How to Use the Student Loan Payoff Calculator

This free calculator compares the two most popular debt-repayment strategies — Debt Snowball and Debt Avalanche — so you can see exactly how much interest and time each method costs (or saves) on your student loans.

Step-by-Step Guide

1. Enter Your Loans

Add every student loan you currently hold:

Loan name: Optional nickname (e.g. “Stafford”, “Private Grad PLUS”).
Balance: Current outstanding principal.
Interest rate: Annual percentage rate (APR).
Minimum payment: The required monthly payment for that loan.

Use the “＋ Add another loan” button for as many loans as you need. Remove any loan with the ✕ button.

2. Set Extra Monthly Payment

Enter any amount you can pay above the sum of all minimum payments. This extra is applied according to the chosen method each month.

3. Compare the Two Methods

Results update live. The calculator runs both strategies in parallel:

Snowball: Always directs the extra payment to the loan with the lowest remaining balance. Psychological wins come faster.
Avalanche: Always directs the extra payment to the loan with the highest interest rate. Mathematically optimal — lowest total interest.

4. Read the Results

Time to payoff: Months (and years) until every loan reaches zero.
Total interest: All interest paid under that method.
Total paid: Principal + interest.
Interest / months saved: How much Avalanche usually saves versus Snowball.
Chart: Remaining total debt over time for both methods.
Payoff order table: Which loan is eliminated first, second, etc., under each strategy.

Common Scenarios & Examples

Scenario: Three typical student loans

Goal: Decide whether the emotional boost of Snowball is worth the extra interest versus Avalanche.

Keep the default sample loans (or replace with your own).
Set Extra Monthly Payment to $150.
Watch the Results panel update automatically.

Sample starting point:

Loan A – $6,000 @ 4.5% (min $80)
Loan B – $12,000 @ 5.5% (min $120)
Loan C – $18,000 @ 8.2% (min $200)
Extra payment: $150

Avalanche almost always finishes with lower total interest; Snowball clears the first loan sooner.

When Snowball can still be the better choice

If staying motivated is the biggest risk of failure, the quicker early wins of Snowball may outweigh a modest interest difference.

Use the chart and the “months saved” figure to quantify the trade-off for your exact numbers.

Disclaimer & Limitations

Not Professional Advice: This calculator is an estimation and educational tool only. It does not constitute financial, tax or legal advice. Consult a qualified advisor or your loan servicer for decisions that affect your real loans.

Assumptions: Fixed interest rates, constant minimum payments, payments applied after monthly interest accrual, no fees, no forbearance, no income-driven repayment plans, no forgiveness programmes, and no early-payoff penalties.

Estimation Purposes Only: Real-world results vary with rate changes, payment timing, and any additional principal reductions or deferments.

Bug Reports and Suggested Improvements

Please email all suggestions for improvements and any bug reports to: studentloanpayoffcalc@personalfinances.me, thank you.

Student Loan Payoff Calculator

📋 Your Loans

📊 Results

❄️ Snowball Winner

🏔️ Avalanche Winner

📅 Payoff Order & Timeline