Return on Investment Definition A measure of campaign performance, calculated by comparing what you’ve put in versus what you’re getting back. Keeping tabs on the ROI of your campaigns helps you make smarter decisions about how you should be allocating resources. “Marketers that measure return on investment are 12x more likely to generate greater ROI year-over-year.” — @HubSpot Tweet This Resources How To Calculate ROI (Return On Investment) How to Measure the ROI of Your Marketing Programs