Most beginners use 0.10 lots on every trade regardless of their account balance — because that’s what the tutorial used. A trader with $1,000 using 0.10 lots risks $10 per pip. A trader with $100,000 using 0.10 lots risks $10 per pip. The position is identical in dollar terms, but represents 1% of the small account and 0.01% of the large one. One is appropriate. The other is leaving 99% of the available edge on the table.
Position size must scale with your account balance.
The Core Principle: Risk Percentage, Not Fixed Lots
Position sizing should always be expressed as a percentage of your current account balance — never as a fixed lot number.
Dollar Risk = Account Balance × (Risk % ÷ 100)
Stop Loss Pips = |Entry − Stop Loss| ÷ Pip Size
Lot Size = Dollar Risk ÷ (Stop Loss Pips × Pip Value)When your account grows from $10,000 to $20,000, your lot size doubles automatically at the same risk percentage. You don’t need to manually adjust — the formula handles it.
Position Size Reference Table — All Account Sizes
EUR/USD at 1% risk, 50-pip stop loss (pip value = $10 per standard lot):
| Account Balance | 0.5% Risk ($) | Lot Size (0.5%) | 1% Risk ($) | Lot Size (1%) | 2% Risk ($) | Lot Size (2%) |
|---|---|---|---|---|---|---|
| $500 | $2.50 | 0.005 lots | $5.00 | 0.01 lots | $10.00 | 0.02 lots |
| $1,000 | $5.00 | 0.01 lots | $10.00 | 0.02 lots | $20.00 | 0.04 lots |
| $5,000 | $25.00 | 0.05 lots | $50.00 | 0.10 lots | $100.00 | 0.20 lots |
| $10,000 | $50.00 | 0.10 lots | $100.00 | 0.20 lots | $200.00 | 0.40 lots |
| $25,000 | $125.00 | 0.25 lots | $250.00 | 0.50 lots | $500.00 | 1.00 lot |
| $50,000 | $250.00 | 0.50 lots | $500.00 | 1.00 lot | $1,000.00 | 2.00 lots |
| $100,000 | $500.00 | 1.00 lot | $1,000.00 | 2.00 lots | $2,000.00 | 4.00 lots |
| $200,000 | $1,000.00 | 2.00 lots | $2,000.00 | 4.00 lots | $4,000.00 | 8.00 lots |
Small Account Sizing ($500 – $5,000)
The primary challenge with small accounts is that even micro lots may represent a higher-than-acceptable risk percentage depending on the stop distance.
$1,000 account, 1% risk ($10), 30-pip stop:
- Lot Size = $10 ÷ (30 × $10) = 0.033 lots → round to 0.03 lots
$1,000 account, 1% risk ($10), 100-pip stop:
- Lot Size = $10 ÷ (100 × $10) = 0.01 lots (minimum micro lot)
If the calculated lot size falls below your broker’s minimum (typically 0.01 lots), you have two options:
- Skip the trade — the risk math doesn’t allow it at your account size
- Use a broker with nano lot support (0.001 lots minimum)
Instruments to prioritize with small accounts: EUR/USD, GBP/USD (tight spreads, $10/pip on standard lot, micro lots available).
Medium Account Sizing ($10,000 – $50,000)
At this level, you have enough flexibility to trade most instruments with proper sizing. Gold (XAUUSD) and NAS100 become practical at this account tier.
$25,000 account, 0.5% risk ($125), 80-pip stop on XAUUSD:
Dollar Risk = $25,000 × 0.5% = $125
Stop Loss Pips = 80 pips
Pip Value = $10 per standard lot
Lot Size = $125 ÷ (80 × $10) = 0.16 lots$25,000 account, 0.5% risk ($125), 150-point stop on NAS100:
Dollar Risk = $125
Pip/Point Value = $1 per standard lot
Lot Size = $125 ÷ (150 × $1) = 0.83 lotsLarge Account Sizing ($100,000+) and Funded Accounts
At $100,000 and above — including funded prop firm accounts — the standard drops to 0.5% maximum per trade. This is not conservatism; it’s the mathematical requirement for surviving 20+ trade losing streaks within a 10% drawdown limit.
