Student Loan Calculator: Should You Pay Off or Refinance?

Published August 2026 | 7 min read

The average student loan borrower owes $37,000. Whether you're dealing with federal loans at 5% or private loans at 10%+, the math matters. Use our free student loan calculator to see your payoff date, total interest, and whether refinancing makes sense.

How the Calculator Works

Enter your loan details:

Loan balance — Current principal remaining
Interest rate — Your current APR
Monthly payment — What you're paying now (or what you could pay)

The calculator shows your payoff date, total interest paid, and how much extra payments save you.

Federal vs. Private Loans: Know What You're Giving Up

Feature	Federal	Private
Income-driven repayment	✅ Yes	❌ No
Loan forgiveness	✅ Yes (PSLF, etc.)	❌ No
Deferment/Forbearance	✅ Generous	⚠️ Limited
Interest rate	Fixed (5-7%)	Variable (4-14%)

Never refinance federal loans into private loans if you might need income-driven repayment or forgiveness.

When Refinancing Makes Sense

You have high-interest private loans (8%+)
Your credit score improved significantly since graduation
You have a stable income and emergency fund
You won't need federal protections

The Extra Payment Snowball

On a $30,000 loan at 6% for 10 years:

Standard payment: $333/month, $9,967 total interest
+$100/month: Pay off 2.5 years early, save $2,400 in interest
+$200/month: Pay off 4 years early, save $4,100 in interest

💡 Compare Refinance Rates

See if you qualify for a lower rate without hurting your credit.

Check Refinance Rates →

The Bottom Line

Use our student loan calculator to model different scenarios. If you have federal loans under 5%, paying them off aggressively usually beats refinancing. If you have private loans over 8%, refinancing could save thousands.