Position Size Calculator
Size a stock position from account risk percent and the distance between entry and stop—floored to whole shares in this simple model.
Your Inputs
Most traders risk 1-2% per trade
Shares to Buy
50
Position Value
$7,500.00
Dollar Risk$250.00
Risk Per Share$5.00
Max Potential Loss$250.00
% of Account30.00%
Large Position Warning
This position is 30.00% of your account. Consider reducing your position size.
Commonly asked Position Size questions
What formula does this use?
Dollar risk = account × risk% ; per-share risk = |entry − stop| ; shares = floor(dollar risk / per-share risk).
What if my stop is above entry (shorts)?
The math uses absolute distance—interpret entry/stop for your direction; this UI is framed for long stock.
What risk % should I use?
Many traders start near 0.5–2% of account equity per trade; your comfort and strategy should drive the number.
Does this guarantee max loss?
No—gaps, halts, and slippage can exceed the stop distance; sizing is a planning tool, not a hard limit.
Options position sizing?
Use contract multipliers and portfolio margin rules; this calculator is share-based for stock.
Why whole shares?
We floor shares so the result is a practical whole-share count; fractional shares may differ at your broker.
Related Calculators
Daily Cumulative P&L
$33,989.51+$32,609.07
Avg Trade: $60.80
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Best Performing
Morning Breakouts
82% Win Rate
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