Verified Formula, Methodology & Frequently Asked Questions: Square POS & Online Processing Fee Calculator
Calculate Square payment processing fees for online orders (2.9% + $0.30), in-person POS taps, and invoices, plus your exact net profit margin.
Verified Mathematical Equation: Net Profit = (Sale Price + Shipping Charged) − ((Gross × Fee %) + Fixed Fee) − Product COGS − Shipping Cost; Reverse Invoice = (Desired Net + Fixed Fee) / (1 − Fee %)
Frequently Asked Questions (FAQ)
How does the Square POS & Online Processing Fee Calculator work in 2026?
Calculate Square payment processing fees for online orders (2.9% + $0.30), in-person POS taps, and invoices, plus your exact net profit margin. It uses the industry-standard formula (
Net Profit = (Sale Price + Shipping Charged) − ((Gross × Fee %) + Fixed Fee) − Product COGS − Shipping Cost; Reverse Invoice = (Desired Net + Fixed Fee) / (1 − Fee %)) and updates your KPIs, visual breakdown bar, and comparison table at 60fps as you type or drag the sliders.How can I share my exact scenario with a client, partner, or spouse?
Click the 🔗 Share Scenario Link button at the top of the page. It encodes every input you entered directly into a custom URL so anyone who clicks your link sees your exact numbers immediately.
Is my financial data private and does this work offline?
Yes—100% of calculations happen locally inside your browser using JavaScript. No personal or financial inputs are ever transmitted to an external database.
Can I embed the Square POS & Online Processing Fee Calculator on my own website or client portal?
Yes! Click </> Embed on Your Site (Free) above to copy a clean, responsive
<iframe> widget that automatically adapts to any screen size.