Home › Ideas › A calculator website for one hobby or trade
A calculator website for one hobby or trade
Build a website full of small calculators for one hobby or trade, and earn from ads.
01The idea
What you'd build
Pick one hobby or trade with lots of everyday sums: aquariums, baking, sewing, home brewing, tiling. Build 20–50 small, accurate calculators, each on its own page with a clear explanation. People find them through search. Earn from display ads once traffic grows.
Why now: Building small calculators is now quick with AI help, and many hobby and trade sums still have no simple tool.
02Demand
Is anyone asking for this?
An idea is only worth your time if real people want it. Here's what we found.
- One big calculator website had about 6 million page views a month in 2026.
- One calculator business reported about $12.72 earned per 1,000 page views. Niche, country and ad setup change this a lot.
- A single niche term like "dog food calculator" gets about 1,300 searches a month (keyword tool estimate).
03The gap
Why isn't this solved already?
Big calculator sites cover general maths. Hobbies and trades have many specific sums, like fabric needed for a quilt or tile adhesive for a floor, that have no good, simple tool.
04The pain point
What hurts, and when
People in the middle of a project need one number fast: how much to buy, how long to wait, what size to cut. Doing it by hand leads to mistakes and wasted money.
😣 When it hurts: Standing in a shop or workshop, needing one number now.
05Who needs this
The person you'd build for
- 👤Who they are
- Hobbyists and small tradespeople in the middle of a project.
- 🧰What they use today
- Doing sums by hand, big general calculator sites, or forum posts.
- 📍Where to find them
- Google searches like "how much fabric for a queen quilt", hobby forums and Pinterest.
- 💳Why they'd pay
- Visitors use it free; ads pay. One calculator business reported ~$12.72 per 1,000 page views.
06AI score
How much AI can do
🤖 AI does
- Builds the tool, the pages and the listing
- Runs checks and fixes problems
- Writes posts, emails and replies for you to check
- Turns your numbers into a weekly note
🙋 You do
- Make the accounts and pass ID checks
- Approve what AI makes
- Post, send and talk to buyers
- Handle the money, tax and decisions
AI can also prepare the selling and marketing work: posts, emails and replies. But a person has to do it: post, send and talk to buyers.
How hard is it? Easy.
07Your AI
What to have your AI do
Use any AI assistant you like. One paid plan (~$20 a month) is usually enough. Here's what to have it do:
Search the web for people asking for this, and list who already sells it and their weak spots.
Write the tool step by step, test it, and explain anything you need to do by hand.
Write your website, store listing and help pages in plain words, with no income claims.
Draft posts, emails and replies. You edit them, then post and send them yourself.
Keep your FAQ and refund rules in one saved chat or project, so every reply follows them.
Re-run the tests, check for changes, and turn your weekly numbers into a short note.
08Tools
The other tools you'll need
Your AI plus a few everyday tools. Costs are estimates.
The main AI engine to run your business
~$0–20 a month (estimate)Your own web address, like yourname.com
~$10–15 a year (estimate)Puts your calculators online
~$5 a month (estimate)Shows ads and pays per view. Most need steady traffic first
Free (they keep a share)Shows search engines your pages and how people find you
FreeNeeded for ads in many countries
~$0–10 a month (estimate)Counts visits without tracking people
~$0–9 a month (estimate)The playbook
How to do it, step by step: proof, where to find buyers, the money math, and a prompt for each step.
09Proof
Has anyone made money from this?
🔒 Sections 09–17 are locked
Read the full playbook
10Marketing
Where to find buyers, and a 7-day launch
11Risks
What could go wrong, and what to do
12Your time
How much of your week it takes
13Setup
Step by step, with your AI
14Budget
What it costs
15Money math
Low, middle and high (estimates)
16Stop rule
When to stop
17Prompt pack
Copy the prompt. Paste it into your AI.
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This report is based on outside sources and our own research. All numbers are estimates. It is not financial advice. Results depend on you, and no income is promised.