What is CalculaMargem?
CalculaMargem is a portal of free tools built for entrepreneurs, shop owners, marketplace sellers and small businesses who need to accurately calculate the profit margin, markup and selling price of their products.
Created with a simple goal: make pricing knowledge accessible — knowledge that's often buried in complex spreadsheets, paid courses or technical finance books.
Why we built CalculaMargem
One of the most common mistakes in retail is confusing profit margin with markup. Many business owners apply a 30% markup believing they'll end up with a 30% margin — and only realize the problem once the books close in the red.
On top of that, anyone selling on marketplaces faces a maze of fees, commissions and shipping costs that make pricing even more complex. A simple percentage calculator isn't enough for that scenario.
CalculaMargem was built to solve these problems with:
Practical tools
Interactive calculators that work instantly in your browser, with no sign-up or installation required.
Educational content
Guides, real examples by industry, explained formulas and a complete FAQ on pricing.
Real-world context
Examples with real marketplace fees and practical local tax and cost considerations sellers actually face.
Free, with no barriers
No sign-up, no subscription, no usage limits. Use it as many times as you need.
What you'll find on CalculaMargem
Margin Calculator
Find your profit margin and markup from cost and selling price — or calculate the ideal price from your target margin.
Markup Calculator
Simple markup, selling price by markup, and divisor markup accounting for all variable costs and taxes.
Selling Price Calculator
Find the ideal selling price accounting for all costs, marketplace fees and your target net margin.
Discount Calculator
See exactly how a discount impacts your margin before offering it to a customer.
Beyond the calculators, the site offers complete guides on pricing strategy, how to calculate markup, gross margin, net margin and much more.
Our commitment to you
- Free forever: all tools and content are, and will remain, free to use
- Privacy: we don't collect personal data, and the values you enter into the calculators never leave your browser
- Accuracy: every formula is based on correct financial definitions, with verified, practical examples
- Up to date: we keep the site current with real marketplace fees and changes in relevant tax rules
Contact and Suggestions
Found an error in a formula? Have a suggestion for a new calculator or content? Want to report a technical issue?
Get in touch by email: ruthenio@gmail.com
Your feedback is always welcome and helps us improve the tools for every user.