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Free Payment-Processing Fee Calculator

See exactly what a payment processor takes from a transaction: percentage fee, fixed fee, and what you actually receive.

The payment-processing fee calculator shows the true cost of accepting a card payment. Enter the transaction amount, the processor’s percentage fee, and any fixed fee per transaction, and the calculator returns the exact fee, the amount you actually receive, and the effective rate — the fee as a percentage of the transaction. The effective rate matters because fixed fees dominate small transactions: a 2.9% + $0.30 structure on a $1 payment takes 32.9% of the sale, while on $100 it takes 3.2%. The calculator also includes a reverse mode that derives the sale amount needed to net a target after fees — essential when a price must land on a specific net figure. Structures with no percentage (flat $0.30 per transaction) are supported by entering 0%. Decimal arithmetic keeps every fee exact; rounding applies only to display. Everything runs locally in your browser — amounts never leave your device and are never logged. Use this calculator when comparing processors, setting prices that absorb fees, or quoting net amounts.

Processed locally in your browser

Amount charged to the customer.

Percentage component of the fee structure.

Flat per-transaction component.

How is the result calculated?

Comparing structures: 2.9% + $0.30 on a $10 sale

A $10 sale under a 2.9% + $0.30 structure costs 0.29 + 0.30 = $0.59, so you receive $9.41 and the effective rate is 5.9%. A flat $0.30 structure on the same sale costs just $0.30 (3% effective). On a $500 sale the percentage structure costs 14.50 + 0.30 = $14.80 (2.96% effective) while the flat structure still costs $0.30 — which structure wins depends entirely on your average transaction size.

Input Value
amount 10.00
percentFee 2.9
fixedFee 0.30
Result Fee $0.59 · you receive $9.41 · effective rate 5.9%

What is the formula and its assumptions?

Processing fee

fee = amount × percent% / 100 + fixed fee

Symbol Meaning
amount transaction amount
percent% percentage component of the fee structure
fixed fee per-transaction fixed component

Amount you receive

net = amount − fee

Symbol Meaning
fee total processing fee

Effective rate

effective % = fee / amount × 100

Symbol Meaning
fee total processing fee

The effective rate is what a fixed fee plus percentage really costs as a share of the transaction — the number to use when comparing processors.

What are the most common mistakes?

  • Comparing headline percentages instead of effective rates, which hides the impact of fixed fees on small sales.
  • Forgetting that payment fees are a variable cost that must be included in break-even and margin calculations.
  • Using the fee structure that suits large transactions for small ones (or vice versa) without checking the crossover point.

What are the assumptions and limitations?

  • Models the standard percent + fixed structure; statement fees, chargebacks, and international surcharges are not included.
  • Processor terms change — verify current rates with the processor before deciding.
  • Results are for pricing decisions, not professional financial or legal advice.

Where do the numbers come from?

Last reviewed August 4, 2026 · Version 1.0.0 · Toolivaro does not guarantee external content.

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Frequently asked questions

Why does the effective rate rise on small transactions?

Because the fixed per-transaction fee is spread over a smaller amount. On a $1 payment, $0.30 is 30% of the sale before the percentage even applies. Effective rate — not the headline percentage — is the honest comparison metric.

Are there other card-processing costs?

Yes: statement fees, chargebacks, and cross-border or currency-conversion surcharges exist on many plans. This calculator models the standard percent + fixed structure; other costs should be added to your own comparison.

Should I add processing fees to my prices?

Many businesses either absorb fees or add a surcharge where local rules allow it (surcharging is regulated in several regions). Use the reverse mode to find the price that nets your target after fees, and check local card-network rules before surcharging.

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