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  1. Describe
  2. Look
  3. Copy & paste
  4. Publish
Own the page, not a widget

Describe the maths. Get a working calculator.

In plain words, the way you'd explain it to a colleague. No formula editor, no spreadsheet, no monthly fee to keep it online.

1

What should it work out?

Say what goes in and what should come out. If there's a rule connecting them, say that too, in words.

It's a
Type it here
Or start from one of these:
  • Name every input and the result
  • Say which units you want
  • Ask it to show the working, not just a total
2

Pick a look

Two quick choices — skip them and we'll decide for you. Change any of it later.

Main colour
3

Copy it, then bring back the reply

One tap copies everything. Paste it into an AI, then drop what it gives you back below.

Then open one of these and paste it in. All three are free.
Paste the AI's reply here All of it, or just the code block. We'll sort out the rest.
4

Try it, name it, put it online

This is your real page, running. Have a play before anyone else sees it.

Your page
Your page appears here Paste the AI's reply above and it runs right here, for real.
Your site gets its own address. Pick what it says.

No account. No card. Live for 48 hours, and claim it free any time to keep it forever.

The decision that matters

A widget inside a page, or a page of your own?

Both give you a working calculator. Only one can be found by somebody who does not know you exist.

An embedded widgetYour own calculator site
Where it livesIn a frame inside a page you already haveAt its own web address, as the whole page
Can it rank in search?No. The content sits inside a frameYes. Its own title, description and address
Can it run ads?Not yoursYes, with your own AdSense account
Ongoing costA monthly subscription, usually per widgetFree on a clickto address, $7/mo for your own domain
If you stop payingThe widget stops renderingFree sites stay up. Export the code whenever

You can still embed it. Publish here and put an iframe on your existing site pointing at the address. You get the widget and the standalone page that ranks.

Why some get used and some don't

What makes a calculator worth finding

All three of these are already in the prompt above, so you get them without asking.

It answers while you type

No submit button, no reload. The number moves as the input changes, which is what makes people try three scenarios instead of one.

It shows the working

A total is fine. A total plus the breakdown that produced it is what gets bookmarked, and what makes somebody trust the answer.

It remembers last time

Settings kept in the browser, so a repeat visitor picks up where they left off rather than re-entering everything.

Pick a narrow one. "Calculator" is unwinnable. "Paint coverage calculator for a room" is a search with an answer, and a page that answers it exactly tends to beat a general one.

Questions

Asked and answered

Can I embed this in my existing website?

Yes, with an iframe pointing at your published address. But the reason to build one here is the opposite: a calculator on its own address can be found in search and can carry ads, and an embedded widget cannot do either.

How do I write the formula?

In words. Describe what goes in, what comes out and how they relate, the way you would explain it to a colleague. You never write a formula into a field.

What if the numbers come out wrong?

You will see it immediately, because the calculator runs in step 4 before you publish. Type a case you know the answer to, and if it is wrong, say what it should have been and paste the corrected version back in.

Can it handle more than simple arithmetic?

Yes. Tables, schedules, charts, sliders, unit switching and results that update as you type are all normal. Anything that runs in a browser without a server is in range.

Do visitors need an account to use my calculator?

No. It is an ordinary web page. Somebody opens the link and uses it, with nothing to install and nothing to sign into.

Other things people build

Not quite what you meant?