Position Sizing
Mastery
The exact formula that turns risk management from theory into practice. After this lesson, you'll calculate position size in your sleep.
First — Why This Matters
Baking Without Measuring
Imagine making a cake by throwing in "some flour, some sugar, some eggs" without measuring. Sometimes it works. Most of the time? Disaster. Trading without position sizing is the same gamble.
Position sizing is your measuring cup. It tells you exactly how much to trade based on your account, your risk tolerance, and how far away your stop loss is. Get the proportions right and your account grows steadily. Get them wrong and one bad trade ruins the whole recipe.
Real scenario: You have a $3,000 account and want to buy gold (XAUUSD). Without position sizing, you open 1.0 lots because it "feels right". A $10 move against you = $1,000 loss (33% of your account gone in minutes). With position sizing: 1% risk = $30 max loss, 0.03 lots. Same trade, same stop — but you survive.
01 — Why This Matters
The Bridge Between Knowledge and Survival
You know you should only risk 1-2% per trade. Great. But how do you actually figure out how much to buy or sell? That's what position sizing answers. It's the formula that turns "risk 1%" into an actual number you type into your trading platform.
💡 Think of it like medication dosage: A doctor doesn't just say "take some paracetamol." They prescribe an EXACT amount based on your weight. Too little = doesn't work. Too much = dangerous. Position sizing is your trading dosage — calculated precisely for YOUR account.
Two traders can take the exact same trade. One calculated their size = risks 1% and sleeps well. The other guessed = risks 8% and wakes up to a margin call. Same trade. Opposite outcomes. The only difference is the maths.
The Wrong Way (Guessing)
"I'll just trade 0.5 lots because that feels about right." This is like prescribing medicine by gut feeling. Sometimes you'll be fine. Other times you'll overdose your account. Never guess your lot size.
The Right Way (The Formula)
Start with your account balance → decide your risk % → calculate the dollar amount you can lose → divide by your stop loss distance → that gives you your exact lot size. It takes 10 seconds and saves your account.
02 — The Formula
Watch It Step by Step
Each variable lights up in sequence. By the end, you'll know exactly how a $5,000 account with a 25-pip stop becomes 0.20 lots.
Tap ▶ Auto Play to see the formula come alive, step by step.
03 — Lot Sizes
Micro, Mini & Standard
In forex, position sizes are measured in "lots". The lot size determines how much each pip of movement is worth in your account currency.
Pro Tip: Most beginners should trade micro lots (0.01-0.09). There's no shame in small sizes — the goal is correct sizing, not big sizing.
04 — Calculator
Multi-Asset Position Sizer
The same principle works across all markets — only the units change. Toggle between Forex, Crypto, and Stocks.
05 — Mistakes to Avoid
Where Traders Go Wrong
"I always trade 0.5 lots"
Lot size should change with EVERY trade based on stop distance
A fixed lot size means your risk changes with every trade. A 20-pip stop at 0.5 lots risks $100, but a 50-pip stop risks $250. Your risk should be fixed, not your lot size.
"I'll figure out the stop after choosing my lot size"
Always determine stop loss FIRST, then calculate lot size
The chart tells you where to place your stop (at an invalidation level). If you pick lots first, you'll set your stop where the math works — not where the market says it should be.
"This setup is perfect, I'll risk 5% instead of 1%"
Every trade gets the same risk percentage, no exceptions
You can NEVER know which trade will win. The "perfect" setup can lose. The mediocre one can win. Consistent sizing lets probability work in your favour over time.
"Micro lots are for beginners, I want to trade big"
Your account size determines your lot size, not your ego
A $2,000 account trading 1.0 lots is reckless (risking $10/pip). The same account trading 0.02 lots is professional (risking $0.20/pip with a 100-pip stop = 1% risk).
06 — Size That Trade!
10-Round Speed Challenge
You'll get a random scenario each round. Calculate the correct lot size and type your answer. Aim for 8/10 or better.
Scenario
What lot size should you trade?
07 — Final Assessment
Position Sizing Quiz
6 questions mixing theory and real calculations. Pass this and you've truly mastered position sizing.
Question 1 of 6
The position sizing formula is:
Question 2 of 6
$20,000 account, 1% risk, 40-pip stop. What's the lot size?
Question 3 of 6
What is a micro lot?
Question 4 of 6
You should determine your stop loss distance based on:
Question 5 of 6
Your account is $1,000 and you want to risk 2%. Your stop is 50 pips. What lot size?
Question 6 of 6
Why is it dangerous to decide lot size BEFORE your stop loss?
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Score 66%+ to unlock your Pro Certificate
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Level 1 — Foundations Complete!
You've completed all 6 Foundations lessons. You understand trading, markets, candlesticks, charts, risk management, and position sizing. You're ready for Level 2: Technical Analysis.
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