MQL to SQL rate is Sales Qualified Leads divided by Marketing Qualified Leads.
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An MQL to SQL conversion rate calculator measures how many of your Marketing Qualified Leads actually get accepted by sales as Sales Qualified Leads. It is one of the clearest signals of whether marketing and sales agree on what counts as a genuinely sales-ready lead.
A Marketing Qualified Lead has shown enough engagement, such as downloading content or fitting a target profile, that marketing considers them worth passing along, while a Sales Qualified Lead has been reviewed and accepted by sales as someone worth actively pursuing. The gap between the two stages is where lead quality gets tested.
A team can generate a large volume of MQLs that still converts to SQLs at a low rate if the qualification criteria are too loose or misaligned with what sales actually wants to see. Tracking this rate over time, alongside your cost per lead, shows whether marketing is generating leads that are genuinely valuable or simply generating volume.
Tightening MQL scoring criteria to better match what sales actually closes, improving lead routing speed, and getting marketing and sales aligned on a shared definition of a qualified lead are the most common levers. Since this rate depends heavily on your own funnel definitions and industry, it is more useful to track your own trend over time than to compare against an external benchmark, ideally alongside your customer acquisition cost to see the full picture.
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