Student Loan Calculator

How to use the student loan calculator

Enter your total loan amount, interest rate (find this on your loan documents or FSA website), desired repayment term (commonly 10 years for federal Stafford loans), and grace period length. The calculator estimates your monthly payment, total interest paid, and payoff timeline.

Understanding the inputs

Loan amount: The total principal you borrowed. If you have multiple loans, calculate each separately or input the combined total.

Interest rate (APR): Federal loans have fixed rates (currently 5.5–8.5% depending on year and loan type). Private loans vary by lender and credit score (typically 4–12%). Look this up in your loan servicer’s online portal.

Repayment term: Standard federal repayment is 10 years (120 payments). Extended plans go up to 25 years. Shorter terms mean higher payments but less total interest.

Grace period: Federal Stafford loans allow 6 months grace. Private loans may offer 0–12 months. Even during grace, interest accrues on unsubsidized loans.

How federal student loans work

Grace period and capitalization

When you graduate or drop below half-time enrollment, your grace period begins. For 6 months, you make no payments. However, unsubsidized loans continue accruing interest at your stated APR. On subsidized loans (based on financial need), the federal government covers interest during grace.

At the end of grace, any accrued interest is capitalized — added to your principal. This increases your loan balance and the monthly payment you owe. For example, a $30,000 loan at 5% accumulates ~$750 in interest during a 6-month grace period, raising your principal to $30,750 before repayment begins.

Standard repayment (10 years)

This is the default option: fixed monthly payment over 10 years, during which you pay off principal and interest evenly. It results in the lowest total interest but requires the highest monthly payment.

Extended repayment (20–25 years)

Lowers monthly payments but substantially increases total interest. Useful if you’re struggling with the standard payment but you have stable long-term income.

Income-driven repayment

Federal loans can be placed on income-driven plans (Pay As You Earn, Revised Pay As You Earn, Income-Based Repayment, Income-Contingent Repayment). Payments are capped at 10–15% of discretionary income. If you work in public service, remaining balance may be forgiven after 10 years. This calculator assumes standard repayment; use the Federal Student Aid website to model income-driven scenarios.

Strategies to manage student debt

1. Understand your loan types Federal loans offer consumer protections private loans don’t. Prioritize paying private loans first if rates are equal, to keep federal protections.

2. Make payments during grace if possible If you can afford it, paying down principal during your grace period prevents capitalization of accrued interest. Even $100/month during 6 months saves ~$40 in future interest.

3. Refinance only when it makes sense Refinancing federal loans to a private loan locks you out of income-driven repayment and forgiveness. Only refinance if you have stable income, good credit, and a rate reduction of at least 1%.

4. Leverage employer benefits Some employers offer student loan repayment assistance (up to $5,250/year, tax-free). Check your benefits package.

5. Plan for tax deductions You can deduct up to $2,500 in student loan interest annually on your federal tax return. This reduces your taxable income.

Related calculators and resources

Use our loan calculator to compare general loan terms. For planning college costs in the first place, see our college savings calculator to estimate future tuition and required savings. To incorporate student loans into a broader financial plan, check our budget calculator.

Federal vs. Private Loans: Key Differences

Federal loans (Stafford, PLUS, Perkins)

Federal loans are issued directly by the U.S. Department of Education or through banks participating in the Federal Direct Loan program. Key features:

• Fixed interest rates set by Congress: typically 5.5–8.5% depending on loan type and origination year
• Grace period of 6 months (Stafford) after graduation or dropping below half-time enrollment
• Income-driven repayment plans cap payments at 10–15% of discretionary income
• Public service loan forgiveness (PSLF) forgives remaining balance after 120 qualifying payments (10 years) if employed by government or nonprofit
• Loan forgiveness programs for teachers, doctors in underserved areas
• No prepayment penalties — you can pay extra or pay off early without charges

Private student loans

Private loans are issued by banks, credit unions, and online lenders. Key features:

• Variable or fixed interest rates typically 4–12%, determined by creditworthiness and market conditions
• No grace period on many loans (some offer 6–12 months)
• No income-driven repayment — you’re locked into your loan agreement’s payment schedule
• No forgiveness programs — if you have hardship, your only option is to refinance
• Shorter repayment terms often available (5–7 years vs. 10+ for federal)
• Require a co-signer if you’re a recent grad with limited credit history

Which should you prioritize?

