Position Sizing for Prop Evaluations

Position sizing is the single most important skill for passing a prop evaluation. Yet most traders treat it as an afterthought. This guide gives you a complete framework.

The Golden Rule

Never risk more than 1% of your account on a single trade.

On a $50,000 evaluation account, that's $500 per trade. This isn't conservative — it's mathematical survival.

Calculating Position Size

Here's the formula:

Lot Size = Risk Amount / (Stop Loss in Pips × Pip Value)

Example

• Account: $50,000
• Risk: 1% = $500
• Stop Loss: 20 pips
• Pip Value (EUR/USD): $10 per standard lot

Lot Size = $500 / (20 × $10) = 2.5 standard lots

The Drawdown Math

With a 5% daily drawdown limit, you can afford 5 consecutive losing trades at 1% risk each before hitting your daily limit. That's a realistic buffer.

At 2% risk per trade, you're one bad day away from blowing the account.

Risk Per Trade Tiers

| Tier | Risk % | Best For | |------|--------|----------| | Conservative | 0.5% | New evaluators | | Standard | 1% | Most traders | | Aggressive | 1.5% | Experienced only |

Summary

• Calculate lot size before entering the trade
• Never exceed 1% risk per position
• Reduce size after consecutive losses
• Your stop loss is non-negotiable