Student Loan Calculator
Plan your repayment by calculating monthly payment and total interest across standard and extended plans, and see the exact savings any extra payment produces.
$
years
Enter your values above to see the results.
Tips & Notes
- ✓Make interest-only payments during the grace period or in-school deferment to prevent unpaid interest from capitalizing onto your principal balance.
- ✓Extra payments of even $50-$100 per month started at graduation save disproportionately more than the same payments made later in the repayment term.
- ✓For federal loans, explore income-driven repayment plans if your payment exceeds 10% of discretionary income — they cap payments and offer forgiveness after 20-25 years.
- ✓Refinancing federal loans to private removes access to income-driven repayment, forgiveness programs, and deferment — understand what you give up before refinancing.
- ✓Pay off the highest-rate loan first when managing multiple student loans — the avalanche method minimizes total interest across the full portfolio.
- ✓Check whether your employer offers student loan repayment assistance — many large employers now contribute $100-$200 per month toward employee student loan balances.
Common Mistakes
- ✗Ignoring accruing interest during deferment or forbearance — $45,000 at 6.5% accrues $243/month in interest that capitalizes onto the principal if unpaid.
- ✗Choosing extended repayment to lower the payment without modeling total interest — a 25-year term on $50,000 at 6.5% pays $45,900 in interest versus $18,040 on 10 years.
- ✗Refinancing federal loans to private without fully understanding what you lose — income-driven repayment, Public Service Loan Forgiveness, and deferment disappear.
- ✗Making minimum payments on multiple loans without directing extra funds to the highest-rate loan — random extra payments eliminate less interest than targeted payoff.
- ✗Not checking for employer repayment assistance programs — an employer contributing $150/month is worth $18,000 over 10 years in free loan repayment.
- ✗Assuming forgiveness programs are guaranteed — income-driven repayment forgiveness is taxable income in most cases, and program rules have changed multiple times.
Student Loan Calculator Overview
Student loans are often the largest debt a person takes on before fully understanding what debt means. A $50,000 balance at 6.5% over 10 years costs $18,600 in interest — a number few students calculate before signing. This calculator shows the full picture so repayment is never a surprise.
Federal and private student loans work the same way mathematically — a principal balance, an interest rate, and a repayment term determine the payment. The differences are in flexibility, forgiveness options, and what happens when you struggle to pay.
What each field means:
- Loan Amount — total outstanding student loan balance being calculated
- Interest Rate — annual rate on the loan; federal rates are fixed by Congress, private rates vary widely
- Loan Term — repayment period; standard federal term is 10 years, extended plans go to 25 years
- Down Payment — not typically applicable; enter 0 for student loans
What your results mean:
- Monthly Payment — fixed amount required each month under the standard repayment plan
- Total Paid — all payments over the full term; the true cost of the education debt
- Total Interest — what the lender earns; often 25-40% on top of the original balance on 10-year terms
- Interest-to-Principal ratio — how many cents of every dollar paid goes to interest versus reducing balance
Example — $45,000 at 6.5%, 10-year standard repayment:
Monthly payment: $508 Total paid over 10 years: $60,960 Total interest: $15,960 (35% added on top of original balance) Interest in year 1: $2,925 (roughly $244/month going to interest, not principal) Balance after 2 years of payments: $39,842 (only $5,158 paid off) Extended 25-year plan: $338/month but total interest balloons to $56,400
EX: How repayment term changes total cost on $45,000 at 6.5% 10-year standard: $508/month, total interest $15,960 15-year extended: $392/month, total interest $25,560 (+$9,600) 20-year extended: $335/month, total interest $35,400 (+$19,440) 25-year extended: $303/month, total interest $45,900 (+$29,940) The 25-year plan doubles the interest cost to save $205/month.
Monthly payment by balance and rate (10-year term):
| Loan Balance | 5.0% | 6.5% | 8.0% |
|---|---|---|---|
| $20,000 | $212 | $227 | $243 |
| $35,000 | $371 | $397 | $425 |
| $50,000 | $530 | $567 | $607 |
| $75,000 | $795 | $851 | $910 |
Repayment plan comparison — $50,000 at 6.5%:
| Plan | Monthly Payment | Total Interest |
|---|---|---|
| Standard (10yr) | $567 | $18,040 |
| Extended (20yr) | $373 | $39,520 |
| Income-driven (IDR) | Varies by income | May be forgiven after 20-25yr |
Making even small extra payments immediately after graduation, before interest has years to compound, is the single most effective student loan strategy available. A $50,000 balance at 6.5% with $100 extra per month pays off in 8 years instead of 10 and saves $3,200 in interest. Starting extra payments five years into the loan produces a fraction of that benefit — the compounding math heavily rewards early action.
Frequently Asked Questions
The standard federal student loan repayment term is 10 years (120 payments). Federal borrowers can also choose graduated repayment (payments start low and increase), extended repayment (up to 25 years for balances over $30,000), and income-driven plans that cap payments at 10-20% of discretionary income. Private loans typically offer 5-20 year terms. The standard 10-year term minimizes total interest but produces the highest monthly payment — the right choice depends on your income relative to your balance.
A widely used guideline is that total student loan debt should not exceed your expected starting annual salary. If you expect to earn $50,000 after graduation, borrowing more than $50,000 creates repayment strain on the standard 10-year plan. The payment on $50,000 at 6.5% for 10 years is $567/month — about 14% of a $50,000 gross salary, which is manageable. At $100,000 in debt on a $50,000 salary, the standard payment consumes 27% of gross income before taxes, creating significant financial stress.
If your student loan rate is below 5%, investing in tax-advantaged retirement accounts (401k with employer match, Roth IRA) likely produces better long-term outcomes than aggressive loan payoff. At rates above 7%, paying off the loan is a guaranteed return equal to the rate — which is difficult to beat on a risk-adjusted basis. Between 5-7%, the decision depends on your risk tolerance, time horizon, and whether you have high-interest debt elsewhere. Always capture any employer 401k match before directing extra funds to loans.
Federal student loans have significant flexibility: income-driven repayment plans can reduce payments to $0 for low-income borrowers, deferment allows temporary suspension of payments without penalty during qualifying hardship, and forbearance provides 12 months of reduced or paused payments in most cases. Interest typically continues accruing during these periods. Private student loans have more limited options — contact the servicer immediately if you anticipate difficulty, as options shrink after default. Default on federal loans triggers wage garnishment and tax refund seizure.
Capitalized interest is unpaid interest that is added to the principal balance, causing you to pay interest on the original interest. It most commonly occurs when leaving school, at the end of a deferment or forbearance period, or when switching repayment plans. On $45,000 at 6.5% with 6 months of unpaid interest, capitalization adds $1,463 to the principal — meaning your starting balance for repayment is $46,463 and you pay interest on that higher amount for the full term. Making interest-only payments during in-school or grace periods prevents this from occurring.
Refinancing makes sense when you have private loans at rates above current market, strong credit and income that qualify you for a significantly lower rate, and no need for federal loan protections. Refinancing federal loans to private is irreversible and permanently eliminates income-driven repayment, Public Service Loan Forgiveness, and federal deferment options. For borrowers in public service, teaching, or non-profit work who may qualify for PSLF, refinancing is almost always a costly mistake. For borrowers with stable private-sector income and no forgiveness eligibility, refinancing to a lower rate can save thousands.