Student Loan Calculator

Student Loan Calculator

Plan your loan repayment

CalculatorsFreeNo Signup
4.5(386 reviews)
All Tools

Loading tool...

About Student Loan Calculator

A student loan calculator for estimating monthly payments, total interest paid, and payoff timelines under different repayment plans. Enter loan balance, interest rate, and term to compare Standard (10-year), Graduated, Extended, and Income-Driven Repayment (IDR) plans. Model extra payments to see interest savings and early payoff dates. Covers both federal and private student loans. 100% client-side.

Student Loan Calculator Features

  • Monthly payment
  • Total interest
  • Payoff timeline
  • Repayment plan compare
  • Extra payments
  • Refinancing analysis
  • IDR plans
  • Amortization schedule
Americans collectively owe $1.77 trillion in student loan debt — the second-largest consumer debt category after mortgages — spread across 43.2 million borrowers (Federal Reserve Bank of New York, Q3 2024). The average bachelor's degree graduate carries $29,400 in student debt (The Institute for College Access and Success), with monthly payments averaging $393 under the Standard 10-year repayment plan. Understanding repayment options, interest mechanics, and strategies for faster payoff can save borrowers tens of thousands of dollars over the life of their loans.

Federal Student Loan Repayment Plans Compared

The Department of Education offers multiple repayment plans for federal student loans. Your choice directly impacts monthly payment amount, total interest paid, and eligibility for Public Service Loan Forgiveness (PSLF). The Federal Student Aid office at studentaid.gov provides official details on each plan.

2024 Repayment Plan Comparison ($30,000 Balance, 5.5% Rate)

PlanMonthly PaymentTotal PaidTotal InterestPayoff Time
Standard (10-year)$325$39,024$9,02410 years
Graduated$192–$577$41,520$11,52010 years
Extended Fixed$195$58,500$28,50025 years
SAVE (IDR)$0–$250*$45,000+$15,000+20–25 years
ICR~$340$48,000+$18,000+25 years

*SAVE payment depends on discretionary income. Balance may be forgiven after 20–25 years.

The SAVE Plan (2024)

The Saving on a Valuable Education (SAVE) plan, which replaced REPAYE in 2023, is the most generous IDR plan. Payments are capped at 5% of discretionary income for undergraduate loans (10% for graduate), and the government pays 100% of unpaid interest — meaning your balance never grows. However, the plan faces ongoing legal challenges as of 2024, with the Supreme Court expected to weigh in.

Student loan repayment plan comparison chart showing monthly payments and total cost

How Student Loan Interest Works

Student loan interest accrues daily using the formula: Daily Interest = (Balance × Annual Rate) ÷ 365. On a $30,000 loan at 5.5%: $30,000 × 0.055 ÷ 365 = $4.52 per day ($135.62/month). Under standard amortization, early payments are mostly interest — your first $325 payment applies approximately $135 to interest and $190 to principal.

Subsidized vs Unsubsidized Loans

FeatureSubsidizedUnsubsidized
Interest while in schoolGovernment paysBorrower responsible (accrues)
Grace period interestGovernment paysAccrues on balance
Need-basedYes (FAFSA required)No
Undergraduate limit$3,500–$5,500/yr$5,500–$7,000/yr (additional)
Graduate availabilityNo (since 2012)Yes ($20,500/yr)

Interest Capitalization: When Unpaid Interest Becomes Principal

Interest capitalization occurs when accrued unpaid interest is added to the principal balance, causing you to pay 'interest on interest.' This happens when you leave deferment, forbearance, or switch repayment plans. The CFPB estimates that interest capitalization increases total loan costs by 10–20% for borrowers who experience multiple capitalization events. Under the SAVE plan, unpaid interest is never capitalized — a significant advantage over older IDR plans.

The Power of Extra Payments: How to Pay Off Loans Faster

Extra Payment Impact Analysis

Extra Monthly PaymentPayoff Time (was 10yr)Interest SavedMonths Saved
$0 (standard $325)10 years$00
+$50 ($375/mo)8 years 2 months$1,68722 months
+$100 ($425/mo)7 years$2,83636 months
+$200 ($525/mo)5 years 6 months$4,42554 months
+$500 ($825/mo)3 years 3 months$6,31881 months

Based on $30,000 at 5.5%.

Targeting High-Interest Loans First

If you have multiple loans, the 'avalanche method' directs extra payments to the highest interest rate first. The 'snowball method' (popularized by Dave Ramsey) pays off the smallest balance first for psychological wins. Mathematically, the avalanche method saves more in total interest (NerdWallet analysis shows $1,000–$5,000 more in savings on typical student loan portfolios), but the snowball method has higher completion rates because early payoffs provide motivation — a finding supported by research published in the Journal of Consumer Research (2016).

Biweekly Payments

Paying half your monthly payment every two weeks results in 26 half-payments = 13 full payments per year (instead of 12). This one extra payment per year can shorten a 10-year loan to approximately 9 years and save $800–$1,200 in interest (on $30,000 at 5.5%). Most loan servicers accommodate biweekly payments through autopay options.

