The method
How it is worked out
Shares = (account × risk % − fees) ÷ |entry − stop|
- risk per share
- Distance from entry to stop
Position Size Calculator
Size a trade from your account, the risk you'll accept and your stop-loss, so a wrong call costs only what you planned. The result updates as you type so you can compare scenarios quickly.
Keep in mind
What it leaves out
- GapsA stop does not guarantee the exit price in a fast market.
- CorrelationSeveral positions in one sector share the same risk.
- Fractional sharesSome brokers allow fractions; this rounds down to whole shares.
Use the calculator to compare scenarios rather than as a guaranteed forecast.
About the Position Size Calculator
Size a trade from your account, the share of it you are willing to lose and your stop-loss level, so that a wrong call costs only what you planned, and check the reward-to-risk before you place it.
How it works and an example to tryShow less
How to use the result
The amount at risk is the account times the risk percentage. Risk per share is the distance from entry to stop. Shares are the risk amount, less fees, divided by risk per share, rounded down. Reward is the distance to target times shares; the ratio compares the two.
Example to try
A £25,000 account risking 1% (£250) on a share bought at £48.50 with a stop at £45.20 allows 72 shares, a £3,492 position. A £56 target gives £530 of potential gain: 2.1 to 1.
Put it to work
Try it on a real situation
Load an example
What moves the result most
Worked out from your figures above. Tap a row to try it.
Who uses it, and when
Active investors and traders in shares, ETFs or crypto, and anyone who has lost more than intended because the position was too big.
Mistakes worth avoiding
- Sizing by how confident you feel rather than by the stop distance.
- Moving the stop after entry, which changes the risk you calculated.
- Holding several correlated positions each sized as if independent.
Questions
What does the Position Size Calculator do?
Size a trade from your account, the risk you'll accept and your stop-loss, so a wrong call costs only what you planned.
How should I use the result?
The amount at risk is the account times the risk percentage. Risk per share is the distance from entry to stop. Shares are the risk amount, less fees, divided by risk per share, rounded down. Reward is the distance to target times shares; the ratio compares the two.
Does TechBullion store the information I enter?
The core calculation or transformation runs in your browser. Normal website security and analytics may still record page-level events, but the tool does not need to create a public record from your inputs.
What mistakes do people make with a position size calculator?
Sizing by how confident you feel rather than by the stop distance. Moving the stop after entry, which changes the risk you calculated. Holding several correlated positions each sized as if independent.
Is the result guaranteed?
No. Use the result as a practical check or planning aid and verify important decisions with the relevant primary source, provider or professional advice.
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Results are estimates based on the figures entered, for general information only, and not financial, investment, tax or legal advice. See our terms of use.