Free to use
Trading Calculators
Every calculator runs in your browser. Nothing you type is sent anywhere, stored or logged, and there's 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
What a trade cost you and what it made.
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What did this trade net?
Stock Profit Calculator
What a trade actually netted after commissions, in dollars, percent and R. Works for 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's the size of the positions and how consistent the risk was.
That's why these calculators deal with the arithmetic of risk. The questions they answer, how many shares, is this worth the risk and what did that cost me, are the ones that compound into results over hundreds of trades.
If you're 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's no sign-up, no account, no email and no usage limit. Every calculator runs entirely in your browser in JavaScript, which is also why they respond instantly and keep working offline once the page has loaded.
Is my data stored or sent anywhere?
No. The numbers you type never leave your device. Everything is calculated locally, nothing is submitted and nothing is logged. You can check that for yourself 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 with the biggest effect on your long-term results, which is how much to buy, and it's the one most traders skip. Over a few hundred trades, sizing decisions swamp entry and exit decisions.
Do the calculators work for forex, futures and crypto?
The underlying arithmetic is the same everywhere: risk budget divided by risk per unit. For stocks that gives you shares. For crypto it's a fractional coin quantity. For forex you'd convert into lots using pip value, and for futures into contracts using tick value.