Event ROI calculator

Event ROI is the revenue an event produced minus what it cost, divided by that cost. This calculator applies the formula to three event types that fund themselves differently: a trade show, a webinar, and a sponsorship. No email required, and every assumption behind the arithmetic is written out below.

The formula

ROI (%) = (Attributed revenue − Total cost) ÷ Total cost × 100

Attributed revenue is derived, not entered directly. It comes from the number of qualified leads an event produced, how many of those closed, and what a closed deal is worth:

Attributed revenue = Qualified leads × Close rate × Average contract value

Where qualified leads come from depends on the event type, which is why the three tabs ask for different inputs rather than dressing one formula in three costumes.

Event type Qualified leads
Trade show Badge scans × qualification rate
Webinar Registrations × attendance rate × qualification rate
Sponsorship Leads passed by the organiser × qualification rate

What goes into total cost

Every tab adds up its direct costs and then adds the cost of your team's time, because time is the line most often left out, and leaving it out is what turns a modest return into a spectacular one on paper.

Total cost = Direct costs + (Team days × Loaded cost of a team day)
Event type Direct cost lines
Trade show Booth space, booth build and logistics, travel and accommodation
Webinar Platform and hosting, promotion budget, content production
Sponsorship Sponsorship package, activation and collateral

A loaded day rate is not a salary divided by working days. It includes employment costs and overhead, and your finance team almost certainly has a figure for it already. Ask them for that number rather than inventing one.

Every assumption, written down

The calculator ships with starting values so the page is useful before you touch anything. They are illustrative defaults, not benchmarks, and nothing here is a claim about what your events will return:

Input Default Why this default
Average contract value $16,000 Placeholder for mid-market B2B. Replace it with yours
Close rate on qualified leads 12% Deliberately conservative
Loaded cost of a team day $600 Salary plus overhead, ask your finance team
Webinar attendance rate 42% Registration-to-attendance commonly lands between 35% and 50%. Use your own history

Change any of them and the result changes with it. That is the point: a calculator that hides its coefficients produces a number nobody can defend in a budget meeting.

Two numbers worth more than the ROI line

Cost per qualified lead tells you whether an event competes with your other channels. A trade show returning 180% may still be your most expensive source of pipeline, and that is worth knowing before you book next year's booth.

Close rate on event-sourced leads tells you whether the pipeline an event produces is better or worse than your average. Events often produce fewer leads that close at a higher rate, and a headline ROI figure hides that entirely.

What this calculator cannot know

It assumes every qualified lead can be traced back to the event. In practice, attribution breaks between the event platform and the CRM, and the last touch before a deal closes is rarely the event itself. If you attribute on last touch, events will look worse than they are, the ad clicked a week before signature takes the credit.

Multi-touch attribution shares credit across every touchpoint that influenced the deal. It does not inflate the number; it stops the number from being assigned to the wrong channel.

The result here is also a snapshot, not a forecast. Event costs land immediately and event revenue lands whenever the sales cycle ends, often one to three quarters later. Compare like with like: measure a cohort of events once their pipeline has had time to close.

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