If you have both federal and private loans: prioritize paying federal loans first (if rates are similar) to preserve federal protections. Private loans lose all consumer protections if you refinance, so it’s better to keep federal loans in their original form when possible.

Income-driven repayment plans explained

Federal student loans offer four income-driven plans that can dramatically lower your monthly payment if your income is low or you’re pursuing public service:

Pay As You Earn (PAYE)

• Payment cap: 10% of discretionary income
• Requires recent grad (within 10 years of latest loan disbursement)
• Remaining balance forgiven after 20 years
• Very favorable for low earners

Revised Pay As You Earn (REPAYE)

• Payment cap: 10% of discretionary income
• Available to all borrowers regardless of graduation date
• Remaining balance forgiven after 20–25 years
• Interest subsidy: government covers unpaid interest for first 3 years

Income-Based Repayment (IBR)

• Payment cap: 10–15% of discretionary income depending on disbursement date
• Remaining balance forgiven after 20–25 years
• Less favorable than PAYE/REPAYE for low earners

Income-Contingent Repayment (ICR)

• Payment cap: 20% of discretionary income
• Highest payments of income-driven plans
• Remaining balance forgiven after 25 years
• Rarely chosen unless other plans don’t apply

Example: A doctor making $40k in residency with $200k in loans might pay only $200–300/month under REPAYE (10% of their low discretionary income), vs. $2,200+ under standard 10-year repayment. After residency ends (5–7 years) and income rises to $200k, payments recalculate upward. This flexibility is federal loans’ key advantage.

Refinancing considerations

Refinancing student loans means taking out a new private loan to pay off federal loans. Advantages: often lower rate (if you’ve improved credit or income since original loan). Disadvantages: you permanently lose federal protections and income-driven repayment eligibility.

Only refinance if:

1. You’re solidly employed with stable income
2. Your credit score has improved significantly (700+)
3. You can get a rate reduction of at least 1–2 percentage points
4. You’re confident you won’t need income-driven repayment or PSLF in the future

Never refinance if:

1. You’re pursuing public service (PSLF requires federal loans)
2. You might face income fluctuation or unemployment
3. Your federal rate is already low (5% or below)

Planning around income-driven repayment and PSLF

If you’re considering public service loan forgiveness (PSLF — government, nonprofit, or qualifying employer positions), plan carefully:

1. Verify employment eligibility on studentaid.gov before accepting a job
2. File PSLF form annually to track qualifying payments (some loans weren’t counted due to servicer errors; recent Biden administration remedies are correcting this)
3. Consolidate federal loans before applying for income-driven repayment if you have multiple loans
4. Stay with federal servicer — transferring between servicers doesn’t reset your payment count, but keeping records is important
5. Make 120 qualifying payments (10 years) under income-driven repayment, then remaining balance is forgiven tax-free

Example: A teacher with $100k in federal loans earning $50k/year could enroll in PAYE, pay ~$200/month for 10 years ($24,000 total), then have the remaining $76,000 forgiven tax-free. This is dramatically better than standard 10-year repayment at $1,000+/month.

Building your repayment strategy

1. Know your loans: Log into studentaid.gov, identify whether each loan is federal or private, check interest rates, servicer info
2. Calculate affordability: Use this calculator to see standard 10-year payments; use your federal servicer’s income-driven repayment estimator if applicable
3. Consider your career path: Public service? Pursue PSLF. Corporate career with high income trajectory? Refinance to lower rate and pay aggressively
4. Make extra payments when possible: Any bonus, raise, or windfall applied to loans saves thousands in interest
5. Review annually: Income changes, career pivots, and family circumstances affect optimal repayment strategy

Related calculators and resources

Use our loan calculator for non-student-specific loans. For planning college costs before borrowing, see our college savings calculator to estimate how much you need to save to avoid or minimize loans. Once you’re working and managing multiple debts, check our budget calculator to prioritize loan payments alongside other financial goals.

Disclaimer: The examples and calculations provided here are for educational purposes. For current benchmark rates, please refer to authoritative sources such as the Federal Reserve (2025) or your local financial institution.\n