Stock Profit Calculator
A stock profit calculator determines your gain or loss from stock investments, including percentage returns and total profit after fees and taxes.
Stock Profit Formulas
| Metric | Formula |
|---|---|
| Total Profit | (Sell Price - Buy Price) × Shares |
| Percentage Return | ((Sell Price - Buy Price) / Buy Price) × 100 |
| Net Profit | Gross Profit - Commission - Taxes |
| Annualized Return | ((End Value / Start Value)^(1/years) - 1) × 100 |
Example: Stock Trade Analysis
| Detail | Value |
|---|---|
| Buy Price | $50.00 |
| Shares | 100 |
| Total Investment | $5,000 |
| Sell Price | $75.00 |
| Gross Proceeds | $7,500 |
| Gross Profit | $2,500 |
| Percentage Return | 50% |
| Commission (both ways) | $10 |
| Capital Gains Tax (15%) | $373.50 |
| Net Profit | $2,116.50 |
Stock Profit Calculator Implementation
``javascript
function calculateStockProfit(buyPrice, sellPrice, shares, commission = 0, taxRate = 0) {
const costBasis = (buyPrice * shares) + commission;
const grossProceeds = (sellPrice * shares) - commission;
const grossProfit = grossProceeds - costBasis + (commission * 2); // Add back both commissions
const actualGain = sellPrice * shares - buyPrice * shares;
const taxableGain = Math.max(0, actualGain);
const taxes = taxableGain * (taxRate / 100);
const netProfit = actualGain - (commission * 2) - taxes;
return {
costBasis,
grossProceeds,
grossProfit: actualGain,
percentageReturn: ((sellPrice - buyPrice) / buyPrice * 100).toFixed(2) + '%',
taxes: taxes.toFixed(2),
netProfit: netProfit.toFixed(2)
};
}
console.log(calculateStockProfit(50, 75, 100, 5, 15));
// Shows detailed profit breakdown
``
Tax Considerations
Long-term capital gains (held >1 year) are taxed at 0%, 15%, or 20% depending on income. Short-term gains are taxed as ordinary income (up to 37%). Holding longer usually reduces taxes significantly.