Interest Savings Calculator
Compare two payoff scenarios side by side — different balances, rates, or payments — to see exactly how much you'd save.
Scenario A
Scenario B
How the Interest Savings Calculator works
This calculator runs two independent amortization scenarios — Scenario A and Scenario B — each with its own balance, interest rate, and monthly payment, then compares the total interest and payoff time for both. It's built for open-ended "what if" comparisons: your current card versus a balance transfer offer, one loan quote versus another, or simply two different payment amounts you're weighing.
Scenario B result = amortize(Balance B, APR B, Payment B)
Savings = Interest A − Interest B
Common ways to use this calculator
- Refinance comparison: your current loan's numbers vs. a new offer's rate and payment.
- Balance transfer comparison: your card's current terms vs. a transfer card's ongoing rate (for the transfer fee and promo-period math specifically, use the Balance Transfer Calculator).
- Payment strategy comparison: a smaller payment today vs. a larger payment you could commit to.
Frequently Asked Questions
The Extra Payment Calculator always compares the same loan at its current payment versus that same payment plus a specific extra amount. The Interest Savings Calculator is more general — it compares two completely independent scenarios, which can have different balances, rates, and payments, such as your current card versus a refinance or balance transfer offer.
Common uses include comparing a current credit card to a balance transfer or refinance offer, comparing two different loan quotes, or comparing two payment amounts you're considering committing to.
If Scenario B has a lower monthly payment, it can take longer to pay off even at a lower interest rate, which sometimes results in similar or higher total interest. The calculator accounts for both the rate and the payoff time so you see the true total cost.
No — this tool compares pure interest cost based on balance, rate, and payment. For balance transfer offers that include a transfer fee and a promotional period, use the dedicated Balance Transfer Calculator, which accounts for fees directly.