Funnel Drop-off Calculator
180 of 20,000 made it all the way through, a 0.9% end-to-end conversion.
What is Funnel drop-off?
Funnel drop-off shows where you lose people stage by stage. Each step conversion is that stage divided by the previous one, and the drop-off is the rest: 20,000 visitors down to 4,000 leads is a 20.0% step conversion and an 80.0% drop-off.
The overall figure is the last stage divided by the first. From 20,000 visitors to 180 customers, end-to-end conversion is 0.9%, the share that made it all the way through.
Step rates compound rather than add, so the headline overall number is always lower than any single step. That is why the per-step view matters: it pinpoints the leak the overall rate only hints at.
How to calculate Funnel drop-off
Step conversion = Stage ÷ Previous stage
- List the stages in order. Enter the count at each stage from top to bottom, for example visitors, leads, opportunities, customers.
- Get each step conversion. Divide each stage by the one before it. 4,000 leads from 20,000 visitors is 20.0%, so the drop-off is 80.0%.
- Read the per-step rows. Each row shows the step conversion and the drop, so you can see which transition leaks worst relative to the others.
- Check the end-to-end number. The first stage into the last is the overall rate. 180 of 20,000 is 0.9% all the way through.
Worked example
A funnel runs 20,000 visitors to 4,000 leads to 900 opportunities to 180 customers.
| Visitors | 20,000 |
|---|---|
| Leads | 4,000 |
| Opportunities | 900 |
| Customers | 180 |
| Result | 0.9% end-to-end conversion |
Of 20,000 visitors, 180 became customers. The step rates are 20.0% (visitors to leads), 22.5% (leads to opportunities) and 20.0% (opportunities to customers): all in the same range, so no single step is the obvious villain here.
How to improve Funnel drop-off
- Target the step with the lowest conversion relative to its neighbours first, not the one losing the most raw people.
- Remember the compounding: a few points gained at a late, qualified step can outweigh a bigger gain up top.
- Match each stage to the right asset, since the friction that stalls a visitor differs from what stalls an opportunity.
- Watch the step rates over time, because a step that is sliding flags a problem before the overall number moves.
Frequently asked questions
- What is funnel drop-off and how do you calculate it?
- Funnel drop-off is the share of people lost between two stages of a funnel, and its mirror, step conversion, is the share that move forward: stage divided by previous stage. From 20,000 visitors to 4,000 leads is a 20.0% step conversion, an 80.0% drop-off. End to end, 180 customers from 20,000 visitors is a 0.9% overall conversion.
- How do I find the weakest step in my funnel?
- Compare the step conversion rates, not the raw counts. The biggest drop-off in absolute people is usually early, where volume is high, but the worst-performing step is the one with the lowest conversion rate relative to what is normal for that stage. Fixing a low-rate step late in the funnel often returns more revenue per point gained, because the traffic there is already qualified.
- What is a good funnel conversion rate?
- There is no single benchmark, because it depends on how many stages you have and how qualified each one is. A four-stage funnel will show a much lower end-to-end rate than a two-stage one, simply because the losses compound. Judge each step against its own past performance and against the stages around it, rather than chasing an industry overall number.
- Why is the overall conversion rate so much lower than each step?
- Because step rates multiply, they do not add. A funnel that converts 20%, then 22.5%, then 20% at each step does not lose 60% overall; it ends at 0.9% (0.20 times 0.225 times 0.20). That compounding is why a modest gain at one healthy-looking step can move the end-to-end number more than it appears.
- How many funnel stages should I track?
- Track the stages where a real decision happens and a measurable drop occurs, typically three to five. Too few hides where you lose people; too many splits the funnel into steps so small the rates get noisy. The calculator handles two to four stages, which covers most marketing and sales funnels from visitor through to customer.