Stock Profit & ROI Calculator
Calculate net investment gains, taxes, brokerage fees, and break-even share targets.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. No data is ever transmitted across the network.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
How to Use Stock Profit & ROI Calculator
Specify your purchase price per share and the number of shares bought.
Input the selling price per share, brokerage fees, and applicable capital gains tax rate.
View the complete net profit breakdown, percentage ROI, and break-even price.
Frequently Asked Questions
How is break-even share price calculated?
Break-even price equals (Total Buy Cost + Buying Commission + Selling Commission) divided by the number of shares.
How does capital gains tax affect net profit?
Taxes are calculated solely on positive taxable capital gains (Gross Profit > 0), deducting applicable tax from your net proceeds.
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