/ Opening

Media math is just units and meaning

Most media metrics are simple ratios. The hard part is knowing what the number can and cannot tell you.

THE PROBLEM

Numbers feel objective.

But the same number can be useful, misleading, or irrelevant depending on the media job.

TODAY'S JOB

Calculate then interpret.

We will use basic formulas, then decide what each number actually means.

TAKEAWAYA metric is only useful when you know the job it measures and the decision it should affect.

/ Quick Match

Which metric answers which question?

Match each question to the most relevant metric. Some metrics may be useful but incomplete.

QUESTIONBEST STARTING METRICWHAT IT HELPS ANSWERWHAT IT DOES NOT PROVE

How much did we deliver?Impressions / reachExposure volume and unique audienceWhether people cared or acted

How often did people see it?FrequencyRepetition per reached personWhether the message was understood

How efficient was delivery?CPMCost per thousand impressionsQuality of the audience or placement

How many responded?CTR / CVRClick or conversion rateIncremental business value

TAKEAWAYDifferent metrics answer different questions. Do not use one number as proof of the whole campaign.

/ Metric Basics

The formulas are simple. The meaning is conditional.

Learn the formulas, then attach each to the decision it supports.

CPM

Cost per 1,000 impressions

Useful for delivery efficiency, not proof of impact.

CTR

Clicks / impressions

Useful for response rate, not proof of qualified demand.

CPC

Cost per click

Useful for traffic efficiency, not proof of business quality.

CPA / CPL

Cost per action or lead

Useful when the action is meaningful and comparable.

ROAS

Revenue / ad spend

Useful for revenue return, incomplete without margin and attribution context.

TAKEAWAYFormula fluency is the floor. Strategic interpretation is knowing the limits of each metric.

/ Worked Example

Calculate the campaign before you judge it

A campaign spent $10,000 and produced 1,000,000 impressions, 5,000 clicks, 250 leads, and $40,000 in attributed revenue.

CPM$10$10,000 / 1,000,000 × 1,000

CTR0.5%5,000 clicks / 1,000,000 impressions

CPC$2$10,000 / 5,000 clicks

CPL$40$10,000 / 250 leads

ROAS4:1$40,000 / $10,000

TAKEAWAYCalculation tells you what happened numerically. It does not yet tell you whether the campaign was good.

/ Common Trap

Do not compare unlike channels with the same hero metric

A high-intent search campaign and a broad-reach video campaign may both matter, but they are not built to do the same job.

BAD COMPARISON

Search has a higher CTR, so search is better.

This ignores intent, scale, creative role, audience stage, and what the video was supposed to do.

BETTER COMPARISON

Did each channel perform the job it was assigned?

Search may capture demand. Video may build familiarity, explanation, or reach that supports later demand.

TAKEAWAYJudge a channel against its job, not against another channel’s strongest metric.

/ Team Challenge

Calculate, then explain what it means

You are given two campaigns. Calculate key metrics, then decide what each number can and cannot prove.

CAMPAIGNSPENDDELIVERYRESULT

Search$8,00010,000 clicks400 leads

Video$8,000800,000 impressions1,600 site visits

AssignmentCalculate CPC or CPM, response rate where possible, and one fair decision each metric could support.

TAKEAWAYThe correct answer is not only the calculation. It is the decision the calculation should and should not influence.

/ Pressure Test

What decision does the number justify?

Use these questions before changing budget, creative, or channel mix.

1.What job was this channel assigned?

2.What does the metric directly measure?

3.What does it not prove?

4.What comparison would be unfair?

5.What missing data would change the decision?

TAKEAWAYEvery metric should lead to a bounded decision, not a broad claim about performance.

/ Close

Media math without fear

You do not need to pretend every number is strategic. Use the right calculation, ask what it really measures, and tie it to a decision.

CALCULATEUse the correct unit

INTERPRETName what it means

LIMITName what it does not prove

DECIDEConnect to one action

TAKEAWAYMedia math is useful when it clarifies delivery, efficiency, response, and outcomes without pretending one metric explains everything.