Free Stock Market Calculators

These free calculators help you work through the everyday math of investing - from a stock's dividend yield and P/E ratio to how many shares to buy, the profit on a trade, and the federal tax a sale might owe. Each one runs entirely in your browser: nothing you enter is saved, sent, or tracked.

Calculators are a starting point for understanding, not a recommendation to buy or sell anything. When you want to put the numbers into practice, you can trade real stocks at real market prices with virtual money in CustomStocks - no account, no real money at risk.