Lab component 13

What the same money does in an index fund instead

Most SEO ROI calculators are built to produce a large number. This one shows the months you spend underwater, the range of plausible outcomes rather than one confident line, and an implied annual return you can set beside any other use of the same capital.

Live model Shows the downside Not a forecast

Cumulative net position · SEO against passive returns on the same money

The investment

Monthly budget The same amount is applied to every option, so the comparison is like for like.

Horizon

What the research says is reachable

Mature monthly sessions This is the single most important input, and it should come from keyword research, not optimism.

Months to maturity Competitive verticals and weak domains sit at the high end.

Unit economics

Session to customer rate All the way to a closed customer, not to a form fill. Using a lead rate here is the most common way these models end up wrong by an order of magnitude.

Value per conversion

Gross margin Revenue is not return. Only the margin is yours.

Comparison and stress test

Index return A long run historical average, not a prediction. Real returns vary and can be negative.

Savings rate The genuinely risk free floor. If a channel cannot beat this, it is not an investment.

Stop spending after Drag this below the horizon to see what the programme leaves behind once you stop paying.

SEO Index fund Savings SEO range, 25th to 75th outcome

What this model does not know That the mature session ceiling is actually reachable, which is the assumption carrying the most weight here. It also ignores algorithm disruption, inconsistent execution, tax treatment (a retainer is deductible operating expense, a capital gain is not), the internal team hours SEO consumes, and the fact that an index fund is liquid on any trading day while rankings are not liquid at all. This is a model for comparing the shape of returns, not a forecast, and it is not financial advice.

Most SEO ROI calculators are built to produce a large number. This one is built to produce an argument you can defend in a finance meeting, which means it shows the months where you are down, the range of outcomes rather than a single line, and an implied annual return you can set beside any other use of the same capital.

Two different shapes, not two different sizes

The useful comparison is not which number ends up bigger. It is that these produce returns in fundamentally different shapes, and the shape determines whether a programme is appropriate for a given business at a given moment.

Passive capital is smooth and liquid

A broad market fund compounds gently from day one and can be sold on any trading day. It is boring on purpose, and that is exactly what makes it the right baseline to measure against.

SEO is a J curve

You are underwater for months before anything happens, then the return compounds because the asset keeps producing without a matching increase in spend. The early loss is not waste, it is the cost of the asset.

Illiquidity has to be paid for

You cannot sell rankings on a Tuesday. A programme that merely matches the index is therefore worse than the index, because you took on execution risk and gave up liquidity for the same return.

The corollary is uncomfortable and worth saying out loud: if the keyword research does not support a meaningful ceiling, or the margin on a conversion is thin, this model will show the money doing better sitting in an index fund. That is a real answer, and a consultant whose calculator cannot produce it is not modelling, they are selling.