Enter the balance, rate, term, and optional extra monthly payment. The calculator shows the modeled payment, interest, and payoff timeline.
Starting balance: $35,000. Modeled monthly payment: $389. Modeled total interest: $11,629.
Inputs: $35,000 balance, 6% annual rate fixed for 10 years, monthly payments, no extra payment.
Inputs changed: press Calculate to see the result.
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| Year | Interest paid | Remaining balance |
|---|---|---|
| Year 1 | $2,028 | $32,365 |
| Year 2 | $1,866 | $29,568 |
| Year 3 | $1,693 | $26,599 |
| Year 4 | $1,510 | $23,446 |
| Year 5 | $1,316 | $20,099 |
| Year 6 | $1,109 | $16,546 |
| Year 7 | $890 | $12,773 |
| Year 8 | $657 | $8,767 |
| Year 9 | $410 | $4,515 |
| Year 10 | $148 | $0 |
On the scheduled payment alone, the balance is repaid in 120 months (10 years), $46,629 in all: the $35,000 balance plus $11,629 of modeled interest.
In the first month the balance builds $175 of interest (balance × 6% ÷ 12), and $214 of the first $389 payment reduces the balance. Charged daily at 6% ÷ 365, the same balance builds $5.75 a day.
Both are model figures for the starting balance. A servicer’s actual accrual rules, such as its day count or when a payment posts, can differ.
In a fixed-rate amortizing model, paying extra reduces the balance earlier and can reduce future modeled interest. No extra payment is entered above, so the table uses $100 a month as an example.
| Scenario | Extra each month | Payoff time | Modeled total interest |
|---|---|---|---|
| Scheduled payment only | $0 | 120 months (10 years) | $11,629 |
| With extra payment | $100 | 89 months (7 years 5 months) | $8,441 |
For example, with $100 extra each month, modeled interest is $3,188 lower and the payoff is 31 months (2 years 7 months) shorter. Enter your own amount in Extra monthly payment above to run it on your figures.
Student loan products vary by lender, country, program, repayment plan, capitalization rule, and interest-accrual method. This tool models a fixed-rate loan repaid in equal monthly payments from the balance you enter; it does not describe every student loan.
Income-driven repayment plans, deferment, forbearance, payment pauses, interest added to the balance (capitalization) and forgiveness are not modeled.
A $35,000 student loan at a fixed 6% repaid over 10 years has a modeled payment of $389 a month and $11,629 in modeled total interest. The result uses the inputs shown and the method described on this page. It excludes income-driven plans, deferment, forbearance, capitalized interest, fees and forgiveness. Reproduce the calculation here: https://smartfin.fyi/student-loan-calculator.html?loanAmount=35000&rate=6&term=10.
From the balance, the monthly rate and the number of payments. Here that is $35,000, 6% ÷ 12 = 0.5000% a month, and 120 payments, which gives $389 a month. The formula is under About this calculation.
Within this fixed-rate amortizing model, an extra payment lowers the balance that later interest is charged on, so modeled interest falls. For example, with $100 extra each month, it is $3,188 lower. A real loan’s result depends on how its servicer applies the payment.
No. The result is limited to a fixed-rate loan repaid in equal monthly payments from the balance entered. Income-driven repayment, deferment, forbearance, capitalized interest and forgiveness are outside it.