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Trading Calculators
Every calculator runs in your browser. Nothing you type is sent anywhere, stored, or logged, and there is no account to create.
Practice
Learn the mechanics with nothing at stake.
Risk and sizing
The arithmetic that decides long-term results.
Positions and trades
Working out what a trade cost and what it made.
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What did this trade net?
Stock Profit Calculator
Net result of a trade after commissions, in dollars, percent and R. Long or short.
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What is my real cost basis?
Stock Average Calculator
Weighted average cost across multiple purchases, plus break-even price and unrealised P&L.
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What does a split do to my holding?
Stock Split Calculator
How a forward or reverse split changes your share count, price and cost basis.
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What does this option pay at expiry?
Options Profit Calculator
Profit, loss and breakeven for calls and puts at expiry, with a payoff diagram.
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Income and growth
Dividends, yield and compounding over time.
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What will this portfolio pay me?
Dividend Calculator
Project dividend income over time, with reinvestment and dividend growth.
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Is this yield sustainable?
Dividend Yield Calculator
Yield, yield on cost and the payout ratio that shows whether a dividend is affordable.
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How does an account grow over time?
Compound Growth Calculator
Project an account forward with compounding returns and regular contributions.
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Company numbers
Sizing up the business behind the ticker.
Why sizing tools matter more than charting tools
Two traders can take identical trades (same entries, same exits, same timing) and one finishes the year up while the other blows up. The difference is almost never the analysis. It is the size of the positions and the consistency of the risk.
That is why these calculators focus on the arithmetic of risk rather than on indicators or signals. The questions they answer (how many shares, is this worth the risk, what did that cost me) are the ones that compound into results over hundreds of trades.
If you are new, start with the position size calculator and read the risk management guide alongside it.
About these tools
Are these tools really free?
Yes. There is no sign-up, no account, no email required and no usage limit. Every calculator runs entirely in your browser using JavaScript, which is also why they work instantly and continue to work offline once the page has loaded.
Is my data stored or sent anywhere?
No. The numbers you type never leave your device. There is no server-side calculation, no form submission and no logging of the values you enter. You can verify this by opening your browser developer tools and watching the network tab while you use any calculator.
Which calculator should I use first?
The position size calculator. It answers the question that has the largest effect on long-term results, how much to buy, and it is the one most traders skip. Entry and exit decisions matter far less than sizing decisions over a large number of trades.
Do the calculators work for forex, futures and crypto?
The underlying arithmetic is identical across markets: risk budget divided by risk per unit. For stocks the answer is in shares. For crypto it is a fractional coin quantity. For forex you would convert the result into lots using pip value, and for futures into contracts using tick value.