$100,000 funded account, 0.5% risk ($500), 100-pip stop on EUR/USD:
Lot Size = $500 ÷ (100 × $10) = 0.50 lots$100,000 funded account, 0.5% risk ($500), 100-pip stop on XAUUSD:
Lot Size = $500 ÷ (100 × $10) = 0.50 lotsFor funded traders, the TRADE90 funded account calculator enforces the 0.5% per-trade cap and tracks daily risk budget automatically.
The Scaling Principle: Balance Doubles, Lot Size Doubles
When your account grows, your lot size should increase proportionally — not your risk percentage.
| Growth Stage | Account | 1% Risk | Lot Size (50-pip stop, EUR/USD) |
|---|---|---|---|
| Starting | $5,000 | $50 | 0.10 lots |
| First milestone | $10,000 | $100 | 0.20 lots |
| Intermediate | $25,000 | $250 | 0.50 lots |
| Established | $50,000 | $500 | 1.00 lot |
| Professional | $100,000 | $1,000 | 2.00 lots |
The lot size doubled with each account doubling. The risk percentage stayed at 1% throughout.
Common Mistakes When Scaling
Mistake 1: Keeping the same lot size as the account grows Effective risk % drops as balance grows. A trader using 0.10 lots on a $50,000 account is risking 0.1% per trade — half the intended risk, unnecessarily limiting growth.
Mistake 2: Increasing risk % instead of lot size when trying to grow faster Doubling your risk % from 1% to 2% to “grow faster” doubles your expected loss on each losing trade. It also doubles the chance of account-ending drawdowns. Double the lot size at the same 1% — not the percentage.
Mistake 3: Not recalculating after significant drawdown If your account drops from $25,000 to $22,000 after a losing streak, your lot sizes must be recalculated based on $22,000 — not the original $25,000. Continuing to size as if you have $25,000 is a hidden form of oversizing.
When to Recalculate Your Position Size
Recalculate on every trade using your current balance. The TRADE90 position size calculator runs the calculation in seconds — enter your current balance each session, not a fixed number from when you opened the account.
Triggers for recalculation:
- Any meaningful change in account balance (after each closed trade)
- After a week of no trading (to capture any overnight swaps or adjustments)
- After transitioning to a funded account at a new capital level
- After a significant drawdown that reduces available margin
Position Sizing by Account Size — Gold and NAS100 Reference
| Account | 0.5% Risk | XAUUSD (100-pip stop) | NAS100 (100-point stop) |
|---|---|---|---|
| $10,000 | $50 | 0.05 lots | 0.50 lots |
| $25,000 | $125 | 0.13 lots | 1.25 lots |
| $50,000 | $250 | 0.25 lots | 2.50 lots |
| $100,000 | $500 | 0.50 lots | 5.00 lots |
| $200,000 | $1,000 | 1.00 lot | 10.00 lots |
Frequently Asked Questions
What lot size is good for a $1,000 account? At 1% risk ($10) with a 50-pip stop on EUR/USD: 0.02 lots. Start with micro lots (0.01) and size up only as your balance grows.
What lot size for a $10,000 account? At 1% risk ($100) with a 50-pip stop on EUR/USD: 0.20 lots. At 0.5% risk ($50): 0.10 lots.
Does lot size change as my account grows? Yes — it should. Position size must be recalculated on every trade based on your current balance. As your balance grows, your lot size grows proportionally at the same risk percentage.
What position size for a $100,000 funded account? At 0.5% risk ($500) with a 100-pip stop on EUR/USD: 0.50 lots. The TRADE90 funded account calculator handles this automatically.
Can I use the same lot size for every trade? No. Stop loss distance varies by setup. A 30-pip stop requires a larger lot than a 100-pip stop at the same risk percentage. Always calculate fresh for each trade.