ACV (annual contract value) measures the value of the contract over a 12-month period.
Questions to ask about ACV:
What is the size? Are you getting a few hundred dollars per month from your customers, or are you able to close large deals? Of course, this depends on the market you are targeting (SMB vs. mid-market vs. enterprise).
Is it growing (and especially not shrinking)? If it’s growing, it means customers are paying you more on average for your product over time. That implies either your product is fundamentally doing more (adding features and capabilities) to warrant that increase, or is delivering so much value customers (improved functionality over alternatives) that they are willing to pay more for it.