Debt Consolidation Calculator
Calculate the monthly payment and total interest on a consolidation loan and compare the full cost against continuing minimum payments on existing debts.
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Enter your values above to see the results.
Tips & Notes
- ✓Calculate the break-even point: how many months until the lower monthly payment offsets the consolidation loan fees — if you plan to pay off debt aggressively, fees may eliminate the benefit.
- ✓Consolidation only helps if the new rate is meaningfully lower (at least 3-5%) than the weighted average rate of existing debts — consolidating at a similar rate changes the structure without changing the economics.
- ✓Do not use credit cards after consolidation — clearing card balances through a consolidation loan while continuing to charge creates both the loan and new card debt simultaneously.
- ✓Shorter loan terms cost less total interest — choose the shortest term with a monthly payment you can reliably sustain, not the longest term with the lowest payment.
- ✓A home equity loan or HELOC typically offers lower rates than a personal consolidation loan but converts unsecured debt to secured — default risk now includes your home.
- ✓Check your credit score before applying — consolidation loans at 10-12% are typically available to borrowers with credit scores above 700; below 650, rates may be high enough to eliminate the benefit.
Common Mistakes
- ✗Consolidating and then accumulating new credit card balances — this is the most common and most expensive consolidation mistake, resulting in both a loan payment and new card debt.
- ✗Extending the repayment term so far that total interest paid exceeds the original high-rate minimum payment path — always compare total interest, not just monthly payment.
- ✗Not including origination fees and closing costs in the true cost of the consolidation loan — a 3% origination fee on $18,000 is $540 that must be added to the total cost comparison.
- ✗Consolidating student loans with other debt — federal student loans carry specific protections and income-driven repayment options that are permanently lost if consolidated into a private loan.
- ✗Treating a lower monthly payment as savings — the lower payment is only savings if it comes from a lower rate, not from extending the term while paying the same or more total interest.
- ✗Applying for multiple consolidation loans simultaneously — each application triggers a hard credit inquiry that reduces the credit score, potentially affecting the rate offered by subsequent lenders.
Debt Consolidation Calculator Overview
A debt consolidation calculator evaluates whether replacing multiple high-rate debts with a single lower-rate loan reduces your total cost. It shows the new monthly payment, total interest under the consolidation loan, and how these figures compare to the status quo of minimum payments on existing balances.
Consolidation saves money only when the new rate is meaningfully lower than existing rates and the term does not extend repayment so far that you pay more total even at the lower rate.
What each field means:
- Total Debt — the combined balance of all debts being consolidated into one loan
- Interest Rate — the APR on the new consolidation loan; personal loan rates range from 7-25% depending on credit
- Loan Term — the repayment period for the consolidation loan; shorter terms cost less interest but require higher payments
- Down Payment — not applicable for consolidation; the full debt amount is consolidated
What your results mean:
- Monthly Payment — the fixed monthly payment on the consolidation loan
- Loan Amount — the total consolidated balance
- Total Paid — all payments over the full loan term
- Total Interest — interest paid above the original consolidated balance
- Interest-to-Principal — dollars of interest per dollar of original debt
Example — $18,000 total debt, 12% consolidation rate, 48-month term:
Consolidation loan: $18,000 at 12% for 48 months Monthly payment: $474 Total paid: $22,752 Total interest: $4,752 Versus status quo (assume 22% average APR on minimum payments): Minimum payments: approximately $540/month declining Payoff time: 8-10 years Total interest: $12,000-$15,000 Consolidation saves approximately $8,000-$10,000 in interest. Consolidation monthly payment ($474) is lower than current minimums ($540) — cash flow also improves.
EX: $18,000 consolidation at 12% — how term affects total interest 24-month term: $848/month, $2,352 total interest 36-month term: $598/month, $3,528 total interest 48-month term: $474/month, $4,752 total interest 60-month term: $400/month, $6,000 total interest Shorter terms cost less interest but require higher monthly payments. Choosing 60 months over 24 months costs $3,648 more in interest for $448 less per month.
