Break-Even Lead Cost Calculator

Many businesses ask whether a cost per lead is good or bad, but the real answer depends on close rate, customer value, and margin. This calculator shows your break-even CPL and a target CPL that protects profit.

What this calculator does

Calculate the maximum cost per lead before profit disappears, then set a healthier target CPL.

How to use it

Enter average customer value, close rate, gross margin, and desired profit margin. The calculator estimates revenue value per lead, gross profit per lead, break-even CPL, and target CPL.

Formula and assumptions

• Revenue value per lead = average customer value × close rate.
• Gross profit per lead = revenue value per lead × gross margin.
• Target CPL = gross profit per lead × (1 − share of gross profit retained).

Assumptions

• Close rate should be calculated from qualified leads.
• If lead quality varies by channel, calculate break-even CPL separately by channel.
• Target CPL should preserve profit after fulfillment and marketing costs.

Model details and limits

• The retention percentage is the share of gross profit per lead kept after acquisition cost, not a net margin on revenue. Target CPL equals gross profit per lead multiplied by one minus that retained share.
• Break-even CPL uses all modeled gross profit per lead and leaves nothing for fixed overhead, taxes or other unentered costs. Use qualified leads and channel-specific close rates; retain a buffer appropriate to your business.

Worked example

At $2,500 customer value and 20% close rate, expected revenue per lead is $500. A 50% gross margin gives $250 gross profit and break-even CPL. Retaining 30% of gross profit leaves a $175 target CPL and $75 buffer per lead.

Methodology references

• Google Ads conversion tracking metrics

How to interpret your result

If your actual CPL is higher than break-even, the lead source is unprofitable unless customer value, close rate, or margin improves.

Next steps

Set profitable lead targets