Make a small price calculator before building a website

Choose your starting point

Claude · ChatGPT

The guide is free; the tool feature you use may depend on your account. Open a tool’s introduction for the relevant capabilities and source documentation.

From idea to a useful result

1. Write the rule in plain language and decide what the calculator must not do.
2. Ask for a local prototype or artifact with labeled inputs and an explanation of the formula.
3. Try normal, zero and invalid inputs before sharing. A prototype needs separate work before collecting customer data or payments.

Try this

Create a simple interactive prototype for a fictional printing shop. Price = $10 setup plus $2 per print. Quantity must be a whole number from 1 to 100. Show the formula and total. Use accessible labels. No login, payments, tracking or external requests. Include checks for quantity 1, 10, 0 and 1.5.

What a useful result looks like

Expected checks: 1 → $12; 10 → $30; 0 → validation message; 1.5 → validation message. The page should explain $10 + quantity × $2. This is a specification and acceptance example; the generated page still needs to be run and checked.

Check the result

Do not count a screenshot as evidence that validation works. Try the inputs in the actual prototype.

Original illustrative teaching case. No external model run or product performance comparison is claimed.