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Loan Comparison Calculator: Compare Side-by-Side

Written by Calcida Team
Reviewed for accuracy and clarity
Last updated: April 2026

Compare two loans side-by-side to see which one saves you more money. Compare interest rates, terms, and fees.

This calculator is useful for borrowers comparing two loan offers side-by-side. You will typically enter Loan amount, Rate and term for Loan A, Rate and term for Loan B, Fees (optional).

The result represents monthly payments, total interest, and total cost comparison. If you are browsing similar tools, start with Loan Calculators or view the full calculators directory.

Also useful: Personal Loan Calculator: Payment & Interest, Auto Loan Calculator: Estimate Monthly Car Payments.

Loan Option A

Monthly Payment$489
Total Interest$4,349
Total Cost$29,349

Loan Option B

Monthly Payment$744
Total Interest$1,772
Total Cost$26,772

Comparison Results

Loan Option B is the cheaper overall loan, saving you $2,577 in total cost compared to Option A.

Option A also has a lower monthly payment by $255.

What should you do next?

Manage your loans with these additional calculators:

How This Calculator Works

A loan comparison calculator allows you to compare two loans side-by-side to see which one saves you more money over time.

The Loan Formula:

M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ]

  • M = Monthly payment
  • P = Principal loan amount
  • i = Monthly interest rate (annual rate / 12)
  • n = Number of months (loan term in years x 12)

Example Calculation:

If you borrow $25,000:
Option A: 6.5% interest for 5 years = $489.15/month ($29,349 total cost)
Option B: 4.5% interest for 3 years = $743.83/month ($26,778 total cost)
Option B saves you $2,571 in total cost!

Formula

Compare by monthly payment + total interest + total cost (APR when fees apply)
Where:
  • M = monthly payment from amortization formula

Example Calculation

Loan amount$25,000
Option A6.50% for 5 years
Option B4.50% for 3 years
Typical outcome
Option B costs less overall but has a higher monthly payment

How to Compare Loan Options Like a Pro

When comparing loans, don't just look at the monthly payment. A lower monthly payment might mean you're paying for a longer term, which can cost you thousands more in interest.

Key Metrics for Comparison

When using the calculator above, look at these three metrics:

  • Monthly Payment: Can you afford this every month? This is about cash flow.
  • Total Interest Paid: How much are you paying the lender for the privilege of borrowing? This is about long-term cost.
  • APR: Does the interest rate reflect the true cost including fees? Use our APR calculator if you're not sure.

The Trade-Off: Rate vs. Term

In the example above, Option B has a higher monthly payment ($743 vs $489) but a lower total cost ($26,778 vs $29,349). This is because the term is shorter (3 years vs 5 years).

  • Shorter Term: Higher monthly payment, lower total interest.
  • Longer Term: Lower monthly payment, higher total interest.
  • Lower Rate: Lower monthly payment AND lower total interest (all else being equal).

Check for Prepayment Penalties

Some loans charge a fee if you pay them off early. If you plan to make extra payments, ensure your loan is "open" and has no prepayment penalties. This allows you to use the debt payoff strategy effectively.

Frequently Asked Questions

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