Market Context
Risk Model Inputs
Stop style
Based on strategy invalidation level
Live Result
Position Size
0
Shares
Expected loss
0
Risk / share
0
Resolved stop
0
R-multiple
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Smart Verdict
Incomplete Setup
Complete required fields to calculate position size.
Field alerts
Invalid account size · Invalid entry price
This tool estimates risk budget only. Results depend on your inputs and system parameters. Not investment advice. Markets involve risk.
Recent Snapshots
Saved risk budget snapshots appear here. Load one to reuse its parameters.
No budget snapshots yet. Save once to see recent records here.
Position Sizing Method
Calculate how many shares to buy from risk per trade, not conviction.
A stock position size calculator turns a trading idea into a risk budget. Start with account size and risk per trade, define entry and stop loss, then convert that risk into shares, expected loss, position value, and R multiple.
Risk per trade
Decide the account amount you are willing to lose if the stop is hit. This is the budget, not a forecast.
Risk per share
Subtract stop loss from entry price. A wider stop means fewer shares under the same risk budget.
Shares and R multiple
Review share count, expected loss, position value, and risk-reward ratio before the idea becomes an order.
Common questions
- How many shares should I buy?
- Divide your risk budget by risk per share, then floor the result so the planned loss stays inside the account limit.
- Is this a stop loss calculator?
- It uses your stop loss to calculate stock position size. It does not choose the perfect stop or guarantee a result.
Learn the workflow
- What Is a Position Size Calculator?
position size calculator basics
- Calculate Stock Position Size Before You Trade
stock position size and shares to buy
- Risk Per Share vs. Risk Per Trade
risk per share and risk per trade
- Stop Loss Position Size Calculator
stop loss position sizing