Debt Consolidation Calculator
Consolidate multiple high-interest credit cards, loans, or medical bills into a single monthly payment to see how much money, interest, and payoff time you can save.
How to Use This Calculator
- Itemize Your Current Debts: Enter each credit card, personal loan, or medical balance along with its annual interest rate (APR) and current monthly payment. Click "+ Add Another Debt" to include up to 6 separate accounts.
- Review Your Combined Debt Profile: The calculator automatically aggregates your numbers to show your total outstanding principal balance, combined monthly payments, and overall blended average interest rate.
- Enter Your Proposed Consolidation Loan Terms: Input your new loan's fixed APR, desired repayment term (e.g., 24, 36, 48, or 60 months), and any upfront lender origination fees.
- Analyze Your Savings and Payoff Horizon: Compare your current multi-debt trajectory against the consolidation loan to see your immediate monthly cash flow change, total interest saved, and exact debt-free date.
The Formula
Evaluating a debt consolidation loan requires three distinct financial calculations: computing your current blended interest rate, simulating your existing payoff schedule, and calculating fixed installment loan amortization.
1. Weighted Blended Interest Rate (APR)
Your blended rate represents the true weighted average annual cost of your current debts based on the balance size of each account:
2. Consolidation Loan Monthly Payment (Amortization)
The required monthly payment for a fixed-rate consolidation installment loan is derived using standard loan amortization:
Where P is the new loan principal (total balance plus any financed origination fees), r is the monthly interest rate (annual APR ÷ 12), and n is the total number of repayment months.
3. Net Lifetime Savings
Example: Consolidating 3 High-Interest Cards
Imagine a borrower carrying $16,000 in total credit card balances across three cards with high interest rates:
- Card 1: $8,000 balance @ 24.0% APR ($250/mo payment)
- Card 2: $5,000 balance @ 22.0% APR ($160/mo payment)
- Card 3: $3,000 balance @ 19.0% APR ($100/mo payment)
Current Trajectory: The borrower pays $510.00/month with a blended APR of 22.44%. At these fixed payments, it takes 52 months (4 years 4 months) to become debt-free, racking up $8,493.31 in total interest ($24,493.31 total cash paid).
Consolidation Offer: The borrower consolidates all three cards into a 48-month personal loan at 10.50% APR with a 3.0% origination fee ($480) rolled into the loan principal ($16,480 total borrowed).
- New Monthly Payment: $421.94 per month (+$88.06/month saved in cash flow).
- New Total Interest: $3,773.30 over 48 months.
- Net Lifetime Savings: $8,493.31 - ($3,773.30 + $480 fee) = $4,240.01 saved.
- Debt-Free Horizon: Debt-free 4 months sooner, with zero credit card juggling.
Frequently Asked Questions
How does a debt consolidation calculator work?
A debt consolidation calculator aggregates your individual debts, balances, interest rates, and monthly payments to determine your weighted blended APR and current payoff trajectory. It then amortizes a new single consolidation loan at your proposed interest rate and term, comparing monthly payments and total lifetime interest side-by-side to show your exact financial savings.
Does debt consolidation reduce the total amount I owe?
No. A consolidation loan does not reduce your existing principal debt balance. Instead, it replaces multiple creditor balances with a single new loan, reducing the interest rate and combining payments into one installment to save you money on interest and accelerate debt payoff.
Why is my new monthly payment lower, but my total interest higher?
If you consolidate into a loan with a significantly longer repayment term (e.g., stretching debts from 2 years to 5 or 7 years), your required monthly installment will drop, but the interest has much longer to accrue, which can increase the total lifetime interest paid over the loan term.
Can I use a personal loan for credit card debt consolidation?
Yes, personal loans are the most common tool for credit card consolidation. Because unsecured personal loans typically offer fixed APRs between 8% and 15% compared to credit card rates often exceeding 22% to 30%, consolidating can dramatically reduce your finance charges and establish a fixed, guaranteed debt-free payoff date.
What fees should I look out for when calculating consolidation costs?
The primary fee to evaluate is the loan origination fee, which typically ranges from 1% to 6% of the borrowed amount. You should also verify that your existing loans do not have prepayment penalties and ensure that any upfront fees are outweighed by your total lifetime interest savings.