Payment Calculator

Two Ways to Look at the Same Loan

Every installment loan ties together three things: how much you borrow, how long you take to pay it back, and what it costs you each month. Fix any two and the third falls out automatically — which is exactly why this page has two tabs instead of one. Fixed Term answers "if I commit to this many years, what's my payment?" Fixed Payments flips the question: "if this is what I can afford monthly, how long until I'm done?"

Choosing a Term

For big amortized loans like mortgages, the term you pick says a lot about your broader financial plan, not just your monthly budget. Someone with a shaky job outlook or a strong preference for predictability might lean toward a shorter term and a lower rate, even with healthy savings to fall back on. Someone else might deliberately stretch the term so the payoff date lines up with when Social Security or a pension kicks in.

The same trade-off shows up with car loans, where terms commonly run anywhere from 12 to 96 months. A longer term shrinks the monthly bill, which is tempting, but it almost always raises the total you pay once interest is added up — the shortest term you can comfortably afford is usually the cheapest one overall. It's worth running a few different term lengths through the calculator above before settling on one.

Paying Off a Fixed Monthly Amount

The Fixed Payments tab is built for a different question: given what you can actually pay each month, how long will it take? It's a natural fit for credit card debt, or for figuring out how much sooner you'd be debt-free by throwing extra money at a loan every month.

There's a catch worth knowing about: if the monthly payment you enter doesn't even cover that month's interest, the balance will never shrink — it'll just grow forever. If the calculator flags that, the fix is simple: borrow less, pay more each month, or find a lower rate.

Interest Rate vs. APR

These two numbers aren't the same thing, and the gap between them can run into real money on a large loan like a mortgage. The interest rate is just the price of borrowing the principal. The APR folds in extra loan costs too — things like origination fees, discount points, and closing costs — spreading them out over the life of the loan instead of charging them all upfront. If a loan has no extra fees at all, rate and APR are identical; otherwise APR will run a bit higher, and it's generally the more honest number for comparing the true cost of different loan offers.

Fixed vs. Variable Rates

Most common loans — standard mortgages, auto loans, student loans — lock in a fixed rate for the life of the loan. Variable-rate products (adjustable-rate mortgages, HELOCs, and some personal or student loans) instead track a benchmark, historically something like the Fed funds rate or LIBOR, and move with it.

Because the rate can change, so can the payment — a rate bump this month changes both this month's bill and the total interest projected over the rest of the loan. Many variable loans cap how high the rate can climb regardless of what the benchmark does, and lenders typically only reset the rate at fixed intervals spelled out in the loan contract, so a benchmark move doesn't necessarily show up immediately. As a rule of thumb, variable rates tend to work in the borrower's favor when the underlying index is trending down, and against them when it's climbing.

Credit cards can carry either type, and issuers aren't always required to warn you before a variable card rate goes up — so it's worth checking the terms, and borrowers with strong credit can sometimes negotiate a better rate just by asking.