10 Year Loan Calculator

What a 10 year loan is, and what it costs in 2026

A 10 year loan gives you 120 monthly payments to retire a balance. The term is far longer than a typical unsecured personal loan, which usually runs 2 to 7 years, so a true 120 month loan is most common when something secures it: a home improvement loan, a boat or RV note, equipment financing for a small business, or a debt consolidation plan stretched to keep the payment low. The long term has one clear appeal. It pushes the monthly payment down to a level a household budget can carry.

The rate you pay depends on the market and on your credit. The Federal Reserve's G.19 release for August 2026, published October 7, 2026, put the average rate on a 24 month personal loan at commercial banks at 11.90 percent and the average rate on credit card accounts assessed interest at 22.36 percent. Lenders generally price longer unsecured terms above short ones, because the money is at risk for more years, so a 10 year loan often carries a rate closer to card territory than to the 24 month average. The G.19 numbers are a floor to think against, not a quote.

That gap is why the term deserves a hard look before you sign. Stretching a consolidation from 5 years to 10 can cut the payment by more than a third, and it can also double or worse the interest you hand over. The sections below put numbers on both sides of that trade.

The 120 month payment formula

For an amount P borrowed at an annual rate APR for n months, the monthly rate is i = APR divided by 12, and the level payment is M = P times i(1+i)^n divided by ((1+i)^n minus 1). Total interest equals M times n minus P. At a 0 percent rate the formula collapses to P divided by n, because there is nothing to discount.

The payment is an annuity amount: it is the fixed figure whose value, discounted at the monthly rate across all 120 months, equals the amount borrowed. Interest is charged on the outstanding balance, so it is front-loaded. On a 25,000 dollar loan at 9.99 percent, the first payment includes 208.13 dollars of interest, which is 63 percent of the 330.24 dollar payment. By the final payment, interest is under 3 dollars.

Two numbers drive the result: the monthly rate i and the term n. Over 120 months the rate has a long runway to work on, which is why the interest total responds so sharply to small APR moves, and why the payment responds so sharply to term moves. Those two sensitivities are the whole story of the sections that follow.

The table traces the split at five checkpoints in the schedule. Interest falls every month while the principal share grows, so the balance drops slowly at first and then accelerates.

After five years, 15,546.39 dollars of the original 25,000 is still owed. That is the arithmetic that makes early overpayments worth more than late ones: the same 50 dollars applied in month 12 removes a balance that would have charged interest for 108 more months.

Worked example: 25,000 dollars at 9.99 percent for 120 months

Take a 25,000 dollar consolidation loan at 9.99 percent APR over 120 months. The monthly rate is 0.0999 divided by 12, or 0.008325, and (1+i) raised to the 120th power is 2.7044. The payment is 25,000 x 0.008325 x 2.7044 divided by 1.7044, which is 330.24 dollars a month.

Twelve times ten payments come to 39,628.61 dollars, so the decade of borrowing costs 14,628.61 dollars in interest, or 58.5 percent of the amount borrowed. You pay back about 1.59 dollars for every dollar you received. The first payment splits into 208.13 dollars of interest and 122.11 dollars of principal; the balance does not fall below 20,000 dollars until payment 37.

Put the same 25,000 dollars on a credit card at the G.19 average of 22.36 percent and the first month alone adds 465.83 dollars of interest, more than the whole 330.24 dollar payment. Clearing that balance over 120 months would take 522.88 dollars a month and cost 37,746.05 dollars in interest, 23,117.44 dollars more than the fixed loan. That comparison, not the payment size, is the real argument for consolidating card debt into an installment loan.

Worked example: 15,000 at 11.90 percent, and a 0 percent offer

Now take 15,000 dollars at 11.90 percent for 120 months, a rate near the G.19 average. The payment is 214.34 dollars a month, the 120 payments total 25,720.82 dollars, and the interest is 10,720.82 dollars, which is 71.5 percent of the amount borrowed. A borrower who takes 15,000 dollars at 7 percent instead would pay 174.16 a month and 5,899.53 in interest, so 4.9 points of APR cost 40.18 dollars a month and 4,821.30 dollars over the decade.

Contrast that with a 0 percent offer, such as an interest-free financing promotion. At 0 percent the payment on 15,000 dollars over 120 months is 208.33 dollars, the amount divided by 120, and the interest is zero. The payment is only 6 dollars a month below the 11.90 percent payment, yet the total cost differs by 10,720.82 dollars. Over long terms, the rate is nearly the whole price.

