Loan Comparison Calculator
Compare loans by monthly payment, total interest, and DTI ratio. Enter your details below to see which option works for you.
Last updated: January 2026
Loan Comparison Calculator
How to compare loans effectively
When comparing loans, look beyond the monthly payment. A lower monthly payment might mean a longer term and more total interest. This calculator shows you the full picture: monthly payment, total interest paid, and your debt-to-income ratio.
Your DTI ratio is one of the most important factors lenders consider. A DTI below 36% is generally considered good, 36-49% needs attention, and above 50% makes it hard to get approved.
What affects your loan cost?
Your interest rate is determined by your credit score, loan term, and market conditions. A shorter term means higher monthly payments but less total interest. Use this calculator to find the balance that works for your budget.
This is an estimate. Actual results vary.
More guidance for the Loan Comparison Calculator
APR, fees, and total cost
The cheapest loan is not always the one with the lowest monthly payment. A longer term can reduce the payment but increase total interest. Origination fees, points, and closing costs can make a lower stated rate more expensive. Compare total repayment, not just the payment amount.
The payment formula
Installment loans use the same amortization logic as mortgages: payment depends on principal, monthly rate, and number of payments. Extra fees should be included in the real cost even if they are paid upfront. If you are comparing home loans, also run the numbers in the mortgage calculator.
Common mistakes
Borrowers often compare only payment size, ignore prepayment penalties, overlook variable-rate resets, or forget that refinancing restarts the term. Another mistake is comparing loans with different assumptions, such as one quote with taxes and insurance included and another without them.
When to consult a professional
Ask a loan officer, credit counselor, or financial advisor when a loan includes balloon payments, variable rates, collateral, business guarantees, or complex fees. The calculator can make tradeoffs visible, but it cannot judge contract risk.
Practical example
The safest way to use the Loan Comparison Calculator is to run one realistic case, then change one assumption at a time. Start with your current numbers, save or write down the result, then test a conservative scenario and an optimistic scenario. This makes the tool more useful than a single answer because you can see which input actually drives the outcome. For money, tax, legal, or health-adjacent decisions, the range is often more important than the exact midpoint.
Decision checklist
Before relying on any calculator result, check whether the inputs match your real situation, whether rates or rules have changed this year, whether the result excludes fees or local rules, and whether a professional review would be cheaper than a mistake. Use the result as a planning estimate, then verify critical numbers against official documents, lender quotes, payroll records, contracts, or professional advice.