DEV3 Profit Margin and Markup Calculator — Source Code (React + Tailwind)

Source code of the DEV3 Profit Margin and Markup Calculator, a margin, markup and break-even calculator that converts between cost, price, margin and markup and solves for break-even units and revenue.

Download: buy a licence and the ZIP is waiting in Account → Downloads. Try it live: https://dev3.tech/tools/profit-margin-markup-calculator shows the finished tool running.

What is in the download

• A standalone Vite + React + TypeScript + Tailwind CSS project: src/tool holds the tool, shared pieces sit beside it
• package.json with exact versions plus a lockfile, so npm ci works
• README.md (run, build, embed in Next.js or plain React) and an MIT LICENSE

What the code does

• Four input modes: cost+price, cost+margin, cost+markup, price+margin
• Break-even units and revenue with an optional profit target
• Contribution margin shown next to the results
• Copy-ready summary line

Tech stack

React 19, TypeScript, Vite, Tailwind CSS 4.

Install and customise

The How to install and How to use tabs list the steps. In short: unzip, npm ci, npm run dev, then copy the tool folder into your own app if you want to embed it.

Good to know

• A browser-only tool: there is no backend or database in the code.