BNPL Total Cost Calculator
Klarna, Affirm, and Afterpay each show their own numbers in their own app. Add the plans you're considering and line them up side by side: effective APR, total cost, and what you'll actually pay per installment. Nothing uploaded.
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| Provider | Total cost | Per installment | Effective APR |
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Learn more: Buy now pay later economics
How effective APR reveals hidden BNPL costs
Most BNPL plans advertise as "interest-free," but many charge upfront fees that effectively function as interest. A $300 purchase split into 12 weekly payments with a $24 fee yields an effective annual percentage rate (APR) of 39.13% - higher than most credit cards. The calculation annualizes the disclosed fees relative to the purchase price and plan duration. For example, a $100 item with a $5 fee spread over 4 weeks (standard Klarna) implies roughly 65% annualized cost if you bought that way every week. Most consumers never see this number because each BNPL provider shows only its own math, never compared side by side.
Why the cheapest option often isn't the best
Total cost is only one dimension. A plan that costs $1 more total but spreads payments over 12 weeks instead of 4 weeks dramatically changes your cash flow. This calculator shows per-installment amounts so you can decide whether a slightly higher total cost is worth easier payment spacing. Additionally, some BNPL providers report to credit bureaus and some don't - a factor this calculator can't measure. Using multiple BNPL services to juggle payments is a warning sign of financial stress and should prompt a conversation with a financial advisor.
FAQ
Are BNPL plans safe if I miss a payment?
Late payments and missed payments can have serious consequences. Most BNPL providers charge late fees, report delinquency to collection agencies, and impact your credit score if they report to credit bureaus. Some plans allow you to reschedule, but terms vary. If you're unsure you can make all payments on time, BNPL is riskier than a standard payment method you already trust.
Why do fees exist if plans are "interest-free"?
Upfront fees compensate the BNPL provider for the risk of non-payment, fraud prevention, and operational costs. A $24 fee on a $300 plan sounds small until you annualize it: that's 39% APR. Some BNPL providers waive fees for "good" customers, offer fee-free options, or only charge fees for specific products. Always read the fine print before checking out.
Which BNPL plan is actually the cheapest?
This calculator shows that for a given purchase and plan terms, you can directly compare. However, the "cheapest" BNPL plan in general doesn't exist - it depends on which retailers accept which services, whether you have existing loyalty with a provider, and whether the plan duration matches your budget. Use this tool to compare the specific plans you're considering, not to rank providers overall.