About the Credit Card Processing Fee Calculator
This credit card processing fee calculator compares the three pricing models merchant processors use — flat-rate, interchange-plus and tiered — on your own monthly card volume and transaction count. It returns the monthly cost of each, the effective rate (total fees ÷ card sales) and how much the cheapest option saves per year.
It is built for small business owners, restaurant and retail operators, and e-commerce sellers reviewing a processor quote or a monthly statement. The effective rate is the single number that makes quotes comparable: a low headline percentage can still be expensive once per-transaction fees, monthly fees and non-qualified surcharges are added.
The default rates are illustrative, not quotes from any provider. Real interchange depends on card type (debit, rewards, business), how the card is accepted (in person or keyed/online), your industry and the card network’s current schedule, so replace the defaults with the numbers on your statement or proposal. Hardware, PCI, chargeback and early-termination fees are not included unless you add them to the monthly fee.
With the default inputs, the lowest monthly processing cost is $1,260.00. Change any value above to recalculate instantly.
How to use the credit card processing fee calculator
- 1Enter your monthly card volume and number of transactions from a recent statement.
- 2Enter the flat-rate percentage and per-transaction fee you are quoted (or currently pay).
- 3Enter average interchange plus the processor’s markup for interchange-plus pricing.
- 4Enter tiered rates and your estimated mix of qualified, mid and non-qualified volume.
- 5Compare the monthly costs and effective rates, and check the yearly savings.
Formula and method
Every model reduces to a percentage of volume (r × V), a fixed fee per transaction (f × T) and a fixed monthly fee (M). Flat-rate pricing uses one percentage and one per-transaction fee for every card. Interchange-plus passes through the card networks’ interchange and assessment costs and adds the processor’s markup, so r = average interchange + markup % and f = average interchange per item + markup per item.
Tiered pricing buckets each sale as qualified, mid-qualified or non-qualified; the calculator blends the three rates by your volume mix. The effective rate — total fees divided by card volume — is the fairest way to compare providers because it includes every fixed and per-item charge.
- V
- Monthly card sales volume
- T
- Number of card transactions per month
- r
- Percentage rate (blended for tiered)
- f
- Fee per transaction
- M
- Fixed monthly fees
Worked examples
$50,000 a month, 1,000 transactions
Flat-rate costs 2.9% × $50,000 + $0.30 × 1,000 = $1,750 (3.5% effective). Interchange-plus is 2.1% × $50,000 + $0.20 × 1,000 + $10 = $1,260. Tiered blends to 2.12% plus $0.25 per sale and $10, or $1,320. Interchange-plus saves $490 a month — $5,880 a year — versus flat-rate.
Small shop: $5,000 a month, 200 sales
At low volume the gap narrows: flat-rate costs $145 + $60 = $205, interchange-plus $105 + $40 + $10 = $155, and tiered $106 + $50 + $10 = $166. The $10 monthly fees matter more at small volumes, but interchange-plus still saves $600 a year here.
Coffee shop with tiny tickets
With a $5 average ticket, per-transaction fees dominate: flat-rate charges $232 in percentage fees but $480 in $0.30 fees, an 8.9% effective rate. Interchange-plus at $0.20 per item totals $513 even with a $25 monthly fee, and tiered comes to $594.60.
Frequently asked questions
What is a good effective rate for credit card processing?+
There is no universal benchmark: it depends on your card mix (debit vs rewards vs business cards), whether cards are present or keyed/online, your average ticket and your industry. Small tickets and card-not-present sales push the effective rate up. Compare your own effective rate across quotes rather than headline rates.
What is interchange-plus pricing?+
Interchange-plus passes the card networks’ actual interchange and assessment fees straight through and adds a fixed processor markup (for example 0.3% + $0.10). It is the most transparent model and usually cheapest for established businesses with steady volume.
Why is tiered pricing often more expensive?+
The processor decides which transactions are “qualified”. Rewards cards, business cards and keyed-in sales are often downgraded to the mid or non-qualified tier at a higher rate, so your real cost can be well above the advertised qualified rate.
When is flat-rate pricing the best choice?+
Flat-rate (as used by many payment apps) is simple and has no monthly fee, which suits new or low-volume businesses and those with larger tickets. As volume grows, interchange-plus usually becomes cheaper.
How do I calculate my effective rate from a statement?+
Add up every fee on the monthly statement — percentage fees, per-item fees, monthly, PCI and other charges — and divide by your total card sales for the month. Multiply by 100 to express it as a percentage.
Results are estimates for educational purposes and are not financial advice. Rates, fees and terms vary — confirm with your lender or a licensed advisor before making decisions.