Side-by-side financing math
Loan option comparison calculator
For the default $50,000 project, Option A has less total interest. Compare payment pressure separately from lifetime borrowing cost.
| Measure | Option A | Option B |
|---|---|---|
| Monthly payment | $736.43 | $574.12 |
| Total interest | $11,860.12 | $18,894.40 |
| Total paid | $61,860.12 | $68,894.40 |
Monthly-payment difference: $162.31. Interest difference: $7,034.28.
How the comparison works
Each column uses the fixed-rate amortization formula independently: principal × monthly rate × (1 + monthly rate)months ÷ ((1 + monthly rate)months − 1). A lower payment can still carry more total interest when its term is longer.
What is excluded
The comparison excludes origination fees, closing costs, insurance, taxes, prepayment penalties, and variable-rate changes. Enter an APR that already reflects lender fees when comparing actual disclosures.