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. Zero egress.
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.
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.
Break-even price equals (Total Buy Cost + Buying Commission + Selling Commission) divided by the number of shares.
Taxes are calculated solely on positive taxable capital gains (Gross Profit > 0), deducting applicable tax from your net proceeds.
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