Student Loan Payoff Calculator

Most healthcare careers start with debt. Physicians often graduate owing well over $200,000, dentists more, and nurses, pharmacists and PAs carry meaningful balances too. This calculator answers the questions people ask most: When will my loans be paid off, how much interest will I pay, and what happens if I pay a little extra?

What this calculator does

Enter your loan balance, interest rate and monthly payment. The calculator works through the loan one month at a time — adding interest, subtracting your payment — until the balance reaches zero. It reports:

• how long payoff will take,
• the total interest and total paid,
• how much interest an extra monthly payment saves, and
• the payment you'd need to be debt-free in exactly 10 years.

The chart shows your balance at the end of each year, so you can see the debt shrink.

The formula in plain English

Each month, your lender charges interest on what you still owe: balance × (annual rate ÷ 12). Your payment covers that interest first, and whatever is left reduces the balance. Early on, most of each payment goes to interest. As the balance falls, more of the payment goes to principal, which is why payoff speeds up near the end.

The 10-year payment uses the standard loan formula: payment = balance × r ÷ (1 − (1 + r)^−120), where r is the monthly rate.

An extra payment goes straight to principal. That lowers next month's interest, which means more of the following payment goes to principal too. The effect compounds — that's why small extra payments save a surprising amount.

A worked example

Jordan is a hospitalist with $180,000 in loans at 6.8%, paying $2,500 a month and adding $500 extra.

• Payoff takes about 6.2 years.
• Total interest is about $40,600.
• The extra $500 a month saves about $11,300 in interest compared with paying $2,500 alone.
• To be debt-free in exactly 10 years, the payment would be about $2,071.

If Jordan's loans were at 4.5% instead, the same payment would finish sooner and cost far less in interest — one reason refinancing appeals to people who are sure they won't use PSLF.

Why it matters at each career stage

If you're: Student

Every dollar you don't borrow is a dollar you never pay interest on. Use this calculator to see what your balance at graduation will cost you over 10 years, and compare that with the salary you expect.

If you're: Resident / fellow

During training, most people choose an income-driven plan, so payments are small. If you work for a nonprofit hospital, check PSLF before paying extra. If you don't, even modest extra payments during training can stop your balance from growing.

If you're: Employed

This is the payoff window. Your income has jumped, and every extra dollar has a big effect. Decide on a target date — five years is a common goal — and set an automatic payment that gets you there.

If you're: Practice owner

Practice owners juggle business loans, equipment financing and personal debt. Compare your student loan rate with your practice loan rate and with your expected return on retirement contributions before deciding where extra cash goes.

Tips for using your results

Pick a payoff date, then work backward. It's easier to stay motivated with a clear finish line.

Automate it. Many servicers offer a small rate discount for autopay.

Revisit after raises. Putting part of each raise toward your loans speeds payoff without cutting into your current lifestyle.

Know your path first. If you might qualify for PSLF or other forgiveness, extra payments could be money you didn't need to spend. Start with the PSLF calculator, and see the debt payoff planner if you have several debts.