To measure the ROI of digital marketing efforts, small businesses should: - Set clear, measurable goals (e.g., website traffic, leads, sales) - Use tools like Google Analytics to track website performance - Monitor social media metrics (engagement, followers, reach) - Track conversion rates from different marketing channels - Measure email marketing metrics (open rates, click-through rates, conversions) - Use UTM parameters to track the source of traffic and conversions - Calculate the cost per lead and cost per acquisition for each channel - Compare the costs of marketing efforts to the revenue generated By consistently tracking these metrics, small businesses can determine which strategies are most effective and adjust their efforts accordingly.