What Is Position Sizing and Why Does It Matter?
Position sizing is the process of determining how much of your account balance to risk on any single trade. It is arguably the most important practical skill in trading — more impactful on long-term results than strategy selection, entry timing, or market choice.
The reason is simple: even the best strategy will produce losing streaks. How large your stakes are during those losing streaks determines whether you survive them and can continue trading, or whether they wipe out your account before your edge has time to play out.
The Fixed Percentage Model
The most widely used and recommended position sizing method for retail traders is the fixed percentage model: risk a set percentage of your current account balance on each trade. The standard recommendation for beginners is 1-2%.
The formula: Stake = Account Balance × Risk Percentage
Examples at 2% Risk
- account → .00 maximum stake per trade
- account → .00 maximum stake per trade
- account → .00 maximum stake per trade
- ,000 account → .00 maximum stake per trade
- ,500 account → .00 maximum stake per trade
Why Fixed Percentage Works Better Than Fixed Amount
If you stake a fixed dollar amount (e.g., always per trade), your risk percentage changes as your account grows or shrinks. When your account drops to , a stake is now 5% of your balance — a dangerous level. When it grows to ,000, is just 1% — unnecessarily conservative.
Fixed percentage sizing automatically adjusts: as your account grows, stakes grow proportionally. As your account shrinks during a drawdown, stakes shrink automatically — which slows down losses and preserves capital. This self-regulating quality is what makes it the professional standard.
Drawdown Survival Analysis
One of the most important reasons to use 1-2% risk per trade is survival through normal drawdown periods. Here is how different risk levels perform during a 10-trade losing streak:
| Risk Per Trade | Account After 10 Losses | Account After 20 Losses |
|---|---|---|
| 1% | ~ (of ,000) | ~ |
| 2% | ~ | ~ |
| 5% | ~ | ~ |
| 10% | ~ | ~ |
| 20% | ~ | ~ |
A 10-trade losing streak at 2% risk leaves you with 82% of your account intact — enough runway to recover. At 20% risk, 10 losses leaves you with just 11% — effectively finished.
Setting Your Daily Loss Limit
In addition to per-trade sizing, set a daily loss limit — the maximum total you allow yourself to lose in a single day before stopping. A common guideline is 5-6% of your account.
At 2% stake size, your daily loss limit of 6% = 3 consecutive losses before stopping for the day. This is conservative and intentional. Emotional trading most often escalates after the second or third loss in a session — the daily loss limit stops you before this becomes a spiral.
Recalculating Your Stake
Recalculate your stake at the start of each trading session based on your current account balance. You do not need to recalculate after every single trade, but updating it each session (or whenever your balance changes by more than 10%) keeps your risk consistent.
Create a simple reference table — like the one above — based on your specific account balance and keep it visible during your session so you never have to calculate it under pressure.
The Minimum Stake Reality
On Deriv, the minimum binary option stake is typically /bin/zsh.35-.00 depending on the contract type. If your account is small (under ), your calculated 2% stake may fall below this minimum.
In this case, either:
- Use the minimum stake available (and accept that your effective risk percentage is higher until your account grows)
- Deposit enough to make your 2% stake equal to at least the minimum ( account = .00 at 2%)
Do not be tempted to trade with a larger stake just because you can. The discipline of sizing correctly matters more than the size of any single trade.
Position Sizing in Practice: A Sample Session
Account balance:
Risk per trade (2%): .00
Daily loss limit (6%): .00
Maximum losing trades before stopping: 3
Before opening the platform, write these numbers down. Set your stake to .00. If you lose 3 trades ( total), close the platform for the day. Do not adjust your stake mid-session based on results. Review your journal afterward.
When to Increase Your Stake Size
Only increase your percentage risk after your trading journal demonstrates consistent, profitable results over a meaningful sample size (minimum 100 trades). Even then, increase gradually — move from 1% to 1.5%, then 2%, rather than jumping directly to 5% after a good week.
The goal of position sizing is never to maximise returns on a single trade — it is to ensure you have enough trades to let your edge play out over time.
About the Author
Bretton Gitonga — trading educator and founder of Money8gg. Years of hands-on experience with binary options and forex on Deriv. Contact Bretton.
