Ecommerce and marketplaces

Free Product Margin Calculator.

Per-unit margin calculation with transparent cost breakdown.

Compare product price and cost figures and keep the arithmetic and exclusions visible beside the result.

Chrome extension + account required.
25 free automation tasks/month across tools. Browser-provider limits apply.

WHAT TO HAVE READY

Price, costs, fees and shipping inputs.

YOUR STARTING POINT

A task you can make yours.

Copy it here. Paste it into WebAct when you are ready.

This page prepares your prompt. The task runs in WebAct.

01

Make the task yours.

Review the prompt above. Add your goal and any requirements that matter.

02

Bring it to WebAct.

Open WebAct, paste the task and provide the data and rules. Review any proposed calculation or code action before approving it, then check a known example.

03

Check the useful part.

Check formulas, code and calculations against known inputs in the appropriate runtime. Review actions before execution and keep the original data available.

A PRACTICAL GUIDE

How to use the Product Margin Calculator.

Margin and markup use different denominators. Include the actual costs and state whether fees or shipping are excluded.

Make the workflow fit your task.

Separate selling price from the complete cost basis you intend to include. Calculate unit profit, margin and markup with their different denominators, identifying fees or shipping costs absent from the supplied figures.

What you provide
Price, costs, fees and shipping inputs.
What you get
Per-unit margin calculation with transparent cost breakdown.

See the input and the result.

Illustrative input and output · a teaching example, not a live WebAct run

Example input

Selling price $40; total supplied unit costs $25.

Completed example

Unit profit: $15. Margin: 37.5% of selling price. Markup: 60% of cost.
Download this example

Load this input into the prompt, then copy it to WebAct to try the task. Your result may differ from the illustration.

Decisions and troubleshooting.

Why are margin and markup different for the same product?

Margin divides profit by selling price; markup divides it by cost. Label the denominator so the percentage can be interpreted correctly.

Why is the calculated margin higher than the actual business result?

Review omitted fees, returns, shipping or other costs. The calculation can only reflect the cost basis supplied.

Try it with your own source.

Replace the example with your material in the task prompt. Keep the requirements you need, then copy the task into WebAct.

Customize and copy the task ↑
BEFORE YOU BEGIN

Using WebAct.

The prompt and example are available here. Run your task in the WebAct Chrome extension.

Is this tool free?

You can copy and edit the prompt here for free. To use it with WebAct, install the Chrome extension, create and verify your account, and connect an available browser ChatGPT session. The Free plan includes 25 user-started automation tasks per calendar month, shared across tools. Ordinary browser Chat is separate; provider limits apply.

Learn about shared context in our privacy policy and choosing Chat or Task.

FROM A PROMPT TO YOUR OWN WORK

Bring the task to your page.

Install WebAct, add your source material and make the result yours.

Install WebAct