Free Tool
Position Size Calculator Pro
Calculate the right number of shares to risk — protecting your capital with every trade using professional position sizing methods.
Account Details
$
%
Professional traders risk 1–2% per trade
Trade Setup
$
$
$
Recommended Position Size
Dollar Risk
—
Position Value
—
% of Account
—
Risk per Share
Risk / Reward Analysis
Risk
—
Reward
—
R:R Ratio
—
Verdict
—
—
Trade Scenario Visualizer
Fixed Dollar Risk
$
The exact dollar amount you are willing to lose
$
$
$
$
Position Size
Max Loss
—
Max Gain
—
Position Value
—
Risk of Account
—
Risk / Reward
R:R Ratio—
Verdict—
Max Loss vs Max Gain
Trade Statistics
%
% of trades that are profitable
R
Average win ÷ average loss
Account Details
$
%
Half-Kelly (50%) is recommended for safety
$
Full Kelly
—
of account
Half Kelly Recommended
—
of account
Custom Kelly
—
of account
Dollar Risk (Half-K)
—
Shares (Half-K)
Expected Value
—
Edge
—
Kelly % vs Risk Level
Account & Risk
$
%
Volatility (ATR)
$
$
14-day ATR from your charting platform
×
Stop = Entry − (ATR × Multiplier). Common: 1.5–2.5×
ATR-Based Position Size
ATR Stop Distance
—
Stop-loss Price
—
Dollar Risk
—
Position Value
—
Position Size at Different Multipliers
Enter values to see comparison
Track combined risk across multiple open positions and see total portfolio exposure.
$
Ticker
Entry ($)
Stop ($)
Shares
Risk $
$
$
—
$
$
—
$
$
—
Total Portfolio Risk
—
— of account
Positions Open
—
Largest Risk
—
Total Exposure
—
Portfolio Risk Level
—
Risk Distribution by Position
What each tab calculates
01
Basic
Risk a fixed % of your account. Enter account size, risk %, entry and stop-loss to get the exact number of shares.
02
Fixed Risk
Specify an exact dollar amount to risk per trade regardless of account size — ideal for beginners and fixed-income traders.
03
Kelly Criterion
Mathematically optimal position sizing based on your win rate and average win/loss ratio. Half-Kelly recommended.
04
ATR-Based
Volatility-adjusted position sizing using Average True Range. Adapts your stop distance to current market volatility.
05
Portfolio Risk
Track total risk across all open positions. See combined exposure and risk concentration at a glance.