BNPL Is Convenient — But What's the Real Cost of Deferring?
Buy Now Pay Later apps like Klarna, Afterpay, and Affirm make it easy to split a purchase into payments, but interest-bearing or late-fee-triggering plans quietly add real cost the longer you carry a balance. Multiply your monthly fee rate by the number of months, and you get the total fee — which functions just like interest even if the app doesn't call it that. This calculator takes your purchase amount, monthly fee rate, and number of installments to show total fees, total repayment, and the effective annualized rate. A 3% monthly fee works out to about 36% a year — far higher than most credit cards.
Enter your BNPL spending limit to check whether your purchase fits within it. Limits vary by provider and your history with the app, typically ranging from a few hundred to a couple thousand dollars, with new users usually starting lower. Exceeding your limit means the purchase may be declined or reduced. BNPL is convenient for spreading out a cost, but since the real expense adds up quickly, it's best used sparingly and paid off as fast as possible.
Frequently Asked Questions
Pay-in-4 plans are interest-free if paid on time but charge late fees. Longer BNPL loans often carry a real APR, sometimes up to 30%+.
Usually a few hundred to a couple thousand dollars, with new users starting lower. Over-limit purchases may be declined or reduced.
Multiply the monthly fee rate by 12. A 3% monthly fee is about 36% a year — much higher than most credit cards or loans.
※ Fee rates and limits vary by provider and plan. This is a reference estimate only.