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Loan comparison calculator

Compare two fixed-rate loans from just the balance, rate, and term. See the payment difference, lifetime interest, payoff timing, and effect of any upfront costs.

Compare the financing, not the escrows. Taxes, insurance, HOA, LTV, and credit score are intentionally left out. They never block either amortization.

B vs A$130.07 less/moView details ↓

Your comparison

Put two loans side by side

What are you comparing?

Two purchase options Current loan vs refinance

Use the same loan amount for a clean rate-or-term comparison, or unmatch it when the balances differ.

Option ABaseline Loan amountFor an existing loan, use the current unpaid balance. Interest rateFixed note rate. Loan termUse whole years remaining. Upfront costs optionalCash-paid costs only; add financed costs to the loan amount.

Option BAlternative Use Option A's loan amountUncheck when Option B has a different balance. Loan amountMatched to Option A until you uncheck the control above. Interest rateFixed note rate. Loan termWhole-year, fully amortizing term. Upfront costs optionalCash-paid costs only; add financed costs to the loan amount.

Option B compared with Option A

$130.07 less / month

Comparison ready

Purchase options · $400,000 each · 30 years

Option A monthly P&I$2,528.27

Option B monthly P&I$2,398.20

Option B lowers monthly P&I by $130.07 and modeled total cost by $41,825.19; its $5,000.00 added upfront cost breaks even in month 39.

Interest over full payoff: $46,825.19 less with B
Total modeled cost: $41,825.19 less with B
Payoff timing: Same payoff timing
Simple cost break-even: Month 39

Option A total interest$510,177.95

Option B total interest$463,352.76

Option A modeled cost$910,177.95

Option B modeled cost$868,352.76

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Educational fixed-rate, fully amortizing estimate only. Principal-and-interest payments start from the loan amount, rate, and term entered. Taxes, insurance, HOA, mortgage insurance, rate changes, prepayment penalties, tax effects, and time value of money are not included. Total modeled cost is principal + interest + entered cash-paid upfront costs; it is not APR or a Loan Estimate. Simple break-even is extra upfront cost divided by the starting monthly P&I savings. For an existing loan, enter the current unpaid balance and remaining whole-year term. Verify actual terms and costs for the specific loan.

The balance path

Annual amortization, side by side

Both options are paid off after 30 years. The cumulative column shows how much less interest Option B has accrued.

Swipe sideways to compare every column.

Annual amortization comparison for Option A and Option B
Year	Option A			Option B			Cumulative interest difference
Year	Principal	Interest	Ending balance	Principal	Interest	Ending balance	Cumulative interest difference

Read the result correctly

The lowest payment is not always the lowest-cost loan.

Monthly P&IEscrows are intentionally excluded so the financing difference stays visible.

Interest over timeThe schedule starts from the balances and remaining terms you enter; interest already paid is not included.

Upfront costsEnter cash-paid costs only. They affect total modeled cost and the simple payment break-even, not amortization.