Tools
Free stock market calculators
Size a trade, check an option payoff or project a dividend. Each calculator works straight away with no account, and shows its formula and a worked example so you can see how the answer was reached.
Trade planning and risk
Decide how much to buy and where you are wrong before you place the order.
- Position size calculatorTurn the amount you can afford to lose into a share count.
- Risk/reward calculatorCompare the planned gain with the planned loss, and the win rate it needs.
- Stop loss calculatorPlace a stop by percentage, dollar distance or ATR and see what it costs.
- Break-even calculatorFind the exit price that covers your commissions and fees.
- Margin calculatorSee the cash required, the loan, the interest and your margin call price.
Options and short interest
Work out option payoffs at expiration and how crowded a short position is.
Returns and cost basis
Measure what a position made, what it cost and how fast it grew.
- Stock profit calculatorNet profit and return on a trade after fees and estimated tax.
- Percent gain and loss calculatorThe percentage move between two prices, and the gain needed to recover.
- Stock average cost calculatorAverage price across purchases, and the shares to reach a target average.
- CAGR calculatorThe steady yearly growth rate between two values.
Long-term growth and income
Project contributions, compounding and dividends over the years.
Built on our news data
Measured from real market reactions instead of the numbers you enter.
Frequently asked questions
Are these calculators free?
Yes. Every calculator here is free to use with no account and no limit. The math runs in your browser, so results update as you type.
How accurate are the results?
The math is exact for the inputs given, and each page shows the formula so you can check it. The results are still estimates, because real trades involve slippage, taxes and fees, and any future return you enter is an assumption.
Is this investment advice?
No. These tools are for education only. They show the math behind a decision, and they don't know your situation or suggest what to buy or sell.
For education only, not investment advice. Results are estimates based on what you enter, and they leave out anything not shown, such as slippage and most taxes. Check the numbers with your broker or a licensed professional before acting on them.