Forex Position Size Calculator

Here's what kills most trading accounts: random lot sizes. A trader risks 0.5 lots on one trade, 0.2 on another, with no logic behind either choice. Then one bad trade wipes out five winners.

Position sizing fixes that. You pick how much you're willing to lose (say, 1% of your account), measure your stop-loss distance, and the math tells you exactly how many lots to trade. Same risk every time, regardless of where your stop goes.

The Math (It's Actually Simple)

Three things matter: your risk in dollars, how far your stop is, and what each pip costs. That's it.

Lots = Risk Amount ÷ (Stop Distance × Pip Cost)

Say you've got $10,000 and want to risk 1%. That's $100 on the line. Your stop is 40 pips away on EUR/USD, where each pip costs $10 per lot:

$100 ÷ (40 × $10) = 0.25 lots

Tighter stop? You can trade bigger. Wider stop? Trade smaller. The dollar risk stays the same either way.

Using This Calculator

1. Account balance — What you actually have right now, not what you deposited six months ago.
2. Risk percentage — 1-2% is standard. Go higher and you're gambling, not trading.
3. Stop-loss in pips — Measure from your entry to your stop. A 30-pip stop isn't the same as a 100-pip stop.
4. The result — That's your lot size. Type it into MT4/MT5 exactly as shown.

Do this before every trade. Your lot size changes based on where you're putting your stop.