Marketing Qualified Lead (MQL) Calculator
Work backward from revenue target to determine how many MQLs marketing must generate.
The B2B Demand Waterfall
The classic B2B demand model: Anonymous traffic → Captured leads → MQL (Marketing Qualified Lead) → SQL (Sales Qualified Lead) → Opportunity → Closed Won customer. Each stage has a conversion rate; multiply them to get end-to-end. A typical B2B SaaS funnel: 100 captured leads → 30 MQL (30%) → 18 SQL (60%) → 11 opportunities (60%) → 3 closed deals (25%). End-to-end conversion: 3%.
The 'right' conversion rates depend on lead source quality. Inbound demo requests convert 30-50% to opportunity; trade show scans convert 2-8%; cold list lead-gen converts 1-3%. Source: Sirius Decisions Demand Waterfall, Forrester B2B benchmarks. Last updated: May 2026.
MQL Definition — The Most-Argued Metric in B2B
'Marketing Qualified Lead' has no universal definition — it's whatever marketing and sales AGREE qualifies. Common criteria: (1) Demographic match (right industry, company size, role), (2) Behavioral score (visited pricing page, downloaded mid-funnel content, attended demo), (3) Lead source (specific high-intent channels). Tight MQL definitions = lower volume but higher SQL conversion. Loose definitions = higher volume but lower conversion and SDR frustration.
The single most useful exercise: a quarterly marketing-sales alignment meeting to redefine MQL. If less than 30% of MQLs convert to SQL, MQL definition is too loose. If sales is asking for more leads at any conversion rate, push to add more behavioral criteria.
Typical 2026 Conversion Rates by Segment
| Stage | SMB SaaS | Mid-Market | Enterprise |
|---|---|---|---|
| MQL → SQL | 40-60% | 30-45% | 20-35% |
| SQL → Opportunity | 50-70% | 40-60% | 30-50% |
| Opp → Closed Won | 20-35% | 15-30% | 10-25% |
| End-to-End | 4-15% | 2-8% | 0.5-3% |
MQL Volume vs Quality — Where to Optimize First
The leverage hierarchy: (1) Improve opp-to-close % via sales coaching, demo quality, and pricing positioning — every 5% improvement adds 25% to revenue at constant volume. (2) Improve MQL-to-SQL handoff via lead routing speed (under 5 min), enrichment data quality, and BDR scripts. (3) Improve top-of-funnel volume only after the bottom-funnel converts well — pouring more leads into a leaky funnel just amplifies the leakage.