💳 BNPL Tool
Affirm Calculator
Estimate Monthly Payments
See your exact Affirm monthly payment, total interest, and full amortization schedule before you buy.
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Affirm Calculator: Estimate BNPL Payments Before You Buy
The Affirm calculator lets you estimate your monthly payment, total interest, and full payment schedule for any Affirm buy now, pay later purchase. Enter your purchase price, optional down payment, APR, and loan term to instantly see what you will owe each month and the total cost of financing.
How Affirm Calculates Payments
Monthly Payment = P × [r(1+r)ⁿ] / [(1+r)ⁿ − 1]
- P = Principal (purchase price minus down payment)
- r = Monthly interest rate (APR ÷ 12)
- n = Number of monthly payments (loan term)
At 0% APR, the payment is simply Principal ÷ Term.
Affirm Payment Examples
$200 @ 0% APR — 3 months
Monthly payment: $66.67/mo
Total interest: $0
$500 @ 15% APR — 6 months
Monthly payment: $87.83/mo
Total interest: $27.00
$1,000 @ 20% APR — 12 months
Monthly payment: $92.63/mo
Total interest: $111.56
$2,000 @ 30% APR — 24 months
Monthly payment: $110.16/mo
Total interest: $643.84
Available Affirm Loan Terms
Affirm typically offers loan terms of 3, 6, 12, 18, 24, or 36 months. Not all terms are available for every purchase — the options shown at checkout depend on the merchant, purchase amount, and your credit profile.
- 3 months — Best for small purchases under $200; lowest total interest
- 6 months — Common for $100–$500 purchases; balanced payment size
- 12 months — Most popular term; works for $200–$2,000
- 18–36 months — For larger purchases; lower monthly payment but more interest
Frequently Asked Questions
How does Affirm calculate payments?▾
Affirm uses standard APR-based amortization to calculate your monthly payments. Your purchase amount (minus any down payment) is divided into equal monthly installments. Each payment covers accrued interest first, then reduces the principal. APR ranges from 0% to 36% depending on your creditworthiness and the merchant offer.
What APR does Affirm charge?▾
Affirm charges between 0% and 36% APR. The exact rate depends on your credit profile, the purchase amount, the selected term, and the merchant. Some merchants offer 0% APR promotional financing, which Affirm subsidizes on the merchant's behalf.
Does Affirm charge interest on 0% APR offers?▾
No. When a merchant offers 0% APR through Affirm, you pay exactly the purchase price split into equal installments — no interest at all. The merchant typically pays a fee to Affirm to subsidize the 0% rate as a promotional incentive for shoppers.
How is Affirm different from a credit card?▾
Unlike a credit card, Affirm charges simple interest — not compound interest. You know your exact monthly payment and payoff date upfront. There are no revolving balances, no late fees, and no hidden charges. Your interest never compounds on unpaid interest, which makes the total cost more predictable.
Can I pay off Affirm early?▾
Yes. Affirm has no prepayment penalty. You can pay off your loan early at any time and you will only owe interest for the days you actually carried the balance. Early payoff reduces the total interest you pay.