Student Loan Calculator

Using the student loan estimate

A student loan payment estimate helps translate a balance into a recurring budget commitment. This tool models one balance repaid through equal monthly installments at a constant interest rate. It separates the monthly payment from the total interest and total amount paid, so a lower installment is not mistaken for a cheaper loan. Use your current balance, loan rate and intended repayment period rather than the original amount borrowed if you are planning from today. The starting rate is illustrative, not a current federal or private loan offer.

Step-by-step inputs

1. Loan balance. Enter the balance you want to amortize, using a recent statement. This is the amount financed at the start of the modeled schedule, not your monthly payment or the original school tuition bill. Starting example: $30,000 .
2. Interest rate (%). Enter the annual interest rate for that balance. Do not type the monthly rate. For multiple loans with different rates, run separate estimates rather than assuming a simple average gives an exact combined payment. Starting example: 5.5 .
3. Repayment term (years). Enter the years remaining in the repayment schedule you want to compare. The calculator converts this to a rounded whole number of monthly installments; it does not select a repayment program for you. Starting example: 10 .

Worked example with the starting values

Using the starting inputs, the estimate is Monthly payment: $325.58 .

The starting balance and annual rate determine the monthly interest factor. The payment formula finds an equal installment that amortizes the balance over the selected payment count. Multiplying that installment by the count gives total paid; subtracting the starting balance gives modeled interest. Display rounding can make the sum of rounded payments differ slightly from the unrounded total. The principal-and-interest chart describes the whole repayment period, not the split in the first installment.

Total interest

$9,069

Total paid

$39,069

Number of payments

120

Compare repayment term (years) scenarios

The balance and rate remain at their starting values. Only the repayment period changes. These are amortization scenarios, not confirmation that a particular student loan offers each term.

Make a useful comparison

Compare repayment periods with the balance and rate held constant. A longer period generally reduces the monthly commitment while increasing total interest. Look at both lines before deciding whether the extra monthly flexibility is worth the modeled additional cost. The table below isolates the period rather than changing both the rate and term at once.

Check a proposed payment against take-home income and essential expenses. Include other loan payments separately and allow for irregular bills. This tool has no income, household-size or eligibility fields, so it cannot establish an income-based payment, determine forgiveness or decide which repayment option you qualify for.

If you are comparing a refinancing quote, enter the quoted rate and repayment period as a separate scenario and check fees and loan protections outside the calculation. A smaller payment caused by stretching repayment is different from a smaller payment caused by a lower rate. Do not assume that two loans with the same installment have the same total cost or terms.

Common mistakes to avoid

• The model uses equal monthly amortization, not the exact daily interest and posting dates of your servicer. Deferment, capitalization, late charges, payment pauses and changing rates are not simulated. Use the servicer's schedule for amounts actually due.
• Do not enter the original loan balance with only the remaining repayment years unless you intentionally want to model that larger amount. Pair today's outstanding balance with the future schedule being evaluated.
• Extra payments are not an input here. Reducing the years field models a different required installment; it does not reproduce an irregular extra-payment plan or predict how a servicer applies a particular transfer.