Debt Consolidation Calculator: One Payment, Total Interest
See the single monthly payment that would replace several debts if you consolidated them into one loan, and what the switch costs or saves in interest.
Adjust the inputs and select Calculate for a full breakdown.
Year-by-year amortization schedule
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Monthly payment | Total interest | Total of payments |
|---|---|---|---|
| $25k · 9.5% · 5-year | $525.05 | $6,502.79 | $31,502.79 |
| $25k · 12.3% · 3-year | $833.94 | $5,022.00 | $30,022.00 |
| $40k · 10.0% · 7-year | $664.05 | $15,779.98 | $55,779.98 |
| $15k · 8.0% · 4-year | $366.19 | $2,577.30 | $17,577.30 |
How This Calculator Works
Enter the combined balance of the debts you want to merge, the rate on the new consolidation loan, and the term you would take it over. The calculator applies the fixed-rate amortization formula to produce one level monthly payment in place of your current mix of bills, then rebuilds the schedule so you can see the interest cost of the consolidated loan across its life.
The Formula
Fixed-Rate Amortization
P = loan amount, r = monthly rate (APR ÷ 12), n = number of monthly payments
Worked Example
Suppose you owe $25,000 spread across credit cards averaging around 21% and you consolidate it into a 5-year loan at 9.5%. The new payment is about $525 a month and total interest is roughly $6,500 — far less than the cards would charge, provided you do not let the card balances build back up.
Key Insight
Consolidation only saves money if the new loan's rate is genuinely lower and you stop adding new debt. The trap is treating freed-up credit cards as room to spend, which leaves you with both the loan and fresh balances.
Three consolidation vehicles: personal loan, 0% balance transfer, HELOC
PERSONAL CONSOLIDATION LOAN (8-25% APR): unsecured, fixed rate, fixed 3-7 year term. Predictable monthly payment, rate locked. Best for $5k-$50k of consumer debt at higher rates. Top lenders 2026: SoFi, LightStream, Discover, Marcus by Goldman Sachs. Requires credit score 650+ for reasonable rates.
0% BALANCE TRANSFER CARD (12-21 month promo + 3-5% transfer fee): essentially free money for the promotional period IF you can pay off before the promo ends. After promo, rate jumps to 18-26%. Best for $3k-$15k that you'll aggressively pay down. Top offers 2026: Chase Slate Edge, Citi Diamond Preferred, Wells Fargo Reflect.
HELOC OR HEL (7-10% APR): secured by home, lowest rate option, deductible only for home improvement (not consolidation). Best for $20k+ at high rates IF you have significant home equity AND won't run up the original cards again. Major risk: converts unsecured debt to secured by home — defaulting now means foreclosure.
The behavioral trap: re-spending the freed-up credit
Consolidation's mathematical benefit assumes you DON'T continue running up balances on the cards you consolidated. Study after study (Federal Reserve, CFPB) shows ~70% of consolidators have HIGHER total debt 2 years later than before consolidation. Why: consolidation paid off the cards (showing $0 balance), then the cardholder kept using them.
The consolidation worked exactly as designed — but the underlying behavior didn't change. Now there's the new consolidation loan + new card balances. The household is worse off than before.
Behavioral fix BEFORE consolidating: (1) Close the cards once paid off, OR (2) Cut up the physical cards but keep accounts open for credit score health, OR (3) Move to debit-only spending for 2 years to break the credit card habit. Without addressing the spending pattern, consolidation just clears the runway for the next round of credit card debt. Consolidation is a tool, not a cure — the cure is the spending change.
Math: when consolidation truly saves money
True savings requires the consolidation loan rate × term to be LESS than current debt rates × current payoff time. Many 'consolidations' lower monthly payment by extending the term, increasing total interest paid even at lower rate.
Worked example: $30,000 credit card debt at 22% APR, currently paying $750/month. Without consolidation: pays off in ~5 years, total interest $14,500. Consolidation to 12% APR personal loan over 5 years: payment $668/month, total interest $10,070. Saves $4,400 in interest AND $82/month cash flow. Pure win.
