8 Essential Digital Marketing Formulas With Examples (2026)

Basic formulas of digital marketing to improve the campaign performance

You do not need to memorize dozens of formulas to run digital marketing well. You need a handful, and you need to know what each one tells you. Here are the 8 essential digital marketing formulas for 2026, with a plain-English meaning and a quick example for each.

The 8 formulas every marketer should know

MetricFormulaExample
CTR (click-through rate)Clicks ÷ Impressions50 clicks ÷ 5,000 = 1%
CPC (cost per click)Cost ÷ Clicks$100 ÷ 50 = $2.00
CPM (cost per 1,000 views)(Cost ÷ Impressions) × 1,000($100 ÷ 5,000) × 1,000 = $20
CVR (conversion rate)Conversions ÷ Clicks5 ÷ 50 = 10%
CPA (cost per acquisition)Cost ÷ Conversions$100 ÷ 5 = $20
ROAS (return on ad spend)Revenue ÷ Ad spend$400 ÷ $100 = 4x
CAC (customer acquisition cost)Total cost ÷ New customers$1,000 ÷ 20 = $50
LTV:CACLifetime value ÷ CAC$150 ÷ $50 = 3:1

Two rules that keep you accurate

  • Never average a ratio. To get a blended CPA or CTR across campaigns, rebuild it from totals (total cost ÷ total conversions), do not average the per-campaign numbers. Averaging the averages gives the wrong answer.
  • 3:1 is the healthy LTV:CAC benchmark. Below roughly 1:1 you lose money per customer; far above 3:1 can mean you are under-investing in growth.

For a deeper walk-through of the funnel math and the traps that catch people, see our media math cheat sheet on this blog.

Frequently asked questions

What are the most important digital marketing formulas?

The core eight are CTR, CPC, CPM, CVR, CPA, ROAS, CAC, and LTV:CAC. They cover cost, efficiency, and value, and together let you judge whether a campaign is working.

How do you calculate ROAS?

ROAS = revenue divided by ad spend. If you earn $400 from $100 of ad spend, your ROAS is 4x. It measures media efficiency, while a fully loaded metric like CAC includes all acquisition costs.

What is a good LTV:CAC ratio?

3:1 is the widely used healthy benchmark. Below about 1:1 you lose money on each customer; far above 3:1 often signals you are under-investing in growth.

Why shouldn't you average marketing ratios?

Because a simple average weights every campaign equally regardless of size, which distorts the result. Always rebuild a blended ratio from totals, such as total cost divided by total conversions for CPA.

Related reading on this blog

Location: Toronto, ON, Canada

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