Student Loan Calculator
Estimate your fixed-rate student loan monthly payment, total interest, and total repayment. A simple repayment estimate only — not a federal repayment-plan (IBR, PAYE, SAVE) calculator.
Calculator Inputs
Your current student loan balance.
The fixed nominal annual interest rate (e.g. 6.5 for 6.5%).
How many years (and months) you have to repay the loan, assuming fixed monthly payments.
Additional months (0-11). For 18 months, enter 1 year 6 months.
- Monthly Payment
- $227.10
- Original Loan Balance
- $20,000.00
- Total Interest
- $7,251.30
- Total Repayment
- $27,251.30
- Number of Monthly Payments
- 120
- 10-Year Term Monthly Payment
- —
- 10-Year Term Total Interest
- —
- Monthly Payment Difference vs. 10-Year Term
- —
- Total Interest Difference vs. 10-Year Term
- —
- Note
- This calculator provides a simple fixed-rate student loan repayment estimate. It does not determine federal repayment-plan eligibility, forgiveness, income-driven payments, or deferment/forbearance.
About these results
CalcSpectrum calculators produce automated estimates using established formulas and the specific values you enter. Because real-world outcomes depend on input accuracy, mathematical assumptions, and rounding conventions, please verify critical figures with an appropriately qualified financial, tax, medical, legal, or other professional, as relevant.
Financial Notice: These figures are informational estimates for personal planning only. They do not constitute financial, investment, tax, or legal advice, nor do they represent a lending offer or credit approval. Provider and financial institution figures, rates, fees, and underwriting requirements may differ.
How It's Calculated
Formula
This calculator provides a simple fixed-rate student loan repayment estimate: given your loan balance, a fixed annual interest rate, and a repayment term, it computes the fixed monthly payment using the standard amortization formula — the same math used for personal loans and other fixed-rate installment debt. It does not determine federal repayment-plan eligibility, forgiveness, income-driven payments, or deferment/forbearance — those depend on program rules this calculator does not model. If your term differs from 10 years, this calculator also shows a simple mathematical comparison against a 10-year term at the same balance and rate, so you can see how a shorter or longer term changes your monthly payment and total interest — this is a math comparison only, not a recommendation about which federal repayment plan to choose.
Worked Examples
$20,000 balance, 7.5% annual rate, 5-year term
- Periodic rate r = 0.075 / 12 = 0.00625; n = 5 × 12 = 60 payments
- Monthly payment = 20000 × 0.00625 × (1.00625)^60 / ((1.00625)^60 − 1) ≈ $400.76
- 10-year comparison at the same balance and rate: monthly payment ≈ $237.40 — the 5-year term's payment is about $163.36 higher per month, but total interest is far lower over the shorter term
$40,000 balance, 5% annual rate, 25-year term
- Periodic rate r = 0.05 / 12 ≈ 0.0041667; n = 25 × 12 = 300 payments
- A 25-year term produces a lower monthly payment than a 10-year term at the same balance and rate, but accumulates substantially more total interest over the longer repayment period
Frequently Asked Questions
Does this calculator determine my federal loan forgiveness or repayment plan eligibility?
No. This is a simple fixed-rate repayment calculator only. It does not model income-driven repayment plans, loan forgiveness programs, deferment, forbearance, or federal eligibility rules — those depend on program-specific rules this calculator does not evaluate. Consult your loan servicer or an official federal student aid resource for those questions.
What is the 10-year comparison for?
It's a simple mathematical comparison showing what your monthly payment and total interest would be at a 10-year term, at the same balance and rate, alongside your selected term's figures. It's shown because 10 years is a common standard repayment length, not because it represents a specific federal repayment plan — it's math only, not a program recommendation.
Why does a longer term lower my monthly payment but increase total interest?
Spreading the same balance over more payments reduces each individual payment, but interest accrues on the outstanding balance for longer, so the total interest paid over the life of the loan increases. This tradeoff is the same for any fixed-rate installment loan, not specific to student loans.
What if my student loan has a variable interest rate?
This calculator assumes a fixed rate for the entire term. If your loan's rate can change, your actual payment and total interest will differ from this estimate once the rate changes.