How is required funnel traffic calculated?

Divide target conversions by the product of the stage rates. For 500 conversions at 40% and 25% it is 5,000 sessions.

Why does required traffic rise so quickly?

Stage rates multiply rather than add. A funnel at 40% then 25% passes only 10% end to end, so each additional leaky stage sharply increases the traffic needed.

Which stage should I fix first?

Usually the weakest, since it constrains everything downstream. Because rates multiply, a gain at any stage lowers the traffic requirement proportionally.

Is it cheaper to fix the funnel or buy traffic?

Fixing the funnel almost always wins, because a better stage rate improves every future visitor while bought traffic must be purchased again each month.

Calculator · 093

Funnel Traffic Calculator

Find the top-funnel traffic a conversion target demands — and decide whether to fix stage rates or buy more traffic.

Target conversions

count

Stage 1 rate

Stage 2 rate

Required top-funnel traffic

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Average

Scenario lens Current · Benchmark · Optimized

Leverage

Formula

Required traffic = Target conversions / (Stage 1 rate × Stage 2 rate)

Understanding funnel traffic requirements

Reference material — the calculator above stays the primary tool.

What this measures

This is the top-funnel traffic needed to produce a conversion target, given the rate at which users pass each stage. Because stage rates multiply, the traffic requirement grows fast as the funnel leaks — a two-stage funnel at 40% and 25% passes only one visitor in ten.

Working backward from the target exposes whether the goal is a traffic problem or a funnel problem.

How to read your result

The headline is the traffic your target demands at current stage rates. The scenario lens then shows how improving the first stage cuts that requirement, pricing the improvement in sessions saved.

Lower required traffic is better — it means the target is reachable without buying more volume.

Why stage rates compound

Multiplied rates shrink throughput quickly. Treat these as orientation.

Context	Typical median
40% × 25%	10% end-to-end
50% × 25%	12.5% end-to-end
50% × 40%	20% end-to-end
Each stage added	Multiplies the leak

Levers that cut the requirement

Because rates multiply, improving any stage lowers required traffic — and improving the weakest stage lowers it most. Fixing a funnel is usually cheaper than buying the traffic that compensates for it. Model a better stage rate as a scenario above.

Funnel traffic in context

Read this alongside funnel drop-off and required traffic to hit revenue, which the related tools cover. Drop-off identifies which stage leaks; this tool prices what that leak costs in traffic you must buy.