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Hey AI Breakers 👋

A PDF lead magnet gets downloaded and forgotten. A calculator that tells someone their own number gets used, bookmarked, and sent to a colleague. 🔢

Today, you’ll build an AI Lead Calculator Studio inside Claude Code that turns one question your buyers already ask into a live, on-brand calculator that collects emails.

Let’s build it 👇

🧠 How the AI Lead Calculator Studio Works

A PDF says “here’s what I know.” A calculator says “here’s your number,” and that’s why people come back to it.

The Studio runs seven chained prompts in one Claude Code project:

  • 🗂️ Brief: Claude Code learns your business, buyer, offer and brand

  • 🎯 Pick: you choose the one question buyers want answered

  • 🧮 Spec: the math goes into a plain-English file you can check

  • 🧱 Build: one index.html with the design, the math and the form

  • 🧪 Test: Claude Code tries to break its own math, then fixes it

  • 📬 Capture: the result turns into a signup and a follow-up email

  • 🚀 Launch: a live link, plus a snippet for your website

The old way: a developer brief, a quote, and weeks of back-and-forth for a “simple” calculator.

The Studio way: about an hour in Claude Code, and a file you own forever

You need Claude Code and the email tool you already use. You’ll type into Claude Code, but you never write code yourself.

🗂️ Prompt #1 → The Project Brief (Teaching Claude Code Your Business)

Every later prompt reads the file this one creates. Get it right here, and you never explain your business again.

The goal:

  • A CLAUDE.md file with your business, buyer, offer, and brand

  • Hard rules against invented numbers, written down once

  • A site/ folder for the only file that ever goes public

✅ Use this to stop re-explaining your business at the top of every prompt.

Make a new folder called lead-calculator, open it in your terminal and type claude. Then paste this.

Prompt:

You are a conversion-focused web strategist who builds simple
lead tools for small businesses.

Set up a project for a free online calculator that will bring
me leads.

My business: [WHAT YOU DO IN ONE SENTENCE]
My buyer: [WHO BUYS FROM YOU, e.g. owners of 5 to 50 person
agencies]
My paid offer: [WHAT YOU SELL + PRICE OR PRICE RANGE]
My email tool: [e.g. MailerLite, Kit, Mailchimp]
My website: [URL]
Brand colors: [HEX CODES, or "pick them from the screenshot
I attached"]
Brand font: [FONT NAME, or "a clean system font"]
My voice: [3 WORDS, e.g. direct, warm, no jargon]

Do these things:

1. Create CLAUDE.md in this folder with a short, factual brief
   of everything above. No marketing language.
2. Add a section called "Calculator rules" with these rules:
   - Every number on the page is typed by the visitor or is an
     assumption I gave you, shown on the page and editable
   - Never invent industry averages, benchmarks or statistics
   - The visitor's numbers never leave their browser. Only the
     email they choose to submit is sent anywhere
   - One file: HTML, CSS and JavaScript together, no
     frameworks, no build step
3. Create an empty folder called site/. Only site/index.html
   will ever go online.
4. Show me CLAUDE.md and ask me to correct anything wrong.

Do not skip step 4.

💡 Tip: Don’t know your hex codes? Drag a screenshot of your homepage into the Claude Code window and ask it to pick the colors.

🎯 Prompt #2 → The Calculator Picker (The Number Your Buyer Already Wants)

The best calculator answers a question your buyer asks right before they buy, like “What will this cost me?” or “Is it worth it?”

The goal:

  • 5 calculator ideas tied directly to your paid offer

  • Each one scored on how badly your buyer wants the answer

  • One winner, with its inputs and its result

✅ Use this to build the calculator people use, not the one that’s easiest to make.

Prompt:

You are a lead generation strategist who designs interactive
tools for service businesses and small software companies.

Read CLAUDE.md.

Here are the questions prospects ask me before they buy:
[PASTE 5 TO 10 QUESTIONS FROM SALES CALLS, DMS OR EMAILS]

Propose 5 free calculators my buyer would actually use.
Mix these types:
- Cost: "What will this cost me?"
- Loss: "How much is this problem costing me right now?"
- Return: "What do I get back if I fix it?"
- Readiness: "Am I ready for this, and what is missing?"

For each calculator give me:
1. A name and the one question it answers
2. The 3 to 6 inputs the visitor types (numbers they know
   without looking anything up)
3. The result they see: one headline number plus one sentence
4. Why someone would trade an email for the full breakdown
5. How the result leads naturally to my paid offer
6. A score from 1 to 5 for: urgency, easy inputs, surprising
   result, fit with my offer

Rank them and recommend one. Do not build anything yet.

🧠 Tip: Inputs people know off the top of their head (”hours a week on invoices”, “new clients a month”) keep them on the page. Anything that needs a spreadsheet loses them.

🧮 Prompt #3 → The Formula Spec (Getting the Math Right Before Any Code)

A calculator with wrong math is worse than no calculator. So the math goes into a plain-English file you can check before a single line of code exists.

The goal:

  • Every input with a default, a minimum and a maximum

  • The formula in plain English, with every assumption labelled

  • 3 worked examples you can check on your phone’s calculator

✅ Use this to catch the mistake now, not after a prospect screenshots it.

Prompt:


Read more

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