Introduction
A loan comparison calculator helps you evaluate two different loan options side by side, showing exactly how much you save (or lose) by choosing one over the other. Whether you are comparing offers from different lenders, deciding between a shorter term with higher payments versus a longer term with lower payments, or evaluating a refinance opportunity, this calculator provides clear, numeric comparisons. The tool calculates monthly payment, total interest paid, and total payment (principal + interest) for each loan using standard amortization formulas. It then shows the net savings of choosing the better option. This calculator is for anyone shopping for mortgages, auto loans, personal loans, student loans, or refinancing existing debt. Toolraxy provides this loan comparison calculator to help you make data-driven borrowing decisions and avoid choosing loans that cost thousands more in interest.
How to Use
Select your currency from 30+ options (USD, EUR, GBP, JPY, etc.)
Enter Loan Option A details: amount, interest rate (APR), and term in years
Enter Loan Option B details: amount, interest rate (APR), and term in years
Click Calculate or watch results update automatically
Compare monthly payments side by side
Compare total interest paid for each loan
Compare total payment (principal + interest)
View the savings amount showing which loan is cheaper
How the Tool Works
The loan comparison calculator uses the standard loan amortization formula for each loan independently, then compares results.
Step 1: Calculate Monthly Payment for Each Loan
Monthly interest rate = Annual rate ÷ 100 ÷ 12
Total payments = Term in years × 12
If monthly rate = 0:
Monthly payment = Principal ÷ Total payments
If monthly rate > 0:
Monthly payment = P × [r(1+r)^n] ÷ [(1+r)^n − 1]
Where:
P = Principal (loan amount)
r = Monthly interest rate
n = Total number of payments
Step 2: Calculate Total Payment for Each Loan
Total payment = Monthly payment × Total payments
Step 3: Calculate Total Interest for Each Loan
Total interest = Total payment − Principal
Step 4: Calculate Savings
Savings = Total payment (Loan A) − Total payment (Loan B)
If savings > 0: Loan B is cheaper by that amount
If savings < 0: Loan A is cheaper by that amount
If savings = 0: Loans have equal total cost
Validation Behavior:
Edge Cases:
0% APR: Monthly payment = Principal ÷ Months (simple division)
Different loan amounts: Comparison still valid (shows which costs less)
Different terms: Comparison accounts for different timeframes
JPY currency: No decimal places
FAQs
How accurate is this loan comparison calculator?
This calculator uses standard loan amortization formulas identical to those used by banks and lenders. Results match lender quotes within rounding. For accurate comparison, include fees by adding them to loan amount.
What is the difference between interest rate and APR?
Interest rate is base borrowing cost. APR includes interest + fees. This calculator uses interest rate—add estimated fees to loan amount for more accurate APR comparison.
Should I compare monthly payment or total cost?
Both. Lower monthly payment often means longer term and higher total interest. Use this calculator to see both metrics—choose based on your budget (monthly) and long-term financial goals (total cost).
Can I compare a fixed-rate and variable-rate loan?
This calculator assumes fixed rates for both loans. For variable-rate comparison, use the initial rate but understand that future payments may increase—variable rates carry risk.
What is the minimum credit score for loan comparison?
Comparison is useful for any credit score. However, lower scores (below 620) may have limited options. Improve credit before borrowing if possible—every 50 points saves 1-2% on APR.
Should I compare loans with different terms?
Yes, but understand the trade-off: a 3-year loan and 5-year loan serve different needs. Compare total interest—if you can afford higher payment, shorter term saves money.
Does this calculator include prepayment penalties?
No. Prepayment penalties (1-3% of remaining balance) would reduce savings from early payoff. Ask lenders about prepayment penalties before signing.
How many lenders should I compare?
Compare at least 3-5 lenders. Each additional comparison typically saves 0.25-0.5 percentage points on APR. Online marketplaces can compare 5+ lenders simultaneously.
