ROMI (Return on Marketing Investment) is the return on marketing spend. It answers one question: how much revenue did the money put into marketing bring? Formula: ROMI = (revenue from marketing − marketing cost) ÷ marketing cost × 100%.
ROMI shifts marketing from a "cost" view to an "investment" view. For example, if a $1,124 budget produced $200,000+ in revenue — that's a very high return. If ROMI is positive, marketing pays for itself and is worth scaling.
