~1 min read
What Is a Sales Funnel Calculator?
A sales funnel calculator models the progression of prospects through each stage of your pipeline — from raw leads to closed customers — so you can project revenue and identify the weakest stage.
Standard B2B Funnel Stages
| Stage | Typical Conversion Rate |
|---|---|
| Lead → MQL | 20–40% |
| MQL → SQL | 30–50% |
| SQL → Opportunity | 40–60% |
| Opportunity → Close | 20–30% |
| Overall Lead → Customer | 1–5% |
Overall Funnel Conversion
Overall Conversion = New Customers / Leads × 100
An overall conversion rate of 1–3% is typical for B2B SaaS. Above 5% is excellent and usually indicates strong brand/inbound signals.
Finding Your Bottleneck
The stage with the lowest conversion rate relative to benchmark is your constraint. Doubling your lead volume with a broken MQL→SQL stage produces the same number of customers — just twice the waste.
Revenue from the Funnel
Monthly Revenue = New Customers × ACV
Model multiple scenarios: optimistic (improve one stage by 10%), base, and pessimistic (leads drop 20%) to stress-test your pipeline.