Lead Magnet ROI Calculator accuracy and testing

Formula source

• Leads = visitors * opt-in rate. Gross lead value = leads * value per lead. Total cost = creation cost + traffic cost + leads * delivery cost per lead + fee percent * gross lead value. ROI = (gross lead value - total cost) / total cost * 100.

Test cases

Known limitations

• These calculators do not connect to ConvertKit, email service providers, webinar platforms, ad platforms, or payment processors. They do not model deliverability changes, attribution windows, refunds, taxes, list fatigue, customer support load, or cohort-level retention unless you enter those assumptions yourself.

Assumptions

• Funnel results are estimates based on user-entered assumptions.
• The calculator uses only the conversion rates, values, costs, and fees you enter.
• Calculations are deterministic and run locally in your browser without uploading funnel data.
• Results do not predict deliverability, list quality, refunds, ad approval, platform changes, or future audience behavior.

Unit handling

• Visitors accepts numeric values.
• Opt-In Rate accepts values in %.
• Value per Lead accepts values in $.
• Creation Cost accepts values in $.
• Traffic Cost accepts values in $.
• Delivery Cost per Lead accepts values in $.
• Fee Assumption accepts values in %.
• Estimated Lead Magnet ROI is displayed as a percentage.
• Estimated Net Profit is displayed as currency.
• Cost per Lead is displayed as currency.

Rounding rules

• Number displays use up to 2 decimal places in the calculator UI.
• Currency outputs are displayed with standard US dollar formatting.
• Percent outputs are displayed with two decimal places.
• Input precision follows configured step values where provided.

Version history

Change log