Why Position Sizing Matters
A trader with a 50% win rate can be consistently profitable — if they size positions correctly. Conversely, a trader with a 70% win rate can lose their account if position sizes are inconsistent. The math is simple: risk too much on any single trade, and a string of normal losses becomes catastrophic. Risk a fixed 1% per trade, and even 20 consecutive losses only reduce your account by 18%.
Every calculator on this page implements the core formula: Position Size = (Account × Risk%) / Stop Loss Distance. The inputs vary by asset class, but the principle is identical.
How to Use These Calculators
- Choose your calculator based on the asset you are trading.
- Enter your account size — the total equity available for trading.
- Set your risk percentage — start with 1% if you are unsure.
- Enter your entry and stop loss prices — use technical analysis to place your stop, not the calculator output.
- Read your position size — trade exactly that size, no more.
Position Sizing by Asset Class
Stocks: Position size in shares. Dollar risk ÷ (Entry − Stop) = shares to buy.
Forex: Position size in lots. Dollar risk ÷ (Stop in pips × Pip value per lot) = lots.
Crypto: Position size in units. Dollar risk ÷ (Entry − Stop) = units to buy.
Options: Number of contracts. Dollar risk ÷ (Premium × Multiplier) = contracts.
Frequently Asked Questions
What is position sizing in trading?
Position sizing determines how many shares, lots, or contracts to trade on a given setup. It is calculated using your account size, a fixed risk percentage (typically 1–2%), and the distance to your stop loss. Correct position sizing ensures no single losing trade can significantly damage your account.
How do I calculate my position size for a stock trade?
Multiply your account size by your risk percentage to get dollar risk. Then divide dollar risk by the difference between your entry price and stop loss price. For example: $10,000 account × 1% = $100 risk. Entry $50, stop $48 → $2 risk per share. Position size = $100 / $2 = 50 shares.
What is a pip in forex trading?
A pip (percentage in point) is the smallest standardized price movement in a forex pair. For EUR/USD, one pip equals 0.0001. For USD/JPY, one pip equals 0.01. Pip value depends on your lot size — a standard lot (100,000 units) of EUR/USD has a pip value of $10.
What is the difference between a standard, mini, and micro lot?
A standard lot is 100,000 currency units. A mini lot is 10,000 units. A micro lot is 1,000 units. Micro lots let smaller accounts trade forex with precise risk management — a micro lot of EUR/USD has a pip value of $0.10.
What percentage of my account should I risk per trade?
Most professional traders risk between 0.5% and 2% per trade. The 1% rule is the most common starting point. At 1% risk, you need 100 consecutive losing trades to blow your account — a very unlikely scenario that gives you time to diagnose and fix any strategy issues.
What is contract size in forex?
Contract size refers to the number of currency units in one standard lot (100,000 units). The contract size determines how much each pip is worth. Brokers also offer fractional contracts (0.1 lot = mini, 0.01 lot = micro) to let traders size positions precisely.
Can I use these calculators for crypto trading?
Yes. The position size calculator works for any asset. Enter your account size, risk percentage, entry price, and stop loss price. The calculator outputs the number of units (BTC, ETH, etc.) you can trade while keeping risk within your target. For crypto, tighter stop losses often mean larger position sizes in units but the same dollar risk.
How is position sizing different from money management?
Position sizing is one component of money management. Money management also covers diversification, maximum drawdown limits, and portfolio-level risk. Position sizing focuses specifically on how much of a single trade to take based on your stop loss and account equity.