# Paid Media Metrics Handbook

A reference handbook for performance marketers — definitions, formulas, benchmarks, and when to use CPM, CTR, CPA, ROAS, MER, incrementality, and view-through metrics across channels.

**Author:** AdSights Team  
**Category:** analytics  
**Difficulty:** beginner  
**Last Updated:** 2026-06-05

## Overview

### What You Will Learn

Plain-language definitions for the metrics dashboards surface every day.
Formulas and worked examples for CPM, CTR, CPA, ROAS, and MER.
Funnel-stage guidance: which KPI to lead with for awareness vs. conversion.
When platform-reported numbers diverge from finance-grade reporting.

### Who This Handbook Is For

New media buyers, strategists onboarding to paid channels, and cross-functional partners (finance, product) who need a shared vocabulary for campaign reporting.

## Chapters

### 1. Top-of-Funnel Metrics

CPM, reach, frequency, and view rate — what they measure, how to benchmark them, and common misreads.

**Key takeaways:**
- CPM alone does not prove efficient growth; pair with reach and downstream rates.
- Segment CPM by placement and audience temperature before renegotiating targets.

**Key takeaways:**
- Track frequency weekly on retargeting pools.
- Refresh creative when CTR decays alongside rising frequency.

**Key takeaways:**
- View-rate definitions differ by platform.
- Use view rate for hooks; CPA/ROAS for scaling decisions.

### 2. Engagement & Traffic Metrics

CTR, CPC, landing-page behavior, and video engagement signals for creative evaluation.

**Key takeaways:**
- Use CTR for creative comparisons within the same campaign type.
- Pair video CTR with view rate to separate hook strength from offer clarity.

**Key takeaways:**
- LPV rate connects media metrics to on-site behavior.
- Diagnose mobile bounce before blaming audience targeting.

**Key takeaways:**
- Low CPC without conversions is not a win.
- Creative lifts CTR and therefore lowers CPC.

### 3. Conversion & Efficiency Metrics

CPA, ROAS, MER, and incrementality — tying spend to outcomes finance trusts.

**Key takeaways:**
- Set ROAS targets using gross margin, not revenue alone.
- MER is the cross-channel check when platform ROAS disagrees.

**Key takeaways:**
- Run holdout or geo tests before major budget reallocation.
- Document attribution windows whenever you compare periods.

**Key takeaways:**
- Segment promo weeks from baseline ROAS reviews.
- Merchandising is a legitimate ROAS lever.

### 4. Reporting Cadence & Dashboards

Daily, weekly, and monthly views — which metrics belong on each cadence and how to avoid dashboard sprawl.

**Key takeaways:**
- One primary KPI per report reduces misinterpretation.
- Keep platform ROAS in appendix when MER leads executive reviews.

**Key takeaways:**
- Executives need MER; buyers need CTR and CPA diagnostics.

### 5. Metric Definitions Reference

Quick-reference formulas, platform nuances, and attribution caveats for every KPI in this handbook.

**Key takeaways:**
- Document formulas alongside dashboard screenshots.
- View-rate definitions are not portable across platforms.

**Key takeaways:**
- View-through informs creative; clicks drive most scalable spend decisions.

### 6. Cross-Channel Reporting Workbook

Platform naming maps, monthly audit steps, and a weekly worksheet template.

**Key takeaways:**
- Reconcile to source-of-truth revenue monthly.
- Archive mapping docs with each report.

**Key takeaways:**
- Escalate persistent 15%+ efficiency gaps.
- Pair platform KPIs with MER in executive views.

## Frequently Asked Questions

### What is MER and when should I use it?

Marketing Efficiency Ratio (MER) is total revenue divided by total ad spend across all channels. Use it as a sanity check when platform-reported ROAS diverges due to attribution windows or cross-device gaps.

### How is view rate defined on different platforms?

Definitions vary: Meta often uses 3-second views, YouTube uses skippable thresholds, and TikTok emphasizes completion. Compare view metrics within a platform, not across platforms.

### Should I report on last-click or blended attribution?

Report the model your finance team trusts for decisions, and show platform numbers as directional. Blended or MMM-informed views are better for budget allocation than last-click alone.

## Download

The full PDF is available after email capture on the landing page.

Request download: https://www.adsights.ai/resources/ebooks/paid-media-metrics-handbook

Landing page: https://www.adsights.ai/resources/ebooks/paid-media-metrics-handbook