.

The math behind each row is straightforward. The monthly payment itself comes from the standard amortization formula: M = P × (r ÷ 12) ÷ (1 − (1 + r ÷ 12)⁻ⁿ), where P is the loan amount, r is the annual rate as a decimal, and n is the term in months. For the default loan that yields a payment of $1,580.17. Each month, interest is computed as balance × (r ÷ 12), and the rest of the payment reduces principal. The final month pays the exact remaining balance plus that month's interest, so the schedule always ends at zero.

Amortization Schedule with Extra Payments

An amortization schedule with extra payments shows how the same loan shortens when you pay more than the required minimum each month. Extra payments are applied directly to principal, which means every extra dollar reduces the balance that future interest is calculated on. Because interest is computed as balance times rate divided by 12, paying down an extra dollar of principal removes one month of interest on that dollar for every remaining month of the loan. On a 6.50% loan, that is roughly 6.5 cents per year per dollar, compounding across thousands of dollars and hundreds of months.

One practical step matters more than the math: confirm with your servicer that extra payments are applied to principal, not pushed forward as an advance on next month's due date. Some servicers default to advancing the due date, which holds your balance steady and saves no interest. Instruct them in writing or in your online account settings to apply anything above the regular payment as a principal reduction.

Loan Amortization Calculator with Extra Payments

The calculator above accepts three kinds of extra payments, and each affects the balance differently. An extra monthly payment is added to every payment from month one forward, so it compounds the longest and saves the most interest per dollar. An extra annual payment is applied once every 12 months, which is useful if you receive a yearly bonus, tax refund, or commission check you want to direct at the loan. A one-time payment is a single lump sum applied in the month you specify, useful for an inheritance, sale proceeds, or a single windfall.

A lump sum applied early saves more than the same total spread across monthly extras, because the entire amount stops accruing interest from that month forward. A $6,000 lump sum in month 1 saves more interest than adding $100per month for five years, because the entire amount stops accruing interest immediately instead of arriving gradually over 60 months. The calculator's comparison block shows the exact months and interest saved for whatever combination of extras you enter.

The schedule table itself is the page's core feature, not an afterthought. Every month is listed with its payment, extra, interest, principal, and running balance, grouped by year with a year-summary row showing the total interest and principal paid that year. Use the Expand All button to see every month at once, or click a single year to drill into its 12 rows. The year-summary view alone is enough to see how the interest share drops over time without scrolling through 360 individual rows.

How Much Interest Will I Pay on My Loan

Total interest on a fixed-rate loan is the sum of every month's interest charge across the full term. On the default $250,000 loan at 6.50% over 30 years, that sum is $318,861.26, which means you pay more in interest than the loan itself cost. That happens because the rate, applied to a high starting balance over 360 months, accrues faster than the payment reduces the principal in the early years.

The single most effective way to cut total interest is to shorten the term. The same $250,000 at 6.50% on a 15-year schedule has a monthly payment of $2,177.77 (versus $1,580.17 for 30 years) but total interest of only $141,998.12, a savings of $176,863.14. The shorter term costs more per month but less than half the interest, because the balance is retired twice as fast and interest has half as many months to accrue.

Printable Amortization Schedule

A printable amortization schedule is a paper copy of every payment on your loan, useful for keeping alongside your loan documents, sharing with a co-borrower or financial advisor, or reviewing the year-by-year interest total for tax planning. The Print Schedule button above opens a clean print view with no navigation, ads, or input controls. Every month prints in full, grouped by year, with the payment, extra, interest, principal, and running balance on each row.

When you review a printed schedule, check four things on at least the first and last rows. First, the payment number should run from 1 to the total month count with no gaps. Second, the date column should advance by one month per row, starting from your first payment date. Third, the interest plus principal on each row should equal the payment (plus any extra that month). Fourth, the running balance should start at the loan amount, decrease every month, and land on exactly zero in the final row. If any of those fail, the schedule does not match your loan terms.

The year-summary rows are the most useful part of a printed schedule for tax purposes. Mortgage interest is often deductible, and the year-summary row gives you the total interest paid in each calendar year without having to add up 12 monthly interest charges by hand. If you made extra payments, the extra column on the schedule shows exactly how much above the regular payment you paid each month, which is useful for tracking your payoff progress.

Extra Payment Loan Calculator

An extra payment loan calculator shows the precise time and interest savings from paying more than the required minimum. The calculator above is that tool: enter any combination of extra monthly, extra annual, and one-time payments, and the schedule regenerates instantly with a comparison block showing the baseline versus your plan, the months saved, and the interest saved.

The strategy that saves the most interest per dollar is to apply extra payments as principal reductions as early as possible. A dollar paid down in year one of a 30-year loan saves 30 years of interest on that dollar. The same dollar paid down in year 25 saves only 5 years. This is why a lump sum in the early years of a mortgage has an outsized effect, and why even a modest extra monthly payment started at the beginning of the loan can cut years off the term.

One caveat worth repeating: this calculator computes fixed-rate amortization math only. It does not model adjustable-rate mortgages, closing costs, escrow impounds for taxes and insurance, or private mortgage insurance. If your down payment is under 20%, PMI adds to your monthly cost until you reach 20% equity; see the PMI Calculator to estimate that separately. This page does not recommend any specific loan product or refinancing strategy; it only computes the math of paying off a fixed-rate loan on schedule or ahead of it.

Frequently Asked Questions

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Browse all tools on the Loan Calculators hub. If you are paying down a student loan and want a payoff-date view rather than a full schedule, the Student Loan Payoff Calculator computes your debt-free month from a fixed payment. For a vehicle loan, the Auto Loan Calculator handles trade-ins and sales tax. If your mortgage payment includes PMI, the PMI Calculator shows when it drops off, and if you are weighing a refinance, the Refinance Break-Even Calculator shows how many months it takes to recoup closing costs.