Thy LogoThy Calculator

Loan Comparison Calculator

Enter details for two different loans side-by-side to compare monthly repayments, total interest paid, payoff dates, and terms instantly.

Side-by-Side Loan Comparison

Compare two different loan structures instantly to see which serves you better.

Loan Option A

$
%
yrs

Loan Option B

$
%
yrs

Comparison Table

MetricsOption AOption B
Monthly P&I Payment$1,580.17$2,177.77
Total Interest Paid$318,861.22$141,998.31
Total Repayment Cost$568,861.22$391,998.31
Payoff Date
Total Term Payments360 months180 months

Payoff Curves Comparison

Option AOption B
StartPayoff Curve over TimeFinish

Why Compare Loans Side-by-Side?

Choosing a loan is one of the most significant financial commitments you will make. Lenders often present loans with differing interest rates, compounding frequencies, closing costs, and terms.

Comparing loans side-by-side lets you see beyond the initial monthly payment quote and analyze the **total lifetime interest cost** of the loan. A loan with a slightly lower monthly payment might cost thousands of dollars more over time due to an extended term or differing compounding schedules.

15-Year vs. 30-Year Mortgage Comparison

The most common comparison home buyers make is between a 15-year fixed-rate mortgage and a 30-year fixed-rate mortgage. Here is the trade-off:

  • 30-Year Mortgage: Offers lower monthly payments, which increases borrowing power and provides flexibility in your monthly household budget. However, you pay interest for an extra 15 years, which significantly increases the total repayment amount.
  • 15-Year Mortgage: Features higher monthly payments but typically comes with a lower interest rate from lenders. You build equity in your home twice as fast and pay a fraction of the total interest.

How Small Interest Rate Differences Accumulate

Lenders often negotiate interest rates down to fractions of a percent (e.g. 6.5% vs 6.25%). While a **0.25% interest rate drop** seems negligible, on large loans like a mortgage, the compounding impact is massive.

For example, on a **$300,000** 30-year mortgage:

  • At 6.50% interest, your monthly payment is $1,896.20, and you pay $382,633 in total interest.
  • At 6.25% interest, your monthly payment drops to $1,847.15, and you pay $364,976 in total interest.
  • A tiny 0.25% difference saves you **$17,657** over the life of the mortgage!