Buy Now Pay Later Calculator

About this calculator

Buy Now, Pay Later (BNPL) plans — offered by services like Klarna, Afterpay, Affirm, and PayPal Pay in 4 — let shoppers split a purchase into a series of installments, often four biweekly payments with 0% interest, or longer monthly plans that may charge interest depending on the provider and purchase amount. Retailers pay a merchant fee to offer BNPL at checkout because it tends to increase average order value and conversion rates, while consumers get short-term financing without a traditional credit card application.

Shoppers and personal-finance-conscious buyers use a BNPL calculator to see exactly what each installment will cost and what the total repayment adds up to before committing, since some plans charge interest or late fees that can make the effective cost higher than the sticker price — a distinction that matters because BNPL debt doesn't always appear on a traditional credit report the way a credit card balance does, making it easy to lose track of multiple concurrent plans.

This calculator takes your purchase price, any down payment, the number of installments, and the interest rate (if any), and returns your per-period payment amount, total cost, and total interest so you can compare a BNPL plan against paying in full or using a credit card.