Federal vs Private Student Loan Calculator
This federal vs private student loan calculator helps you compare borrowing cost, payment size, and deferment-related tradeoffs across two common education-loan paths.
Calculator
Adjust the inputs to explore different scenarios instantly.
Estimated private cost advantage
$2,109
How it works
Enter a loan amount, federal and private interest rates, the repayment term, and any deferment period you want to stress test. The calculator estimates each option starting balance after deferment, monthly payment, and total repayment cost.
Example calculation
A federal loan with a slightly higher rate can still be competitive when a private option has less flexibility or interest keeps accruing during a pause. Looking at starting balance after deferment can change the comparison quickly.
Why this matters
Borrowers often focus on the headline rate, but repayment structure and pause assumptions can change the real cost of a loan. A side-by-side estimate makes those tradeoffs easier to see.
Federal and private loans are not just rate differences
A private student loan may show a lower rate, while a federal loan may offer repayment flexibility, deferment options, income-driven plans, or forgiveness paths.
This calculator compares payment and cost math while keeping the broader federal-versus-private tradeoff visible.
What the comparison weighs
- Compares federal and private loan payment estimates.
- Shows total repayment cost under each scenario.
- Models how deferment or delayed repayment can affect starting balance.
- Helps separate interest-rate savings from flexibility and protection tradeoffs.
When to compare loan types
- When choosing between federal and private borrowing.
- When a private loan advertises a lower rate.
- When estimating the effect of deferred repayment.
- Before replacing federal loans with private debt.
Example: the lower rate is not the whole decision
A private loan with a lower interest rate may produce a lower payment, but it may not include the same repayment flexibility as a federal loan.
If payments are deferred and interest accrues, the starting balance at repayment can also change the comparison.
- Borrowing amount entered by the user
- Federal and private rates entered separately
- Repayment term entered by the user
- Deferment assumptions included when relevant
The cheapest-looking loan can be less attractive if it removes options the borrower may need later.
How costs are compared
The calculator estimates monthly payment and total repayment for each loan scenario using standard amortization math.
If deferment is modeled with accruing interest, the repayment balance may be higher than the original amount borrowed.
How to read the comparison
If the private option is cheaper, consider whether the savings are large enough to justify fewer federal protections.
If the federal option costs more, the added cost may still buy flexibility if income-driven repayment, deferment, or forgiveness eligibility could matter.
Federal vs private mistakes
- Choosing private loans based only on APR.
- Ignoring federal repayment and forgiveness options.
- Assuming deferment means no interest accrues.
- Comparing different terms without noticing total cost changes.
- Borrowing more than needed because the payment looks manageable.
Ways to compare responsibly
- Compare same-term options before changing term length.
- Check whether a private rate is fixed or variable.
- Verify current federal loan rules directly with Federal Student Aid.
- Use private loans cautiously when federal options remain available.
Frequently asked questions
Does this include every federal borrower protection?
No. This is a planning comparison focused on payment and cost. It does not assign a dollar value to forgiveness options, income-driven plans, or every hardship protection.
Why does deferment matter in the comparison?
If interest accrues during a payment pause, your starting balance at repayment can be higher. That can increase both the monthly payment and lifetime cost.
Can a private loan still be cheaper?
Yes. A lower private rate can reduce monthly payment and total cost, especially if the term is similar and you do not expect to need federal flexibility.
Is this the same as lender prequalification?
No. This is a planning estimate, not an approval or quote.