I watched a guy blow $8,000 on one gold trade. Gone. He had no clue about lot sizes. Thought he was trading 0.1 lots. Nope — 1.0 lot. Eight months of savings. Minutes to lose it all.
Position sizing? Most overlooked thing in trading. Seriously. You can have the best strategy in the world — get the size wrong and you're done. Done. Here's how I handle lot sizes for XAUUSD on MT4. Simple stuff.
Gold Lot Sizes — The Basics
| Lot Type | Units | Pip Value (XAUUSD) |
|---|---|---|
| 1.00 (Standard) | 100 oz | ~$10 per pip |
| 0.10 (Mini) | 10 oz | ~$1 per pip |
| 0.01 (Micro) | 1 oz | ~$0.10 per pip |
Pip values shift a bit by broker. Always double-check in MT4. Don't trust me blindly.
My Formula
Same one every time. No exceptions:
Position Size = (Account Balance × Risk %) / (Stop Loss in Pips × Pip Value)
Example — $5,000 account:
- Risk: 2% = $100
- Stop loss: 500 points (based on ATR)
- Pip value for 0.01 lot: $0.10
- Max position: $100 / (500 × $0.10) = 2 micro lots (0.02 lots)
Tiny, right? That's the whole point. Most beginners see 0.02 lots and think "why bother?" Sound familiar? The point is survival. With 0.02 lots and 2% risk, I can be wrong 20 times straight and still have money. The guy risking 0.10 lots (10% per trade) on the same setup? Wiped out in 4 losses. Four.
My MT4 Shortcut
Look, I keep a notes file. Pre-calculated sizes for my most common account balances. Takes the math out of the moment:
| Account | 2% Risk | Stop 200 pts | Stop 500 pts |
|---|---|---|---|
| $2,000 | $40 | 0.02 lots | 0.01 lots |
| $5,000 | $100 | 0.05 lots | 0.02 lots |
| $10,000 | $200 | 0.10 lots | 0.04 lots |
| $25,000 | $500 | 0.25 lots | 0.10 lots |
| $50,000 | $1,000 | 0.50 lots | 0.20 lots |
I check this before every trade. Every single one. Lets me focus on the setup instead of doing math mid-heartbeat.
Common Mistakes I See
Mistake 1: Same lot size every trade. Here's the thing — if your stop is 200 points one day and 500 the next, the size has to change. Keeps dollar risk constant. Simple math.
Mistake 2: Getting bigger after wins. Winning streaks mess with your head. I don't increase my risk percentage based on recent results. 2% is 2%. Up 10% or down 10% — doesn't matter. Know what I mean?
Mistake 3: "I'll just move my stop if it gets close." No. Just no. Your stop is your max risk. Moving it mid-trade is breaking the plan. If you can't handle the stop distance, reduce size — don't shrink the stop. Don't do it.
The Golden Rule
Honestly? Your position size isn't about how much you want to make. It's about how much you're willing to lose. Calculate from the loss first. If the resulting size feels too small, your account is too small — not your position size.
— Lin