Credit Cards & Debt

Cost-of-Debt Calculator

Combine your debts into one picture: total balance, blended interest rate and what that debt costs you in interest each month.

Inputs

Debt 1 — balance

Debt 1 — rate

Debt 2 — balance

Debt 2 — rate

Debt 3 — balance

Debt 3 — rate

Total monthly payment

Estimates only. Change any value to recalculate instantly.

Blended interest rate 12.18% on $28,000 of total debt

Total debt $28,000

Blended (weighted) rate 12.18%

Interest per month $284.17

Interest per year $3,410

Debt by balance

Debt 1 (22%) $8.0k
Debt 2 (7%) $15k
Debt 3 (12%) $5.0k

Your debt costs about $284.17 a month in interest at a blended 12.18% rate. Paying $900.00/mo clears it in about 4 years — target the highest-rate balance first to do it faster.

Payoff at $900.00/mo (blended 12.18%)View table

Year	Paid	Principal	Interest	Balance
1	$10,800	$7,817	$2,983	$20,183
2	$10,800	$8,824	$1,976	$11,359
3	$10,800	$9,960	$840	$1,399
4	$1,419	$1,399	$19	$0

How this calculator works

This calculator runs entirely in your browser — nothing you enter is sent anywhere, and there is no sign-up. Change any input and the result, breakdown, and schedule update instantly.

Rate and cost fields are pre-filled with current benchmarks (Federal Reserve / Freddie Mac via FRED (St. Louis Fed)), so your first result is already realistic — replace them with your own quote to see your numbers. To weigh one option against another, use the loan comparison calculator.

Common questions

Is this calculator free, and do I need to sign up?

Yes and no — it is completely free and asks for no account or personal details. Every calculation happens in your browser, so nothing you type is stored or sent to us.

How accurate are the results?

The math is exact for the inputs you give it, but the defaults are national benchmarks — your real rate, fees, taxes, and insurance will differ. Treat the result as a close estimate to refine with a real quote.