MetricKitMetricKitBrowse calculators
Paid Ads

Click ID

A click ID is a unique identifier added to a landing page URL to link a click to an ad interaction (used for attribution and conversion uploads).

Updated 2026-01-24

Definition

A click ID is a unique identifier added to a landing page URL to link a click to an ad interaction (used for attribution and conversion uploads).

How to use it

  • Capture it at landing, persist it (cookie/local storage), and attach it to conversions when allowed.
  • Click IDs help with attribution, but incrementality still requires holdouts or experiments.

Why this matters

This term matters because it affects how you interpret performance and make budget decisions. If you use inconsistent definitions or windows, ROAS/CPA can look "better" while profit gets worse.

Practical checklist

  • Write a 1-line definition for "Click ID" that your team will use consistently.
  • Keep the time window consistent (weekly/monthly/quarterly) when comparing trends.
  • Segment results (channel/plan/cohort) before drawing big conclusions from blended averages.
  • Sanity-check with a related calculator from the same category on MetricKit.
  • Read the related guide (e.g., UTM + GA4 attribution: practical tracking for paid ads (without lying to yourself)) for context and common pitfalls.

Where to use this on MetricKit

Calculators

  • ROAS Calculator: Calculate Return on Ad Spend (ROAS) and estimate contribution profit after ad spend.
  • Break-even ROAS Calculator: Estimate the break-even ROAS based on contribution margin assumptions.
  • Target ROAS Calculator: Estimate a target ROAS to cover variable costs plus a desired margin buffer.
  • Paid Ads Funnel Calculator: Model CPM -> CTR -> CVR to estimate CPC, CPA, ROAS, and profit per 1,000 impressions (with margin and variable costs).
  • ROI Calculator: Calculate Return on Investment (ROI) for a campaign or project.

Guides