ROAS Calculator: Calculate Return on Ad Spend
Calculate ROAS, compare scenarios, and explain what the result can—and cannot—say about campaign profitability.
Works across your stack
Supported AI platforms
7 supported clients. Connector requirements are shown separately below.
+1 Your result
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Enter your numbers to calculate a comparable efficiency metric.
Add the ROAS calculator skill to your AI client
Set up the Adspirer "ROAS Calculator" skill for me. If you can run commands: npx adspirer-skills add roas-calculator If not: fetch https://www.adspirer.com/skills/roas-calculator.md and follow it. Then read the skill and ask me what you need to get started.
Paste it into Claude, ChatGPT, Cursor, Codex, Gemini, or any agent — it works out how to install itself.
Or install it yourself
npx adspirer-skills add roas-calculator Writes SKILL.md to .claude/skills/ in the current project. The bundled references, scripts, and assets ship with the ZIP. Download ZIP →
Upload the ZIP in Claude → Settings → Skills. The bundle preserves every reference, script, and asset.
In ChatGPT, open Plugins → Skills → Create → Upload from your computer. ChatGPT scans the skill before making it available. Availability and upload permissions depend on your workspace plan and admin settings.
npx adspirer-skills add roas-calculator --agent cursor Writes the skill to .cursor/rules/ in the current workspace, so Cursor loads it on every session.
npx adspirer-skills add roas-calculator --agent codex Appends the skill to AGENTS.md, which Codex reads on every session — so it persists instead of living in one conversation. The append is idempotent; re-running it will not duplicate the block.
npx adspirer-skills add roas-calculator --agent gemini Appends the skill to .gemini/GEMINI.md, which the Gemini CLI reads on every session. Connect Adspirer as an MCP server first so the live ad-account steps can run.
npx adspirer-skills add roas-calculator --agent windsurf Writes the skill to .windsurf/rules/ in the current workspace, so Windsurf loads it on every session.
npx adspirer-skills add roas-calculator --agent other Writes SKILL.md to adspirer-skills/ in the current folder — point any agent at that file. No shell? Fetch the raw file with curl -fsSL https://www.adspirer.com/skills/roas-calculator.md, which prints the skill instead of installing it.
Starter prompt
Client setup guide →Use the ROAS Calculator skill. I’m working on [campaign or account] and want to understand [goal or problem] for [date range]. Check that Adspirer is connected, start by looking without changing anything, and explain the story in plain language. Show me the evidence and ask before making any live change.Where it helps
When to use the ROAS calculator skill
A checked ROAS calculation with consistent dates, currency, attribution, and an honest interpretation against the target or break-even point.
Use case 1
A monthly result needs checking
Spend and attributed revenue are available, but the team wants the formula, inputs, and meaning documented before the number reaches a report.
Use case 2
Channels need a blended view
Google and Meta each display a return, and the portfolio needs one correctly weighted result rather than an average of ratios.
Use case 3
ROAS needs a profit reality check
Finance has supplied contribution margin and wants to compare current efficiency with a modeled break-even level.
See it in a campaign
ROAS calculator examples
The numbers, account, and recommendation will be yours. These show the kind of story the skill helps you work through.
DTC monthly review
A retailer reports $42,000 in Shopify-attributed revenue from $9,500 in paid-media spend.
The skill calculates 4.42x ROAS, labels the attribution source, and explains which costs are absent from that ratio.
Blended channel view
Google produces $24,000 from $8,000 spend and Meta produces $18,000 from $4,000 spend.
The skill sums revenue and spend first and reports 3.50x blended ROAS instead of averaging the channel ratios.
Keep reading: Google Ads setup docs ·Claude ad management ·PPC reporting tools guide
Keep building the workflow
Agent skills related to ROAS calculator
CPC Calculator
Calculate CPC, compare traffic costs fairly, and explain why a cheaper click is not automatically a better business result.
CTR Calculator
Calculate CTR, compare engagement on a consistent basis, and explain what the percentage does and does not prove.
Anomaly Triage
Follow the clues behind a sudden campaign change, explain what is happening in plain language, and route the next step to the right person.
Before you install
Frequently asked questions
What is the ROAS calculator skill?
It is an Agent Skill — a folder of instructions your AI assistant loads when you ask it to do this job. It follows the open Agent Skills specification, so the same package works across different assistants. Calculate ROAS, compare scenarios, and explain what the result can—and cannot—say about campaign profitability. Unlike a prompt you paste in, the skill carries its own procedure, checks, and stop conditions, so the assistant works the same way every time you run it.
Which AI assistants can run it?
Claude, Claude Code, ChatGPT, Codex, Cursor, Gemini and Windsurf. Download the ZIP and upload it in assistants that accept skill folders, or point the assistant at the raw SKILL.md file. The install card above has the exact step for each one.
What do I need to connect before I run it?
Adspirer is required, because the skill reads live account data rather than guessing. Google Analytics 4 and Shopify are optional and only add value when the job calls for them. The skill confirms the connection before it touches a real account, and tells you plainly if something is missing.
Do I need an Adspirer account, and is there a free tier?
The skill itself is free to download and MIT-licensed. To let it read or change real ad accounts you need Adspirer connected: the free tier includes 15 tool calls a month, Plus is $49/mo for 150, Pro is $99/mo for 600, and Max is $199/mo for 3,000. You can install the skill and read what it does before signing up for anything.
Can it change my campaigns without asking?
No. Any new campaign Adspirer creates is created paused, enabling a paused or live campaign needs your confirmation, and destructive actions are gated behind an explicit confirmation flag. Spend, publishing, and live changes wait for your approval every time — installing a skill or a connector is not itself approval to act.
How do I get the best results from it?
Give it the specifics it asks for up front — the account or campaign, the date range, the goal, and what "good" looks like for this business. Let the first pass run read-only so you can check the evidence before anything changes. The starter prompt above is a working template; edit the bracketed parts and paste it in.
How is this different from just asking the assistant directly?
A plain prompt gets you a plausible answer from whatever the model already knows. This skill makes the assistant pull real numbers from your accounts and analytics, follow a fixed procedure, show its evidence, and stop at the points where a person should decide. That is the difference between a confident guess and a roas calculator you can act on.
Ready to run it against real campaigns? Connect Google, Meta, Amazon, LinkedIn, TikTok, or ChatGPT Ads to your assistant on the free tier — nothing spends or publishes without your approval. Create a free Adspirer account →