What Is a Student Loan Calculator?

A student loan calculator is an online tool that helps you estimate your monthly payments, total interest paid, and full repayment cost for education loans — before you borrow or while you're already in repayment. By entering your loan balance, interest rate, and repayment term, you get an instant picture of your financial commitment, helping you plan your post-graduation budget with confidence.

Our calculator goes further than basic tools. It covers federal and private loans, compares repayment plans side-by-side, models early payoff savings, estimates loan forgiveness under IBR, PSLF, and the new RAP program, and even projects how your balance grows while you're still in school.

What Is a Student Loan?

A student loan is a type of financial aid designed to help students pay for higher education expenses — including tuition, fees, textbooks, housing, and living costs. Unlike grants or scholarships, student loans must be repaid, typically with interest, after you leave school.

There are two main categories of student loans in the United States:

1. Federal Student Loans

Issued by the U.S. Department of Education, federal loans offer fixed interest rates, flexible repayment plans, and access to forgiveness programs. For the 2025–2026 academic year, federal interest rates are:

Loan Type	Who It's For	2025–26 Rate
Direct Subsidized	Undergrads with financial need	6.39%
Direct Unsubsidized	All undergrads	6.39%
Direct Unsubsidized	Graduate students	7.94%
Direct PLUS	Grad students & parents	8.94%

The key difference between subsidized and unsubsidized loans is interest during school: the government covers interest on subsidized loans while you're enrolled at least half-time. Unsubsidized loans accrue interest immediately — and that interest can capitalize (be added to your principal) when repayment begins.

2. Private Student Loans

Private loans come from banks, credit unions, and online lenders. Unlike federal loans, rates are based on your (or your cosigner's) credit score and income. As of 2025–26, private fixed rates typically range from 4% to 17.99% APR, and variable rates start around 3.5%. Private loans generally lack access to income-driven repayment plans, forgiveness programs, and federal protections like deferment — so they should be a last resort after exhausting federal aid.

How to Use This Calculator

Our student loan calculator has five powerful modes — each designed to answer a specific question about your loans:

• Standard: Enter your loan balance, rate, and term to see your monthly payment, total interest, and full amortization schedule.
• Plans: Compare all major repayment plans — Standard 10-Year, Graduated, Extended, IBR, PAYE, ICR, and the new RAP — based on your income and family size.
• Early Payoff: Find out how much interest you save by making extra payments each month. Use the slider to target a specific payoff date.
• Forgiveness: Estimate how much you'd have forgiven under IBR, PSLF (Public Service Loan Forgiveness), or the new Repayment Assistance Plan (RAP), launching July 1, 2026.
• In-School Growth: See exactly how much your balance will have grown by graduation — factoring in whether interest is subsidized, deferred, or paid during enrollment.

Federal Repayment Plans Explained (2026)

Choosing the right repayment plan can save — or cost — you tens of thousands of dollars. Here's what you need to know about the current landscape:

Standard Repayment Plan

Fixed payments over 10 years. You pay the least total interest of any plan, but your monthly payments are the highest. This is the default plan if you don't choose one.

Graduated Repayment Plan

Payments start low and increase every two years over 10 years. Ideal if you expect your income to grow steadily after graduation. You'll pay more total interest than the Standard Plan.

Extended Repayment Plan

Fixed or graduated payments stretched over up to 25 years. Monthly payments drop significantly, but total interest paid can more than double. Available if you have over $30,000 in federal loans.

Income-Based Repayment (IBR)

Payments are capped at 10%–15% of your discretionary income, depending on when you borrowed. Remaining balances are forgiven after 20–25 years of qualifying payments. IBR now has no "partial financial hardship" requirement thanks to 2025 legislation changes.

Pay As You Earn (PAYE)

Payments capped at 10% of discretionary income, forgiveness after 20 years. Currently available to borrowers with loans before July 1, 2026, but being phased out by 2028.

Repayment Assistance Plan (RAP) — NEW July 2026

Signed into law on July 4, 2025, as part of the "One Big Beautiful Bill Act," RAP launches July 1, 2026. Key features include payments set at 1%–10% of your adjusted gross income (minimum $10/month for income under $10,000), a government interest subsidy (any interest your payment doesn't cover is waived), a government principal match of up to $50/month, and forgiveness after 30 years. RAP will be the only plan eligible for PSLF going forward.

Public Service Loan Forgiveness (PSLF)

Work full-time for a qualifying government or nonprofit employer, make 120 qualifying monthly payments on an eligible repayment plan, and your remaining federal loan balance is forgiven — tax-free. Under new RAP rules effective July 2026, RAP will be the only qualifying plan for PSLF. If you're pursuing PSLF, switching out of SAVE to IBR or another qualifying plan is urgent.

Tips to Reduce Your Student Loan Cost

• Make interest payments while in school. Even small payments on unsubsidized loans prevent interest capitalization, which can add thousands to your principal by graduation.
• Always pay more than the minimum. Any extra payment goes directly to principal, reducing future interest. Try our Loan Calculator to model different payment scenarios.
• Refinance strategically. If you have strong credit and stable income — and you're not pursuing forgiveness — refinancing private loans to a lower rate can save significantly. Use our Refinance Calculator to compare scenarios.
• Never refinance federal loans if pursuing PSLF. Refinancing converts federal loans to private, permanently eliminating access to forgiveness programs.
• Apply tax windfalls to principal. A tax refund or bonus applied to your loan balance early in repayment saves disproportionately more interest because the balance is highest.
• Choose the right repayment plan for your goal. If your goal is minimizing total cost, the Standard 10-Year Plan wins. If cash flow is tight, IBR or RAP lower monthly payments — but extend your repayment timeline.

Student Loan Interest: How It Works

Understanding how interest accrues is essential to managing student debt effectively. Federal and most private student loans use simple daily interest, calculated as:

Daily Interest = Balance × (Annual Rate ÷ 365)

Each monthly payment first covers the accrued interest from that period, with the remainder reducing your principal. Early in repayment, most of your payment goes to interest — making extra payments most powerful in the first few years.

If interest is not paid and accrues unpaid (as with unsubsidized loans during school, or during certain forbearances), it can capitalize — being added to your principal. This increases your balance and means you pay interest on interest, compounding your total cost significantly.

The $2,500 Student Loan Interest Deduction

The IRS allows you to deduct up to $2,500 per year in student loan interest from your taxable income — even if you don't itemize deductions. This deduction begins to phase out above $75,000 AGI (single filers) or $155,000 (married filing jointly) for tax year 2025, and is eliminated entirely above $90,000 and $185,000 respectively. This is one of the few tax benefits available to student loan borrowers and can meaningfully reduce your tax bill in the early years of repayment when interest payments are highest.

More Financial Tools You'll Find Useful

Tackling student debt is just one part of your overall financial picture. These related tools from CatchyTools can help you manage debt holistically: