Both personal loans and credit cards let you borrow money you don't have yet, but they're structured very differently, and that structure — not just the headline interest rate — often decides which one actually costs less for a given need.
Structure matters as much as rate
A personal loan is a fixed amount, fixed rate, fixed term — you know the exact payoff date and total cost from day one, calculated by amortization just like a mortgage or car loan. A credit card is revolving: there's no fixed payoff date unless you set one yourself, and minimum payments are deliberately structured to be low, which — as our credit card payoff calculator shows — can stretch repayment out for many years even on a moderate balance.
When a personal loan usually wins
For a known, one-time expense — consolidating existing card debt, funding a specific project — a personal loan's fixed rate and term are usually cheaper than letting the same amount sit on a card, because card APRs tend to run higher than personal loan rates for borrowers with similar credit, and the fixed schedule guarantees the debt actually gets paid off on a set date.
When a credit card can make sense
A 0% introductory-rate credit card, if you can pay off the balance before the promotional period ends, can beat any personal loan's rate outright. Cards also offer more flexibility for smaller or uncertain amounts. The risk is what happens if the balance isn't cleared in time — the rate typically jumps to a much higher standard APR, often erasing the advantage entirely.
Running the actual comparison
Take the amount you need, then compare a personal loan's total interest (via our loan calculator) against the credit card's total interest if paid off over the same timeframe (via our credit card payoff calculator). The one with lower total interest for your realistic repayment timeline is the cheaper option — don't compare interest rates alone without factoring in how each debt is actually structured to be repaid.