I built the debt consolidation calculator because I kept hearing the same pitch: “Roll everything into one loan at a lower rate and save a fortune.” Sometimes that’s true. Sometimes it’s the same debt with a longer fuse. The difference between those two outcomes is a single calculation most people never run.
Here’s how to do it.
→ Run your debt consolidation numbers first
What debt consolidation actually is
Debt consolidation means taking multiple debts, usually credit cards, medical bills, or personal loans, and combining them into one new loan with a single monthly payment. The appeal is a lower interest rate, one payment instead of several, and a clear payoff date.
The catch is that a lower rate isn’t always available, and even when it is, origination fees and a longer repayment term can quietly erase the savings.
The math that determines if it’s worth it
There are four numbers that actually matter:
1. Your current weighted average interest rate. If you have a $5,000 card at 24% and a $3,000 card at 18%, your weighted average isn’t 21%. It’s closer to 21.75%, weighted by balance. That’s the rate you need to beat.
2. The new loan rate and origination fee. A consolidation loan at 12% sounds great against a 24% card, but if the origination fee is 5% of the loan amount, you just paid $400 upfront on an $8,000 loan before the math even starts working in your favor.
3. Total interest paid, not just the monthly payment. A lower monthly payment usually means a longer term, which means more total interest. A $10,000 loan at 12% over 5 years costs $3,346 in interest. The same amount at 18% over 3 years costs $2,948. The “lower rate” loan with a longer term costs more.
4. The break-even point. How many months until your total savings (from the lower rate) exceed the origination fee? If that’s 24 months and you’re not certain you’ll stick with the plan that long, the consolidation may not pay off.
I built the calculator to show all four numbers at once, not just the monthly payment reduction, which is the only thing most lenders advertise.
When consolidation clearly makes sense
The math works cleanly when:
You’re carrying high-rate credit card debt (20%+) and can qualify for a personal loan at 10-14%. The rate gap alone generates meaningful savings even after fees. On a $15,000 balance at 24% APR, a 12% consolidation loan saves roughly $4,200 in interest over 3 years, well above a typical $150-300 origination fee.
You have three or more cards and the payment management overhead is genuinely causing problems. Even if the rate savings are modest, streamlining to one payment reduces the chance of a missed payment that triggers a penalty rate.
You have a defined payoff date in mind. If you know you want to be debt-free in 36 months, a fixed-rate personal loan forces that discipline. A minimum payment on a revolving card lets you drift indefinitely.
When it doesn’t
The math breaks down when:
The rate reduction is small. If you’re moving from 22% to 18%, the savings are real but modest. On $8,000 over 3 years, that’s about $650 in interest savings. A 3% origination fee ($240) leaves $410 in net benefit, not nothing, but probably not worth the credit inquiry, paperwork, and risk of reverting to card spending.
The loan term is much longer than your current payoff trajectory. If you’re aggressively paying down cards and could be done in 18 months, a 5-year consolidation loan might actually cost you more total interest even at a lower rate, because you’re now paying interest for 60 months instead of 18.
You plan to keep using the credit cards. This is the most common failure mode. Consolidation clears the balances, the cards feel available again, and six months later you’ve added $4,000 in new card debt on top of the consolidation loan. The math only works if the original accounts stay at zero.
What to look for in a consolidation loan
A few things worth checking before you apply:
Origination fees. Anything under 1% is competitive. Fees above 3% start eating into the interest savings meaningfully. Some lenders charge 0%, and those are worth prioritizing if you qualify.
Prepayment penalties. Make sure you can pay the loan off early without a fee. If rates drop or you get a windfall, you want the option.
Fixed vs. variable rate. Variable-rate loans look attractive at first but can reset upward. For debt consolidation, fixed is almost always the right choice. You’re buying certainty.
Minimum debt thresholds. Many lenders want at least $5,000-$7,500 in eligible debt before approving a consolidation loan. Below that, a 0% balance transfer card is usually the better tool. (See: Is a balance transfer worth it?)
The alternative: balance transfer
If your primary debt is credit card balances under $10,000 and you can realistically pay it off within 15-21 months, a 0% balance transfer card is often more effective than a personal loan consolidation. No interest for the promo period beats a 12% loan every time, assuming you hit the payoff window.
The downside is the transfer fee (usually 3-5%) and what happens at the end of the promo period if there’s still a balance. The balance transfer calculator shows whether the fee math works for your specific balance.
A realistic example
Sarah has $14,500 in credit card debt spread across three cards: $6,000 at 26%, $5,000 at 22%, and $3,500 at 19%. Her weighted average rate is about 23%. She’s making $450/month in minimum payments and barely touching the principal.
She qualifies for a $14,500 personal loan at 13.5% APR, 36-month term, with a 1.5% origination fee ($218). New payment: $488/month, slightly higher than minimums, but with a hard end date.
Total interest on the consolidation loan: $3,126. Plus the origination fee: $3,344 total cost.
Total interest if she keeps the cards and only pays minimums: the calculation gets ugly. At 23% average APR with $450/month minimum payments, she’s looking at 6+ years to payoff and $10,000+ in total interest.
The consolidation saves roughly $6,700 and five years of payments. That’s worth it. Run your own numbers here.
The bottom line
Debt consolidation is worth it when your rate savings are real, the origination fee is low, and you’re not going to reload the cards afterward. It isn’t worth it when the rate drop is small, the term is long, or you’re consolidating to buy breathing room rather than to actually get out.
The one-number test: does the total interest paid on the new loan, including origination fee, come out less than what you’d pay staying on the current path? If yes, run it. If no, or if it’s close, keep paying aggressively on the highest-rate card first.
→ Debt Consolidation Calculator: get your Worth It Score
Frequently Asked Questions
Does debt consolidation hurt your credit score?
Short-term, yes, a hard inquiry when you apply typically drops your score 5-10 points. Medium-term, consolidation usually helps: your credit utilization ratio drops (because card balances go to zero), and consistent on-time payments on the new loan build your score back up within 6-12 months.
Is it better to consolidate debt or pay it off individually?
It depends on the math. If the consolidation rate is meaningfully lower (5+ points) and origination fees are modest (under 2%), consolidation usually wins on total interest paid. If the rate difference is small, paying off the highest-rate card first (avalanche method) avoids fees and terms and often produces comparable results. See the Debt Avalanche vs. Snowball breakdown for the comparison.
What credit score do you need for a debt consolidation loan?
Most lenders offering competitive rates (under 14%) want a 660+ credit score. Under 620, the rates on consolidation loans often exceed credit card rates, which makes consolidation counterproductive. If your score is below 640, focus on reducing card utilization first. That’s often the fastest path to a score that qualifies you for a rate worth having.
Worth It Calculators provides educational tools and general information. I’m not a licensed financial advisor. Always review loan terms carefully before signing. Some links may earn a commission at no extra cost to you.