Extra payment impact chart showing interest savings and payoff acceleration

Student Loan Forgiveness: PSLF, IDR Forgiveness, and Eligibility

Public Service Loan Forgiveness (PSLF)

PSLF forgives the remaining federal loan balance after 120 qualifying payments (10 years) while working full-time for a qualifying employer (government, 501(c)(3) nonprofits, military). The Department of Education reported that as of September 2024, $69.2 billion has been forgiven for 946,000 borrowers through PSLF and related waivers. Qualifying requires: Direct Loans (consolidate FFEL/Perkins if needed), an IDR plan, and continuous qualifying employment. PSLF forgiveness is tax-free under current law.

Income-Driven Repayment Forgiveness

After 20–25 years of payments on an IDR plan (SAVE, IBR, ICR, PAYE), the remaining balance is forgiven. However, the forgiven amount is currently treated as taxable income (except through 2025 under the American Rescue Plan Act). This 'tax bomb' can be significant: $50,000 forgiven at a 22% marginal rate = $11,000 tax bill. Future legislation may extend the tax-free treatment, but it's not guaranteed.

Other Forgiveness Programs

  • Teacher Loan Forgiveness: Up to $17,500 after 5 years teaching in low-income schools (Direct and FFEL loans)
  • Military service: Various programs including SLRP (up to $65,000), GI Bill transfer, and branch-specific forgiveness
  • State programs: Many states offer forgiveness for healthcare workers, lawyers in underserved areas, and STEM professionals in targeted fields

Student Loan Refinancing: When It Makes Financial Sense

Federal vs Private: The Refinancing Tradeoff

Refinancing replaces your existing loans with a new private loan at a (hopefully) lower interest rate. The critical trade-off: refinancing federal loans into private loans permanently surrenders federal protections including IDR plans, PSLF eligibility, deferment, forbearance, and potential future forgiveness. The CFPB explicitly warns borrowers to carefully weigh this trade-off.

When Refinancing Makes Sense

FactorGood CandidatePoor Candidate
IncomeStable, high incomeVariable or uncertain income
Credit score720+ (best rates)Below 680
Rate reduction1%+ lower than currentMinimal rate improvement
PSLF eligibilityNot pursuing PSLFPursuing PSLF (don't refinance)
Forgiveness plansNot planning on IDR forgivenessOn track for IDR forgiveness

Refinancing Savings Example

$50,000 at 6.8% (federal rate) refinanced to 4.5% (private, 10-year): Monthly payment drops from $575 to $518, saving $6,824 in total interest. Over 10 years, this saves $57/month. However, if you later need IDR flexibility, you cannot access it. Companies like SoFi, Earnest, and Laurel Road offer competitive refinancing rates — Credible.com allows rate comparison across multiple lenders without affecting your credit score.

Step-by-Step Instructions

  1. 1Enter your total student loan balance (or individual loan amounts for multiple loans).
  2. 2Input the interest rate for each loan (check studentaid.gov for federal loan rates).
  3. 3Select a repayment plan: Standard (10-year), Graduated, Extended, or Income-Driven.
  4. 4View monthly payment, total interest, and payoff date for each plan.
  5. 5Add extra monthly payments to see how accelerated payoff reduces total interest.
  6. 6Compare refinancing scenarios: enter a new rate to see potential savings.

Student Loan Calculator — Frequently Asked Questions

How much will my student loan payment be?+

Under the Standard 10-year plan, monthly payment = Balance × [r(1+r)ⁿ] / [(1+r)ⁿ−1], where r is monthly rate and n is 120 months. For $30,000 at 5.5%: approximately $325/month. Under IDR plans like SAVE: 5–10% of discretionary income (income minus 225% of poverty level), which could be $0–$250 depending on income. Use the calculator to model your specific balance and rate.

How much will I pay in total on a student loan?+

On a $30,000 loan at 5.5% with 10-year Standard repayment: $39,024 total ($9,024 in interest). On an Extended 25-year plan: $58,500 ($28,500 interest). On IDR with 20-year forgiveness: total paid varies by income, but the forgiven balance may be taxable. Higher rates dramatically increase total cost: the same $30,000 at 7.5% costs $42,648 over 10 years.

Should I refinance my student loans?+

Refinance if: you have stable high income, good credit (720+), and can get 1%+ rate reduction. Don't refinance federal loans if: you're pursuing PSLF, may need IDR flexibility, or have uncertain income. Refinancing federal loans into private loans permanently removes federal protections. Compare rates without credit impact through Credible.com or similar aggregators.

What is the SAVE plan?+

SAVE (Saving on a Valuable Education) replaced REPAYE in 2023 as the most generous Income-Driven Repayment plan. Payments are 5% of discretionary income for undergrad loans (vs 10% for prior plans), the government covers 100% of unpaid interest, and remaining balance is forgiven after 20–25 years. Discretionary income = AGI minus 225% of federal poverty level ($33,975 for single filer in 2024).

How do extra payments help with student loans?+

Extra payments go directly to principal (specify this to your servicer), reducing the balance faster and the total interest charged. Adding $100/month to a $30,000 loan at 5.5% saves $2,836 in interest and pays off 3 years early. The avalanche method (extra payments toward highest-rate loan) saves the most mathematically, while the snowball method (smallest balance first) provides motivational quick wins.

Share this tool: