Remaining Mortgage Term Calculator: How Many Years Are Left on Your Loan

A fixed-rate mortgage is a simple machine. Each month the servicer charges one month of interest on the balance (the annual rate divided by 12, times what you owe), takes it out of your payment, and subtracts whatever is left from the principal. Repeat until the balance reaches zero. Because the rule never changes, the starting balance, the rate and the payment completely determine how many repetitions it takes.

That is why you do not need the original loan paperwork to find your payoff date. Two very different histories — a 30-year loan that is 18 years in, or a 15-year loan someone refinanced into three years ago — produce the same remaining term if today's balance, rate and payment are the same.

Two cautions. First, use the principal-and-interest portion only. If your servicer collects escrow for property taxes and insurance, that money passes through to the county and the insurer and never touches the balance; the taxes-and-insurance version of the schedule shows how the two are separated. Second, the method assumes a fixed rate. On an adjustable loan, the result is only valid until the next rate change.

Federal servicing rules require most borrowers to get a written statement every billing cycle. According to the Consumer Financial Protection Bureau's summary of what your mortgage servicer must comply with (read October 2026), the statement must show the current payment amount and how it is split among principal, interest and escrow; a payment history; and, under “other information,” the principal amount you currently owe and the interest rate, plus the next date the rate can change if it is adjustable. There are two exceptions the CFPB names: borrowers with a coupon book, where the coupons stand in for statements, and loans held by a small servicer.

Notice what is not on that list: the number of payments remaining or a projected payoff date. Some servicers print a maturity date, but that is the contractual end date from the note, and it does not move when you prepay. So the inputs come from three places on the statement:

• Balance: the outstanding or unpaid principal balance. Do not use a “payoff amount” quote; that figure adds accrued interest and any fees up to a specific date.
• Rate: the interest rate line (the note rate, not the APR from your closing documents).
• Payment: the principal plus interest from the payment breakdown. Add the two lines together and leave escrow out.

If the statement shows a payment that already went through this month, use the balance after it was applied, and count the result as payments starting next month.

The standard payment formula is M = P·r(1+r)ⁿ / ((1+r)ⁿ − 1), where P is the balance, r the monthly rate and n the number of payments. Rearranged to solve for n, it becomes:

n = −ln(1 − r·B / P) ÷ ln(1 + r)

Here B is the current balance and P the monthly payment. Working the example with B = $178,000, a 6.5% rate and P = $1,826.68:

1. Monthly rate: r = 0.065 ÷ 12 = 0.0054167.
2. One month of interest: r × B = $964.17. The payment exceeds this, so the loan can pay off.
3. Ratio: r·B / P = 964.17 ÷ 1,826.68 = 0.527825.
4. Numerator: −ln(1 − 0.527825) = −ln(0.472175) = 0.750405.
5. Denominator: ln(1.0054167) = 0.005402.
6. n = 0.750405 ÷ 0.005402 = 138.91 months.

Step two is not a formality. The term r·B / P is the share of your payment that goes to interest this month. If it reaches 1, the logarithm is undefined, which is the algebra telling you the payment never gets ahead of the interest. The calculator reports that case as “payment does not cover interest” instead of returning a number.

In a spreadsheet, Excel's NPER function (Microsoft documentation, read October 2026) does the same rearrangement: =NPER(0.065/12, -1826.68, 178000) returns 138.91. The payment goes in as a negative number because it is money leaving you. The Excel amortization guide builds the full row-by-row version, and the amortization formula page derives the payment equation this rearrangement starts from.

A fraction of a payment is not something a servicer bills. The 0.91 means the final installment is smaller than usual. Running the same loan month by month, with interest rounded to the cent each month as a servicer would, the balance after payment 138 is $1,655.80. Payment 139 is that balance plus one month of interest: $1,664.77, instead of the usual $1,826.68.

So the honest answer is 139 payments: 138 full ones and a short last one. That equals 11 years and 7 months. The month-by-month run also gives the interest still to be paid, $75,747, which the closed-form n cannot tell you directly.

The calculator does both on every input change. It reports the formula's fractional n and the simulated count side by side, and the simulation supplies the final payment, the interest total and the payoff month.

One cross-check for the example: the original 30-year schedule had 360 payments, 221 have been made, and 360 − 221 = 139. The statement and the original schedule agree, because this borrower has never paid extra. That agreement is the exception, not the rule, as the next sections show.

To see how sensitive the remaining term is, the table below holds the rate at 7.40%, the 30-year fixed average in Freddie Mac's Primary Mortgage Market Survey for the week of October 15, 2026 (read October 2026). It then varies the balance and the monthly principal-and-interest payment. Each cell shows time remaining and the interest still to pay.

Inputs: fixed 7.40% rate, payments starting next month, no extra principal. Computed by this site's month-by-month amortization formula on 2026-10-19.

