Compare Two Loans Side by Side
Enter details for each loan to compare monthly payment, total interest, and total cost including fees. You can also compare costs over a shorter time horizon if you plan to refinance, sell, or pay off early.
Loan A
Loan B
This tool uses a standard fixed-rate amortization model with monthly payments. Results are estimates and do not include taxes, insurance, late fees, or variable-rate changes.
Why comparing loans matters more than most people think
Most borrowers focus on one number: the monthly payment. That makes sense—your monthly budget is real and immediate. But the cheapest monthly payment is often not the cheapest loan. A longer term can lower your payment while dramatically increasing your total interest cost. On the other hand, a loan with a slightly higher monthly payment might save you thousands over time.
A good loan comparison should answer at least three questions: What will I pay each month? How much interest will I pay in total? What is my true out-of-pocket cost when fees are included? This calculator helps you evaluate all three at once.
How to use this comparing loans calculator
1) Enter the basic numbers for each loan
- Loan amount: the amount borrowed
- Interest rate (APR): yearly interest rate
- Term: number of years to repay
- Upfront fees: origination fees, points, closing costs, or lender charges
2) Add a time horizon if needed
If you think you may pay off early, refinance, or sell the asset, use a horizon in months. The calculator then estimates each loan's effective cost by combining what you've paid so far with what you'd still owe. This is useful for comparing short-hold strategies.
3) Review both full-term and horizon-based recommendations
Full-term comparison tells you which loan is cheaper if you keep it until paid off. Horizon comparison tells you which loan is cheaper for your expected holding period. Those answers can be different.
What to compare besides interest rate
APR vs. simple rate
A lower nominal interest rate does not always mean a lower total borrowing cost. High upfront fees can erase rate savings, especially if you keep the loan for a short time.
Loan term trade-offs
Shorter terms usually mean higher monthly payments but lower lifetime interest. Longer terms reduce monthly pressure but can cost much more overall. Choose based on both affordability and total cost.
Fees and break-even timing
If Loan B has higher fees but lower monthly payment, ask: how long until monthly savings recover extra fees? If you won't keep the loan that long, the "better rate" loan may still be the worse deal.
Common mistakes when comparing loans
- Comparing only monthly payment
- Ignoring origination or closing fees
- Assuming you'll keep the loan full term when history suggests otherwise
- Forgetting prepayment penalties or refinance costs
- Not stress-testing your budget with a slightly higher payment
A practical decision framework
When two loans are close, use this simple framework:
- Step 1: Confirm both payments fit your monthly budget comfortably.
- Step 2: Compare total cost (including fees) over the full term.
- Step 3: Compare effective cost over your realistic time horizon.
- Step 4: Factor in flexibility—prepayment options, penalty rules, and lender service quality.
Final thoughts
Loan decisions should be data-driven, not emotionally driven. The right loan is not always the one with the lowest advertised rate, and it's not always the one with the smallest monthly payment. It's the one that matches your cash flow, your timeline, and your long-term cost goals.
Use this calculator as your first pass. Then verify final numbers with lender disclosures before signing. A careful comparison can save you hundreds—or thousands—without changing anything else in your financial life.