Trading
Position size calculator.
Risk amount is the account times the percent you choose. Size is that amount divided by the gap between entry and stop. Fill in a take-profit if you want the R-multiple.
Account and prices
Enter account, risk, entry and stop, then calculate.
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- Cash at risk
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- Position value
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- Of the account
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- Stop distance
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- R-multiple
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A stop above entry is treated as a short. Size is in units of the instrument (shares, coins, contracts) — round down if your venue only fills whole shares. Fees, slippage and gaps are not modelled. Not financial advice.
The formula.
- Enter the account size.
- Choose the percent one losing trade may cost — often 0.5% to 2%.
- Entry and stop: the absolute difference is the risk per unit. Size is the risk budget divided by that difference.
- Optional take-profit: the calculator reports the R-multiple and the dollar reward at that size.
Games and the backtester.
Questions, answered.
How do I calculate position size?
Risk amount = account × (risk percent / 100). Risk per unit = |entry − stop|. Position size = risk amount / risk per unit. A long uses a stop below entry; a short uses a stop above it.
What is the 1% rule?
A common starting point is to keep one losing trade to about 1% of the account. You can type any percent here.
What is an R-multiple?
R is the dollars you chose to risk on the trade. A 2R target is twice that distance beyond entry, so a win of 2R pays two times a 1R loss.
Is this financial advice?
No. See the Terms. The numbers come from what you typed. Fees, slippage and gaps are not modelled. Paper-trade in CryptoSim or CandleDirect.