Compare two loan options side by side to find the most cost-effective choice for your budget. It helps loan applicants, financial planners, and individuals managing personal finances evaluate total interest, monthly payments, and overall costs. Use it to make informed borrowing decisions for mortgages, auto loans, or personal lines of credit.
💳 Loan Comparison Calculator
Enter details for two loan options to compare total costs, monthly payments, and interest charges.
Loan Option 1
Loan Option 2
How to Use This Tool
Follow these steps to compare two loan offers accurately:
- Gather all loan details for both options, including the principal amount, annual interest rate, loan term, payment frequency, and any upfront fees (origination, closing costs, etc.).
- Enter the details for Loan Option 1 in the first card, and Loan Option 2 in the second card. Use the dropdown to select payment frequency (monthly, bi-weekly, or weekly).
- Click the "Calculate Comparison" button to generate a side-by-side breakdown of costs.
- Review the results, including per-payment amounts, total interest, total payments, and upfront fees for each loan. The difference column shows how much you will save (or lose) with Loan 1 compared to Loan 2.
- Use the "Reset All" button to clear inputs and start a new comparison, or "Copy Results" to save the breakdown to your clipboard.
Formula and Logic
This calculator uses the standard amortization formula for fixed-rate loans to calculate per-payment amounts and total interest:
Periodic Payment (M) = P * [r(1+r)^n] / [(1+r)^n - 1]
- P = Principal loan amount
- r = Periodic interest rate (annual rate / 100 / payments per year)
- n = Total number of payments (loan term in years * payments per year)
Total interest is calculated as (periodic payment * number of payments) minus the principal. Total overall cost adds upfront fees to the sum of all periodic payments. For loans with 0% interest, payments are calculated as principal divided by number of payments.
Practical Notes
Keep these finance-specific factors in mind when comparing loans:
- Upfront fees (origination, application, closing costs) can significantly impact total cost, even if a loan has a lower interest rate. Always include these in comparisons.
- Bi-weekly payments reduce total interest and shorten loan terms because you make 26 payments per year instead of 12, equivalent to 13 monthly payments.
- Adjustable-rate loans (ARMs) are not supported by this calculator, as it assumes fixed rates for the entire term. For ARMs, compare the initial fixed-rate period separately.
- Tax deductions for mortgage interest may reduce the effective cost of a loan. Consult a tax professional to factor this into your decision.
- Longer loan terms lower per-payment amounts but increase total interest paid over the life of the loan.
Why This Tool Is Useful
Choosing between loan offers can be complex, as lenders often present different terms, rates, and fee structures. This tool eliminates guesswork by:
- Standardizing comparisons across different payment frequencies and fee structures
- Calculating true total cost, not just monthly payments
- Highlighting hidden savings (or costs) in upfront fees and interest charges
- Helping you align loan choices with your budget and long-term financial goals
It is useful for mortgage shoppers, auto loan applicants, personal loan borrowers, and financial planners advising clients on debt management.
Frequently Asked Questions
Does this calculator account for adjustable interest rates?
No, this tool only supports fixed-rate loans for the entire term. Adjustable-rate loans have fluctuating interest rates after an initial fixed period, which requires separate calculations for each rate change. Use this calculator to compare the initial fixed-rate period of an ARM to a fixed-rate loan.
Why do bi-weekly payments save money?
Bi-weekly payments split your monthly payment into two smaller payments every two weeks. Since there are 52 weeks in a year, you make 26 bi-weekly payments, equivalent to 13 full monthly payments. This extra payment each year reduces the principal faster, lowering total interest and shortening the loan term by several years.
Should I prioritize a lower interest rate or lower upfront fees?
It depends on how long you plan to keep the loan. If you will pay off the loan quickly (e.g., selling a home in 5 years), lower upfront fees may save more. For long-term loans, a lower interest rate usually saves more in total interest, even with higher upfront fees. Use this calculator to test both scenarios.
Additional Guidance
When comparing loans, always request a Loan Estimate from lenders, which standardizes key terms and fees for easy comparison. Check your credit score before applying, as higher scores qualify for lower interest rates. Avoid loans with prepayment penalties, which charge fees for paying off the loan early. If you are unsure which loan fits your budget, use the per-payment amount to test affordability alongside your monthly income and expenses.