Enter your purchase and BNPL plan. See the true cost including interest and foregone investment growth.
This calculator exposes the real cost of Buy Now Pay Later (BNPL) financing — including interest charges, late fees, and the opportunity cost of the money tied up in installments. It's for anyone using services like Klarna, Afterpay, Affirm, or Zip who wants to know whether "splitting into 4 payments" is actually costing them more than paying upfront.
For "pay in 4" plans (Afterpay, Klarna's interest-free option): the true cost is zero interest but potentially significant late fees — typically $7–$10 per missed payment, which on a $100 purchase represents a 7–10% penalty. For longer-term BNPL loans (Affirm, Klarna Financing): APRs range 0–36%, making the effective interest calculation identical to a standard loan amortization. The calculator applies the APR to the outstanding balance each pay period.
BNPL usage has exploded — nearly 40% of US adults used a BNPL service in 2023, and the average BNPL user carries 3+ active installment plans simultaneously. Research from the Consumer Financial Protection Bureau found that BNPL users are more likely to carry revolving credit card debt and have lower credit scores, suggesting these products often extend financial stress rather than relieve it. The psychological appeal of "small payments" masks the cumulative total.