Put some numbers behind the next decision.

Use a realistic margin.

Sale value is revenue from a typical customer or project. Gross margin is the share left after the direct cost of delivering that sale. If you use revenue as though it were profit, the calculation will make the fee look easier to recover than it is.

For the close rate, use the share of comparable inquiries that become paying customers. If you do not have a reliable number, compare several assumptions and keep the uncertainty visible.

This calculation excludes taxes, fixed overhead, other marketing costs and the time before a campaign produces results. Consider those costs separately when setting a budget.

An example of the arithmetic

A hypothetical $1,500 sale at a 35% gross margin contributes $525 before fixed overhead. If one in five inquiries becomes a sale, the expected contribution per inquiry is $105.

At a $325 monthly SEO fee, the calculation rounds $325 divided by $105 up to four additional inquiries. These are illustrative inputs, not figures from a client or a forecast for your business.

A small sample can behave very differently from an average. Four inquiries might produce no sale, one sale or more. The tool helps compare assumptions; it cannot remove that uncertainty.