Provide your monthly ARPU, number of paid users, and churn rate. The calculator will use these to project your ROI. Choose a preset in the "Projection Scenario" field: Best-case, Conservative (high-end), or Conservative (low-end). If you select "Custom," you can enter your own percentage increases for ARPU, paid users, and decreases in churn rate. The calculator will then project your ROI based on these custom inputs.