Position Sizing: How Much Should I Trade?
Ever clicked Buy and then realised you had no idea how many lots you just opened?
Let’s fix that! Position sizing is your seat-belt-it keeps risk at a comfortable level so one bad trade
never wipes you out.
The 1-Line Formula
Risk per trade (in $) divided by stop-loss pips × pip value tells you how many lots to trade.
Position size = (Account × Risk%) ÷ (Stop-loss pips × Pip value)Keep risk ≤ 2 % of your account (many pros cap at 1 %).
Example Setup
- Account equity: $10 000
- Risk per trade: 1 % ($100)
- Pair:
EUR/USD - Stop-loss: 25 pips
- Pip value (std lot): $10
Calculation
Lots = 100 $ ÷ (25 pips × 10 $/pip)
= 0.40 lotsSo you’d open 0.4 standard lots (40 k units) to keep risk at $100.
Quick-Look Table (EUR/USD, 10 $ per pip)
| Account | Risk % | Stop pips | Lots |
|---|---|---|---|
| $5 000 | 1 % | 30 | 0.17 |
| $10 000 | 2 % | 50 | 0.40 |
| $25 000 | 1 % | 20 | 1.25 |
Assumes pip value = $10 (standard lot) – adjust for minis/micros.
3 Sneaky Pitfalls to Avoid
- Flat lot size every trade (risk changes when stop size changes).
- Ignoring pair differences – pip value on GBP/JPY ≠ EUR/USD.
- Re-entering bigger after a loser (“revenge sizing”).
Remember: Size slowly grows with account equity. Nail consistency first, then compounding does the heavy lifting. 📈