Two Stage Funnel Calculator
How many final outcomes are expected from two sequential funnel rates? Check the formula, a worked example and the stated measurement limits.
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Starting entrants (entrants) | Enter a whole count in entrants; keep the reporting population consistent. |
| First-stage rate (%) | Enter percentage units: 80 means 80%, not 0.8. |
| Second-stage conditional rate (%) | Enter percentage units: 80 means 80%, not 0.8. |
Understanding your result
Use the model to locate sensitivity: improving either stage changes the final expected yield, but implementation cost and lead quality remain separate questions.
Common mistakes
- Adding stage percentages is incorrect.
- A second-stage rate over all entrants is not a conditional stage rate.
Check your calculation
- Use the worked example as a known reference case, then change one input at a time and check the direction and units of the response.
Choose a consistent measurement basis
Use sequential stages with nested populations and consistent eligibility windows. The second percentage must use first-stage completers as its denominator.
A second independently worked case
A zero first-stage rate leaves no modeled entrants to the second stage. Inputs: Starting entrants: 1000 entrants; First-stage rate: 0 %; Second-stage conditional rate: 25 %. Results: Expected intermediate outcomes: 0 outcomes; Expected final outcomes: 0 outcomes; Overall conversion rate: 0 %.
Precision and output units
Displayed results: Expected intermediate outcomes in outcomes, rounded to 3 decimal places; Expected final outcomes in outcomes, rounded to 3 decimal places; Overall conversion rate in %, rounded to 2 decimal places. Display rounding does not establish the precision of the original measurements or estimates. A small positive rate can round to 0.00%; inspect the underlying counts before treating displayed zero as an absence of events.
Calculation checks, sources and review limits
How many final outcomes are expected from two sequential funnel rates?
How many final outcomes are expected from two sequential funnel rates? Check the formula, a worked example and the stated measurement limits.
Common uses
- How many final outcomes are expected from two sequential funnel rates
- Compare Two Stage Funnel across scenarios under matching definitions.
How it works
Multiply starting entrants by the first-stage fraction, then by the second-stage fraction. The second rate is conditional on passing the first stage, so percentages are multiplied rather than added.
Worked example
1,000 × 20% = 200; 200 × 25% = 50, or 5% overall. Enter starting entrants 1000 entrants, first-stage rate 20 %, second-stage conditional rate 25 %. The independently worked result is expected intermediate outcomes 200 outcomes; expected final outcomes 50 outcomes; overall conversion rate 5 %. Compare this example with your reporting definitions before substituting your own figures.
FAQ
Should 20% and 25% stage rates be added?
No. If 25% applies only to the 20% who pass stage one, the combined rate is 0.20 × 0.25 = 0.05, or 5%.
Why can expected outcomes be fractional?
An expectation describes the average result implied by the entered rates. It can be fractional even though each realized final event is counted as a whole event.