Loan Comparison Calculator

Loans & Debt Calculators

Loan Comparison Calculator

Two loan offers rarely look identical — one has a lower rate, the other a shorter term, and it’s genuinely hard to tell which one actually costs less just by glancing at them. Add as many offers as you’re comparing and see the real difference, in dollars, not just percentages.

Currency

$0 difference between cheapest and most expensive option

Total amount paid over time

Why the lower monthly payment isn’t always the better deal

Imagine you’re buying a used car and two dealerships offer to finance the same $20,000. Dealership A offers 6.5% over 5 years. Dealership B offers a “better-sounding” 4.9%, but stretches it to 6 years. B’s monthly payment looks smaller, so it feels like the win — but a longer term means you’re paying interest for an extra 12 months, and that can quietly erase the advantage of the lower rate. The only way to know for sure is to compare the total cost, not just the monthly number.

M = P × r(1+r)ⁿ(1+r)ⁿ − 1

M = monthly payment · P = loan amount · r = monthly interest rate (annual rate ÷ 12) · n = total number of monthly payments

Back to the car example: Loan 1 ($20,000 at 6.5% for 60 months) comes to a monthly payment of about $391, totaling roughly $23,460 — about $3,460 in interest. Loan 2 ($20,000 at 4.9% for 72 months) has a smaller monthly payment of about $318, but because it runs a year longer, the total cost is roughly $22,896 — about $2,896 in interest. In this case, Loan 2 is actually the cheaper loan overall and has the lower monthly payment — but that’s not guaranteed. Stretch it far enough, and a lower rate stops being enough to save money.

What actually matters when comparing loans

Three things drive the real cost: the interest rate, the term length, and any upfront fees. A lower rate helps, but a longer term fights against it by adding more months of interest. If any loan includes an origination fee, processing fee, or “points,” add that directly to the total cost — it’s real money leaving your pocket even though it’s not part of the monthly payment.

Frequently asked questions

Should I always choose the loan with the lower total cost?

Usually, yes — but not always. If your monthly budget is tight, a slightly higher total cost with a lower, more comfortable monthly payment can be the more realistic choice. The right answer depends on your cash flow, not just the math.

What about fees or APR — should I include those?

Ideally, yes. This calculator compares interest rate and term directly; if a lender quotes an APR (which already includes certain fees) rather than a plain interest rate, use the APR here for the most accurate comparison.

How many loans can I compare at once?

You can add up to 6 offers side by side using the “Add another loan” button — useful if you’re shopping around and got quotes from several lenders.

Can I use this for a mortgage, car loan, or personal loan?

Yes — the math behind a standard fixed-rate loan is the same regardless of what it’s for. Just keep in mind mortgages often carry extra costs (taxes, insurance, closing costs) not reflected here.

Want to see one loan’s full monthly breakdown?

Try the EMI Calculator or Debt Payoff Calculator next.

EMI Calculator Debt Payoff Calculator Back to Toolkit