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Marketing Projection Calculator

Apply proportional scaling (rule of three) to your marketing numbers: enter a known result (investment, time in days, or another base, and leads, clicks, or sales) and find the projection for a new scenario or goal.

What do you want to project?

What's your comparison base?

Simple rule of three

No comparison base or projection — just the classic proportion. Fill in A, B, and C, and result X shows up below.

is to

as

is to

—

Result

Value of X

—

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How the calculator works, in practice

$100 → 5 leads

a real result from a past campaign

What each part of the math means

Understand the rule of three behind the projection.

Comparison base

Investment, time (days), or any other reference — pick whatever fits your scenario, like 'in 10 days I sold 20 orders'.

A result you already had

A real base value and result (leads, clicks, sales, revenue, or another metric) from a recent campaign or period. It's the reference for the whole projection.

Rule of three (cross multiplication)

The same ratio between base and result is applied to the new scenario — if 10 days generates 20 orders, 30 days generates 60, keeping the rate constant.

Projection both ways

Enter a new base value to see the projected result, or flip the math: enter a target result and find the base value needed to reach it.

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Tips about proportional projections

  • The rule of three assumes a linear relationship — it works well for small to moderate changes, but a much larger base (more budget, more days) can saturate the audience or market and change the result rate.
  • Use a recent base result (last 30-60 days) to keep the ratio realistic — old or seasonal data will skew the projection.
  • If the base is time (days, weeks), watch out for seasonality: weekend, holiday, or promotional-date sales don't follow the same rate as the regular days used in the base.
  • After applying the new value, compare it to the real result and recalculate the ratio — that recalibrates the projection for next time.
  • The reverse projection (how much to invest, or how many days to wait, to hit a target) is great for planning, but treat it as an estimate, not a guarantee.
  • Different metrics scale differently: clicks tend to grow almost linearly with spend, while leads and sales may need more budget or time per unit as the best-qualified audience runs out.
Read the complete guide to leads on our blog
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Frequently asked questions about the rule of three in marketing

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