• 0–5 square inches: $12 per square inch (minimum charge ~$40–$60, aligning with matchbox/hand).

• 6–15 square inches: $6 per square inch (e.g., 12 sq in = $72, close to $60+ for hand size).

• 16–30 square inches: $4 per square inch (e.g., 24 sq in = $96, near $80+ for both hands).

• 31+ square inches: $2 per square inch (e.g., 100 sq in = $200, above $100+ but fair for XL work).

Add a minimum fee: Since the clinic starts at $40+, set a minimum charge (e.g., $50) to cover small tattoos under 4–5 square inches, ensuring profitability.