Square Fee Calculator — What to Charge
3.3% + $0.30 (Square Free, online or invoice card)
Rates checked October 2, 2026. Source: Square US pricing. US standard published pricing only.
Are my numbers sent to a server?
No. The math runs in the browser and nothing typed is uploaded or stored.
Worked example
Net you want to keep: $100.00
Formula: Charge = (net + fixed fee) / (1 − percent) → ($100.00 + $0.30) / (1 − 3.3%), rounded up to the cent
Amount to charge: $103.73
Fee on that charge: $3.72
Net after fee: $100.01 (at least $100.00)