The lesson generalizes: at 120 months, every point of APR adds a large, fixed chunk to the total. Shopping a 12 percent quote down to 10 percent on a 25,000 dollar loan saves 3,396.06 dollars, which is more than most people negotiate away on the price of what they are financing.

What the term does: 5, 7, 10 and 15 years on the same 25,000

The table below holds the amount and rate fixed at 25,000 dollars and 9.99 percent and moves only the term. Read it as the two-sided trade: the payment falls as the term stretches, and the interest climbs faster than the payment falls.

Moving from 5 years to 10 cuts the payment by 200.81 dollars a month, which may be the difference between qualifying and not. It also adds 7,765.42 dollars of interest, more than doubling the cost of borrowing. Moving from 10 to 15 saves only 61.74 dollars a month but adds 8,701.09 dollars of interest, because by 120 months the payment is already close to the floor that the rate alone sets: at 9.99 percent, a 25,000 dollar balance generates about 208 dollars of interest in the first month no matter how the rest is scheduled.

A practical rule: pick the shortest term whose payment fits the budget with room to spare, then use the extra-principal option below to get the flexibility of the long term with something close to the cost of the short one.

What 50 dollars of extra principal a month does

Extra principal is the quiet counterweight to a long term. On the 25,000 dollar loan at 9.99 percent over 120 months, adding 50 dollars a month to the 330.24 dollar payment retires the balance in 96 payments instead of 120, which is 24 months, two full years, ahead of schedule, and cuts the interest from 14,628.61 dollars to 11,354.35 dollars, a saving of 3,274.26 dollars.

The arithmetic behind that saving is plain: the extra 50 dollars goes entirely to principal, so every dollar of it stops drawing 9.99 percent interest for the rest of the schedule. Early in the loan, an extra 50 dollars removes about 50 dollars of balance that would otherwise have sat there accruing interest for years.

Before you set this up, check the loan agreement for a prepayment penalty. Many consumer loans have none, but some auto and personal loans charge a fee if the balance is retired ahead of schedule, and a penalty can eat a 3,000 dollar saving alive. When there is no penalty, the combination of a long term for safety and steady extra principal for speed is the cheapest way to borrow with a margin for error.

The table repeats the run with larger extra payments on the same 25,000 dollar, 9.99 percent, 120 month loan.

Doubling the extra from 50 to 100 dollars saves another 2,043.49 dollars and 16 more months, so the return per dollar tapers as the payment grows. The taper is the reason a steady 50 dollars from the first month usually beats a single large lump sum made in year eight.

Sizing the loan from a payment you can afford

The calculator also runs in reverse. If you know the payment your budget can carry, you can solve for the amount it supports. At 9.99 percent over 120 months, a 300 dollar monthly payment supports a loan of 22,710.86 dollars. The same 300 dollars supports 25,837.91 dollars at 7 percent, but only 20,092.33 dollars at 13 percent, so your buying power over a decade swings by thousands of dollars with the rate you qualify for.

When you compare offers, compare APRs rather than note rates. The Consumer Financial Protection Bureau explains that the APR folds the interest rate and the lender's fees into one figure, which is why a 9.99 percent rate with a 5 percent origination fee can cost more than an 11 percent rate with no fee. On a long loan the fee is spread thin per year but the financed amount is large, so fee differences matter more on 120 months than on 24.

Leave headroom. A payment set at the exact edge of the budget survives until the first surprise bill. Lenders size approvals off gross income; only you can size the payment off what is left after rent, food and the things you already owe.

How to use this calculator

Enter the amount, the APR and the term in months, with 120 as the default for a 10 year loan. The results show the level payment, the total of all payments, the total interest and the interest as a share of the amount borrowed, plus how the first payment splits between interest and principal.

Two optional inputs extend the picture. Extra principal each month shows the earlier payoff date and the interest saved. The budget input runs the math in reverse and shows the loan amount a payment you name would support at the same rate and term. Change the term box to 60 or 84 to reproduce the term comparison in the table above.

What the calculator leaves out: variable rates that move after the loan is signed, lender fees (use the APR in the rate box to approximate them), escrow for taxes and insurance on secured loans, and any payment protection products a lender tries to add at closing. It is an estimator for planning, not a loan offer, and the figures on any actual note control.