Lookalike Audience Expansion Calculator

How to calculate Lookalike audience expansion calculator?

This calculator estimates how many people you can reach by expanding a seed audience into lookalike segments at different percentages, subject to the target country's population cap.

Key formula: Projected Audience = min(Target Country Population, Target Country Population * (Lookalike Percentage / 100))

Using the Lookalike audience expansion calculator calculator: an example

Example inputs — Seed audience: 100,000; Target population: 50,000,000; Lookalike percentages: 1% and 5%.

Step-by-step calculation:

1. Compute 1% of the target population: 50,000,000 × 0.01 = 500,000 → Projected Audience (Lookalike 1) = 500,000.
2. Compute 5% of the target population: 50,000,000 × 0.05 = 2,500,000 → Projected Audience (Lookalike 2) = 2,500,000.
3. Calculate the difference: 2,500,000 − 500,000 = 2,000,000 additional people.
4. Percentage increase: (2,000,000 / 500,000) × 100 = 400% larger reach at 5% versus 1%.

Frequently Asked Questions

How does the seed audience affect results?

The seed audience defines the characteristics used to build lookalikes. Projected sizes are usually derived from the target population percentage and may exceed the seed size.

Why can projected audiences be larger than the seed audience?

Lookalike percentages represent portions of the broader population; a 1% lookalike of a large country can be far larger than the original seed, because the seed only supplies the profile, not the final scale.

Should I always choose a larger percentage for more reach?

A larger percentage increases reach but reduces similarity to the seed. Select the percentage that balances scale and relevance for your campaign objectives.