Student Loan Payoff Calculator: Pay Off Faster With Extra Payments
This student loan payoff calculator shows how long it will take to pay off your student loans and how much an extra monthly payment could save. Enter your balance, interest rate, monthly payment and any extra amount.
Quick answer
A $30,000 student loan at 6% paid at $350 a month takes about 9 years and 5 months and costs about $9,271 in interest. Adding $100 a month cuts it to about 6 years and 10 months and saves about $2,688.
How to use the student loan payoff calculator
- Loan balance and interest rate: from your loan servicer. If you have several loans, you can enter the total and an average rate for a quick estimate.
- Monthly payment: your current payment. The standard 10-year payment on $30,000 at 6% is about $333.
- Extra payment: what you could add each month.
What extra payments do
| $30,000 at 6% | Monthly payment | Time to pay off | Total interest |
|---|---|---|---|
| Standard 10-year plan | $333.06 | 10 years | about $9,967 |
| Paying $350 | $350 | 9 years, 5 months | $9,271 |
| Paying $450 | $450 | 6 years, 10 months | $6,583 |
Each extra step speeds up your student loan payoff. On the same $30,000 at 6%:
| Extra each month | Paid off in | Total interest |
|---|---|---|
| $0 | 10 years | $9,967 |
| $50 | 8 years, 4 months | $8,163 |
| $100 | 7 years, 2 months | $6,921 |
| $200 | 5 years, 7 months | $5,317 |
Student loan payoff calculator examples by balance
Here is what an extra $100 a month does on a standard 10-year plan at different balances and rates:
| Balance and rate | Standard payment | Standard interest | With +$100: time | With +$100: interest | Saved |
|---|---|---|---|---|---|
| $10,000 at 5.5% | $108.53 | $3,023 | 4 years, 7 months | $1,318 | $1,705 |
| $30,000 at 6% | $333.06 | $9,967 | 7 years, 2 months | $6,921 | $3,046 |
| $60,000 at 7% | $696.65 | $23,598 | 8 years, 4 months | $19,255 | $4,343 |
| $100,000 at 7.5% | $1,187.02 | $42,442 | 8 years, 11 months | $37,324 | $5,118 |
What this means for you: on a small balance, $100 extra can cut the loan in half. On a large one it still saves thousands, but you may need a bigger extra payment, or a lower rate, to change the timeline much.
One-time payment vs monthly extra
A $2,000 lump sum today (from a bonus or tax refund) on the $30,000 loan, keeping the $333.06 payment, ends the loan about 10 months early and saves about $1,552. A one-off payment helps your student loan payoff most when it is made early in the loan.
When you pay extra, ask your servicer to apply it to the principal of the loan with the highest rate, not to future payments.
Several student loans: which to pay first
Most graduates have several loans with different rates. Say you have $8,000 at 4.5%, $12,000 at 6.5% and $10,000 at 7.5%, and you pay the standard amounts plus $200 extra a month ($537.87 in total):
| Where the extra $200 goes | Debt-free in | Total interest |
|---|---|---|
| Highest rate first (avalanche) | 5 years, 6 months | $5,228 |
| Smallest balance first (snowball) | 5 years, 7 months | $5,925 |
Paying the highest rate first saves about $697 here, and it is the fastest student loan payoff order in most cases. Ask your servicer to apply extra payments to that specific loan’s principal.
Refinancing: when the math works
Refinancing $30,000 over 10 years from 7% to 5% lowers the payment from $348.33 to $318.20 and the total interest from about $11,799 to about $8,184, a saving of roughly $3,615.
| Pros of refinancing | Cons of refinancing |
|---|---|
| Lower rate and lower total interest | Federal loans lose access to federal repayment plans and protections |
| One payment instead of several | You need good credit and stable income to qualify |
| You can choose a shorter term | Variable-rate offers can rise later |
Run both rates through the student loan payoff calculator before you apply. For private loans, refinancing is mostly a rate decision. For federal loans, weigh the protections first; the current rules are on StudentAid.gov.
Repayment options to know
- Federal loans offer several repayment plans, including income-driven options that can lower payments. Rules change, so check StudentAid.gov.
- Refinancing federal loans into a private loan can lower the rate but removes federal protections.
- Unpaid interest can sometimes be added to the balance (capitalized), making the loan grow.
What this student loan payoff calculator means for you
- Small extra payments can save thousands and years.
- Federal protections can be valuable; weigh them before refinancing.
- If you also have credit card debt, that is usually more expensive to keep.
Common mistakes with student loan payoff
- Letting extra payments go to future months. Without instructions, a servicer may advance your due date instead of cutting principal.
- Paying extra on the lowest-rate loan. The student loan payoff calculator shows the highest rate saves the most.
- Ignoring capitalized interest. Unpaid interest added to the balance means you pay interest on interest.
- Skipping an employer 401(k) match to pay loans faster. A match is usually worth more than the interest saved.
- Refinancing federal loans without checking what you give up.
Frequently asked questions
How long does it take to pay off $30,000 in student loans?
About 10 years on a standard plan at 6% ($333 a month). Paying $450 a month cuts it to under 7 years.
Should I pay off student loans early?
If you have no high-interest debt and an emergency fund, extra payments can save interest. Compare the rate with what else you could do with the money.
Do extra payments go to principal?
Ask your servicer to apply extra amounts to principal; otherwise they may be treated as early future payments.
Is student loan interest tax-deductible?
Some interest may be deductible within IRS limits and income rules. Check IRS guidance.
Where can I see my federal loans?
At StudentAid.gov, which lists your loans, servicer and repayment options.
How accurate is this student loan payoff calculator?
It is a close estimate based on a fixed rate and monthly interest. Most federal loans charge simple daily interest, so your servicer’s figures can differ slightly.
Is it better to make one big payment or extra monthly payments?
Mathematically, money paid earlier saves more interest. A lump sum today beats the same amount spread over the next year, but steady monthly extras are easier to keep up.
Related guides and calculators
- Loan payment calculator
- Pay off debt or save first?
- Debt snowball vs avalanche calculator
- Amortization explained
Sources
This guide is for educational purposes only and is not financial advice. The figures are estimates before taxes, fees and inflation, and real rates, returns and rules change over time.