Monthly payment by loan amount and rate — 48-month term:
| Loan Amount | 8% rate | 12% rate | 18% rate |
|---|---|---|---|
| $10,000 | $244 | $263 | $294 |
| $18,000 | $439 | $474 | $529 |
| $30,000 | $732 | $790 | $881 |
Interest saved by consolidation rate vs existing APR — $18,000, 48 months:
| Existing APR | Consolidation Rate | Interest Saved |
|---|---|---|
| 22% | 12% | approximately $8,000 |
| 22% | 18% | approximately $3,000 |
| 15% | 12% | approximately $1,500 |
| 15% | 15% | $0 (no benefit) |
Consolidation does not reduce debt — it restructures it. The total balance remains identical. The benefit is purely the rate reduction applied to that balance over the repayment period. When a consolidation loan rate is not meaningfully lower than existing rates (less than 3-4% reduction), or when the term is extended so far that total interest paid is similar despite the lower rate, consolidation provides little value and the behavioral risk of adding new credit card charges to cleared cards eliminates any savings.
Frequently Asked Questions
Debt consolidation replaces multiple separate debts with a single new loan, ideally at a lower interest rate. You borrow enough to pay off all existing balances, then make one monthly payment to the new lender. The benefit is twofold: a lower rate reduces total interest, and a single payment simplifies management. Common consolidation vehicles: personal loans (unsecured, 7-25% depending on credit), home equity loans (secured by home, 6-10%), balance transfer credit cards (0% promotional APR for 12-21 months), and debt management plans through credit counseling agencies (negotiated rates with creditors).
Initially, consolidation may cause a small score dip: the hard inquiry for the new loan (small impact, typically 5-10 points) and the average age of accounts decreasing if old accounts are closed. Over time, consolidation typically improves credit: on-time payments build positive history, credit utilization falls as card balances are cleared (a major scoring factor), and the mix of credit types broadens. The key behavior for credit improvement: keep old credit card accounts open after paying them off (preserves credit history length and available credit), and do not add new charges to cleared cards.
These are not mutually exclusive — consolidation combined with avalanche strategy can be optimal. If you can consolidate at a rate significantly below current weighted average rates, do so. Then apply the avalanche to any remaining unconsolidated balances. The consolidation reduces the rate drag while the avalanche maximizes the payoff speed. Consolidation without discipline to stop adding new debt solves the symptom but not the cause. Avalanche without consolidation works but costs more interest than necessary if a lower rate is available. The best outcome uses both: consolidate at a lower rate, then pay aggressively above the minimum.
Credit score requirements for favorable consolidation loan rates: 750+ typically qualifies for the best personal loan rates (6-10% APR). 700-749 typically qualifies for rates of 10-16%. 650-699 may qualify for 15-25%, which may not provide meaningful savings versus existing credit card rates. Below 650, consolidation loan rates may match or exceed credit card rates, eliminating the benefit. For borrowers with good home equity and lower credit scores, a home equity loan or HELOC may offer lower rates despite a lower credit score because the loan is secured by the property.
The primary risk is behavioral: clearing credit card balances through consolidation but continuing to charge on those cards creates both the consolidation loan and new card debt — leaving you worse off than before. The secured risk: using home equity to consolidate unsecured credit card debt converts debt that cannot cost you your home into debt that can. The term extension risk: choosing a long term to minimize monthly payments results in paying more total interest than the original debts, eliminating the financial benefit despite the lower rate. Consolidation solves a math problem — it does not address the spending patterns that created the debt.
Compare total cost (total amount paid including all fees and interest) rather than monthly payment or interest rate alone. Request the full loan disclosure before accepting any offer. Key figures to compare: APR (includes fees), origination fee percentage, prepayment penalty (avoid loans with these), and total interest over the full term. For balance transfer offers, check the promotional APR duration, the rate that applies after the promotional period, and the balance transfer fee. Use the consolidation calculator to model each offer at the same repayment term and compare total interest paid. The lowest monthly payment is not always the lowest total cost.