How to Calculate Your Student Loan Payment
Student loan payments are calculated using the same amortization formula used for most installment loans. Your monthly payment depends on three variables: your loan balance, your interest rate, and your repayment term.
Formula:
Where M is your monthly payment, P is your loan principal, r is your monthly interest rate (annual rate divided by 12), and n is the total number of payments.
Example — $40,000 loan at 6.5% interest:
| Repayment Term | Monthly Payment | Total Interest Paid | Total Cost |
|---|---|---|---|
| 10 years | $454 | $14,480 | $54,480 |
| 15 years | $348 | $22,640 | $62,640 |
| 20 years | $298 | $31,520 | $71,520 |
| 25 years | $269 | $40,700 | $80,700 |
A shorter repayment term means higher monthly payments but significantly less total interest paid. Our calculator lets you compare multiple scenarios instantly so you can find the right balance between monthly affordability and total cost.
Federal vs Private Student Loans — Key Differences
Understanding the difference between federal and private student loans is essential before choosing a repayment strategy.
| Feature | Federal Student Loans | Private Student Loans |
|---|---|---|
| Lender | U.S. Department of Education | Banks, credit unions, private lenders |
| Interest rate | Fixed, set annually by Congress | Fixed or variable, set by lender |
| 2026 undergraduate rate | 6.53% | Varies — typically 4% to 16% |
| Income driven repayment | Available | Not available |
| Loan forgiveness programs | Available (PSLF, SAVE, IDR) | Not available |
| Deferment and forbearance | Flexible options | Limited options |
| Credit check required | No (most loans) | Yes |
Key takeaway: Federal loans offer significantly more borrower protections and repayment flexibility. Exhaust all federal loan options before turning to private loans. If you have both, prioritize private loan repayment since those lack the safety nets available on federal loans.
Student Loan Repayment Plans Explained
Federal student loan borrowers have access to multiple repayment plans. Choosing the right one can significantly impact your monthly payment and total interest paid.
Standard Repayment Plan
Fixed payments over 10 years. You pay the least in total interest but have the highest monthly payment. Best for borrowers who can afford the payment and want to minimize total cost.
Graduated Repayment Plan
Payments start low and increase every two years over 10 years. Designed for borrowers whose income is expected to grow. You pay more in total interest than the standard plan.
Extended Repayment Plan
Extends repayment to up to 25 years with fixed or graduated payments. Significantly lowers monthly payments but dramatically increases total interest paid.
Income-Driven Repayment (IDR) Plans
Monthly payments are capped as a percentage of your discretionary income. Remaining balance is forgiven after 20 to 25 years of qualifying payments. Options include SAVE, PAYE, IBR, and ICR.
SAVE Plan (Saving on a Valuable Education)
The newest and most generous IDR plan as of 2026. Payments are capped at 5% of discretionary income for undergraduate loans. Interest does not capitalize as long as you make your required payments. Borrowers with original balances of $12,000 or less may qualify for forgiveness after just 10 years.
Public Service Loan Forgiveness (PSLF)
Borrowers working full time for a qualifying government or nonprofit employer may have their remaining federal loan balance forgiven after 120 qualifying monthly payments (10 years). One of the most powerful student loan benefits available for eligible borrowers.
How Long Will It Take To Pay Off My Student Loans?
Your payoff timeline depends on your loan balance, interest rate, repayment plan, and whether you make any extra payments.
Payoff timelines for $50,000 in federal loans at 6.5%:
| Monthly Payment | Payoff Time | Total Interest Paid |
|---|---|---|
| $454 (standard 10-yr) | 10 years | $4,480 |
| $350 | 17 years 4 months | $22,900 |
| $500 | 8 years 9 months | $12,500 |
| $700 | 6 years 1 month | $8,200 |
Strategies to pay off student loans faster:
- Make payments during your grace period before interest capitalizes
- Pay more than the minimum every month — even an extra $50 makes a measurable difference
- Apply windfalls like tax refunds or bonuses directly to your principal
- Choose the standard 10-year plan over extended repayment if you can afford it
- Refinance to a lower interest rate if you have strong credit and stable income
Should I Refinance My Student Loans?
Refinancing replaces your existing student loans with a new private loan at a potentially lower interest rate. It can save thousands in interest — but it comes with a significant tradeoff for federal loan borrowers.
When refinancing makes sense:
- You have private student loans with a high interest rate
- You have federal loans but do not plan to use income-driven repayment or forgiveness programs
- Your credit score is 700 or higher and your income is stable
- You can qualify for a rate meaningfully lower than your current rate
When refinancing does not make sense:
- You are pursuing Public Service Loan Forgiveness
- You are enrolled in or planning to enroll in an income-driven repayment plan
- Your income is unstable and you may need deferment or forbearance options
- Your credit score is below 650 and you are unlikely to qualify for a better rate
Frequently Asked Questions
How much will my student loan monthly payment be?
Your monthly payment depends on your loan balance, interest rate, and repayment term. On a $30,000 federal loan at 6.5% on the standard 10-year plan, your monthly payment would be approximately $340. Use our calculator to get an exact figure based on your specific loan details.
What is the monthly payment on $50,000 in student loans?
On the standard 10-year federal repayment plan at 6.5%, the monthly payment on $50,000 in student loans is approximately $567. Over the life of the loan, you would pay roughly $18,000 in total interest, bringing your total repayment to about $68,000.
How do I pay off my student loans faster?
The most effective ways to pay off student loans faster are to pay more than the minimum each month, make lump sum payments when you receive extra income, and choose the shortest repayment term you can afford. Refinancing to a lower interest rate can also reduce your total cost and allow more of each payment to go toward principal.
How does student loan interest work?
Student loan interest accrues daily on your outstanding principal balance. Your annual interest rate is divided by 365 to get a daily rate, which is then multiplied by your balance. On income-driven plans like SAVE, the government covers any unpaid interest that exceeds your monthly payment, preventing your balance from growing.
What happens if I cannot pay my student loans?
Federal student loan borrowers have several options including deferment, forbearance, and income-driven repayment plans that can reduce payments to as low as $0 per month based on income. Defaulting on student loans has serious consequences including credit damage, wage garnishment, and loss of eligibility for future federal aid. Contact your loan servicer immediately if you are struggling to make payments.
Should I refinance my student loans?
Refinancing makes the most sense if you have private loans with high interest rates or federal loans you are certain you will not need forgiveness programs for. If you work in public service or plan to use income-driven repayment, refinancing federal loans is generally not advisable since you permanently lose access to those programs.
How long does it take to pay off $100,000 in student loans?
On the standard 10-year plan at 6.5%, $100,000 in student loans carries a monthly payment of approximately $1,136 and total interest of about $36,200. Extending to 20 years reduces the monthly payment to around $746 but increases total interest to approximately $79,000. Making extra payments or refinancing to a lower rate can significantly shorten the timeline.
What is the best repayment plan for student loans?
The best plan depends on your income, loan balance, career, and financial goals. The standard 10-year plan minimizes total interest for borrowers who can afford it. Income-driven repayment is best for borrowers with high balances relative to income or those pursuing PSLF. Refinancing is worth exploring for high-income borrowers with strong credit who have private loans or do not need federal protections.
Last updated: 2026 | Rates based on standard published federal loan averages. Custom refinancing options vary by lender credit assessment.