Counter-example: same $30,000 at 22% consolidated to 8% HELOC over 15 years (extending term to lower payment): payment $287/month — sounds much better! But total interest $21,600 — WORSE than the original 22% by $7k. The longer term killed the rate advantage. Always compare TOTAL INTEREST PAID, not just monthly payment. Lower payment with longer term is usually a wealth-destroying trade.
Consolidation outcomes for $30,000 credit card debt at 22% APR
Various consolidation paths. The baseline is paying current cards at $750/month minimum. The right consolidation lowers BOTH monthly payment AND total interest.
| Strategy | Monthly payment | Payoff time | Total interest | Better/Worse vs baseline |
|---|---|---|---|---|
| No consolidation (status quo) | $750 | 5 yr | $14,500 | Baseline |
| Personal loan, 12% APR, 5-yr | $668 | 5 yr | $10,070 | −$4,400 better |
| 0% Balance transfer, 18-mo, paid off | $1,725 | 18 mo | $900 (transfer fee) | −$13,600 better |
| HELOC, 9% APR, 7-yr term | $483 | 7 yr | $10,567 | −$3,900 better |
| HELOC, 9% APR, 15-yr term (extending) | $304 | 15 yr | $24,725 | +$10,225 WORSE |
The longest-term option has the lowest monthly payment but ends up costing the most. Aim for consolidation that keeps the payoff timeline similar to current AND lowers the rate. Never extend the term to feel better — extension is wealth destruction.
Frequently Asked Questions
When does debt consolidation actually save money?
It saves money when the consolidation loan's APR is lower than the weighted average rate of the debts you are merging, and when you avoid taking on new debt. If the new rate is similar or higher, consolidation mainly simplifies payments rather than cutting cost.
Which debts can be consolidated?
Most unsecured debts can be combined — credit cards, store cards, medical bills, and other personal loans. Secured debts such as a mortgage or auto loan are usually left out because they are tied to specific collateral.
Will consolidating my debt hurt my credit score?
The application creates a short-term dip from the hard inquiry, and opening a new account lowers the average age of your credit. Over time, paying the consolidation loan reliably and lowering card utilization usually improves the score.
Does a longer term make consolidation a bad idea?
Not necessarily, but stretching the term lowers the monthly payment while raising total interest. Always compare the total interest of the consolidation loan against what you would otherwise have paid on the original debts.
Is a balance transfer card an alternative?
For smaller balances that can be cleared within a card's promotional window, a 0% balance transfer can beat a loan. For larger balances needing several years, a fixed consolidation loan gives a predictable payoff date.
What is the difference between consolidation and debt settlement?
Consolidation repays your debts in full through one new loan. Debt settlement negotiates to pay less than you owe and seriously damages credit. They are very different paths, and this calculator covers consolidation only.
References & Authoritative Sources
- CFPB — Consumer Financial Protection Bureau — Debt consolidation pros and cons · consulted May 31, 2026 · Federal consumer protection — consolidation comparison, behavioral risks, recommended steps
- Federal Reserve — Household Debt and Credit Report — Consumer debt trends and consolidation outcomes · consulted May 31, 2026 · Quarterly data — consumer debt by type, default trends
- FINRA — Financial Industry Regulatory Authority — Debt consolidation warnings and complaints · consulted May 31, 2026 · Self-regulatory organization — warnings about debt settlement vs consolidation, scam patterns
Related Calculators
Data Sources & Benchmarks
This calculator draws on 3 independent, dated sources. The starting values for consolidation loan rate are taken from the benchmarks below and refresh whenever the snapshots are updated.
Methodology & Review
The consolidated payment uses the standard fixed-rate amortization formula applied to the combined balance entered. It does not model the original debts individually or any balance-transfer fee. Results are reviewed against published lender amortization tables.
Updated