The pattern to notice is how sharply the term stretches as the payment approaches the interest charge. On a $300,000 balance, $2,000 is only $150 above the first month's interest of $1,850.00, so principal falls slowly and the loan runs 35 years and 2 months. Raising that payment by $500 removes almost 17 years. On a $150,000 balance, the same $500 step from $2,000 to $2,500 removes 2 years and 1 month, because that loan was already well clear of its interest charge.

The two “does not cover interest” cells are not hypothetical curiosities. Interest-only periods, payment-option loans and some modified loans can leave a borrower paying less than the full interest. In those cases the balance stays flat or grows; the interest-only calculator models the first of these.

Two borrowers can owe the same amount and pay the same amount each month and still finish years apart, because the rate decides how much of each payment is consumed by interest. Here a $200,000 balance is repaid at $1,800 a month under six rates. The first four are Freddie Mac PMMS averages from the October 15, 2026 release and the same week a year earlier (read October 2026); the last two are round illustrative rates.

Inputs: $200,000 balance, $1,800 monthly principal and interest, fixed rate, no extra principal. Computed by this site's amortization formula on 2026-10-19.

The gap between 7.40% and 3.00% is 4 years and 9 months of payments and $103,802 of interest, from the rate alone. This is also why a refinance changes the remaining term even when you keep the payment roughly where it was. If you are weighing one, the refinance amortization calculator compares the old and new schedules directly.

Once you know the remaining term, the natural next question is how much faster you could finish. Back to the worked example: $178,000 at 6.5%, $1,826.68 a month, with a fixed extra amount added to every payment from next month.

Inputs: $178,000 balance, 6.5% fixed, $1,826.68 principal and interest plus the extra shown. Computed by this site's month-by-month amortization formula on 2026-10-19.

The first $100 removes 10 payments. Going from $500 to $1,000 extra removes 22 more, so each additional $100 buys fewer months as the loan gets shorter.

Extra money only shortens the term if the servicer applies it to principal. Fannie Mae's Selling Guide section on principal curtailments (read October 2026) sets the rules for how servicers of its loans handle them; in practice, use the portal's “additional principal” field and confirm the balance on the next statement fell by the full extra amount. For lump sums and mixed plans, the extra-payments calculator handles one-time and recurring amounts together.

The example above lined up neatly with the original 360-payment schedule. Most real loans do not, and a remaining mortgage term calculator that uses today's balance is the reason to trust the statement over the closing paperwork. Four common causes push the two apart.

Past extra payments. Suppose the same borrower had prepaid along the way and now owes $160,000 instead of $178,000, still at 6.5% and $1,826.68. The remaining term drops to 120 payments (10 years exactly) and the interest still to pay to $57,532. The original schedule would still say 139.

Missed or partial payments. If the balance is $195,000 at the same rate and payment, 160 payments remain (13 years and 4 months, $96,924 of interest).

A recast. After a lump-sum payment, a recast lowers the monthly payment and keeps the original maturity date. The remaining term therefore stays close to what the note says, while the payment changes. Run the recast calculator first, then enter the new payment here to confirm the count.

A loan modification. The CFPB describes a mortgage loan modification (read October 2026) as a change in your loan terms that may extend the number of years to repay, reduce the interest rate, and/or forbear or reduce principal. Any of those resets all three inputs. Use the post-modification statement, and ask the servicer whether any forborne principal is due as a lump sum at the end, because the formula here only counts the regular payments.

A common way to ask this question in a search box is “my initial mortgage was $289,000 and I now owe $178,000 — what percentage have I paid off?” The arithmetic is short: $289,000 − $178,000 = $111,000 repaid, and $111,000 ÷ $289,000 = 38.4% of the original principal.

The surprise is what that percentage hides. On the 6.5% schedule, reaching that balance took 221 of 360 payments, which is 61.4% of the term. The borrower has paid $403,696.28 in total so far, and $292,771.07 of it went to interest. Early payments are mostly interest, as the 30-year amortization schedule shows year by year.

The good news runs the other way. Because the balance is now smaller, more of each payment goes to principal every month. On a $178,000 balance, interest takes $964.17 of the $1,826.68 payment, about 53%, and that share shrinks every month. The remaining 139 of 360 payments, 38.6% of the timeline, will retire the other 61.6% of the principal.

The output is a projection that holds only while its assumptions do.

• Adjustable rates. A reset can change both the payment and the payoff date. Re-run the numbers after each change; the statement shows the next change date.
• Daily-interest loans. If your note charges interest by the day, the payment date moves the balance slightly, so expect small differences from a monthly model.
• Biweekly plans. Paying half the payment every two weeks adds the equivalent of one extra monthly payment a year, but only if the servicer posts each half as it arrives. The biweekly calculator models that schedule.
• Escrow shortages. A higher escrow bill raises the total payment but does not touch the principal-and-interest portion, so it does not change the remaining term.

For a full row-by-row view of a loan from its first payment, the mortgage amortization calculator on the homepage generates the complete schedule; the remaining mortgage term calculator on this page is the shortcut when all you have is today's statement.