Position size calculator
How many shares can you buy so that a stop-out costs exactly what you decided to risk? Enter four numbers.
- Position value
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- Share of the account
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- Money at risk
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- Distance to the stop
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- Reward if the target is hit
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- Reward to risk
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How it is calculated
- Money at risk = account size × risk per trade.
- Risk per share = the distance between the entry and the stop.
- Shares = money at risk ÷ risk per share, rounded down.
- Reward to risk = (target − entry) ÷ (entry − stop): 3R means the target pays three times what the stop costs.
Then keep the score
TradeJournal records the planned risk of every trade, shows the result in R and your open risk across the account, so you see whether you really stick to your size.
No card needed to start. Then CHF 5 a month or CHF 50 a year, cancel any time.
Everything a trading journal should do
Brokers sync by themselves
Interactive Brokers and Trading 212 sync automatically, eToro with its API keys; Charles Schwab, Robinhood, Webull, TradeStation, DEGIRO and more on PRO; Swissquote, Saxo and any broker from a file.
Replay every trade
Watch the chart rebuild candle by candle around your entry and exit, with VWAP, moving averages and MACD.
Setups and entry tactics
Tag what the trade was and how you entered it. The playbook shows which ones actually pay you.
Positions with adds and trims
Buys and sells of one position are grouped into one line with its timeline, valued by average cost like the IBKR app.
Size and risk before you click
The position size calculator and your open risk across the account, in one place.
Market screener
US stocks by theme, 52-week highs and lows, new highs of the day and MACD crosses, refreshed during the session.
One plan, everything included
Launch price until 31 October 2026. 7 days free, no card needed to start.
Questions
What risk per trade should I use?
Many traders risk between 0.25% and 1% of the account per trade, so that a losing streak stays survivable. It is your decision: the calculator only does the arithmetic.
Does it work for options?
It sizes in shares. For options, the money at risk is the premium you can lose, divided by the loss per contract.
Is anything saved or sent?
No. The calculation runs in your browser; nothing is stored or sent.
Position size calculator
No card needed to start. Then CHF 5 a month or CHF 50 a year, cancel any time.