Lot size = (account balance × risk %) ÷ (stop-loss distance in pips × pip value per lot). Decide how much you're willing to lose on the trade, measure the distance from entry to the signal's stop-loss, then size the position so that stop-out costs exactly that amount. Never copy a signal provider's lot size, because it was built for their account, not yours.
The step-by-step calculation
- Set your risk amount. Balance × risk percentage. For example, 1,000 × 1% = 10 in account currency. See how much to risk per trade for guidance on choosing the percentage.
- Find the stop distance in pips. Entry price minus stop-loss price, converted to pips.
- Find the pip value. For a standard lot (100,000 units) on pairs quoted in USD, such as EUR/USD, a pip is about 10 USD. For JPY pairs and crosses it differs, and it depends on your account currency. Check your broker's calculator.
- Divide. Lots = risk amount ÷ (stop pips × pip value per lot).
Worked example
Account: 1,000 USD. Risk: 1% = 10 USD. A EUR/USD signal has a 25-pip stop. Pip value is roughly 10 USD per standard lot.
10 ÷ (25 × 10) = 0.04 lots, which is 4 micro lots (4,000 units). Each pip then moves about 0.40 USD, so a full stop-out costs about 10 USD.
| Lot type | Units | Approx. pip value (USD-quoted pair) |
|---|---|---|
| Standard (1.00) | 100,000 | 10 USD |
| Mini (0.10) | 10,000 | 1 USD |
| Micro (0.01) | 1,000 | 0.10 USD |
Recommended for youForex Risk Management and Position Sizing for Signal TradersCommon mistakes
- Using a fixed lot size for every signal. A 10-pip stop and a 60-pip stop need very different sizes.
- Ignoring spread and slippage. Fast markets, such as news releases, can fill you away from the stop, so actual loss may exceed your plan.
- Rounding up. If your broker's minimum lot forces more risk than you intended, skip the trade or reduce risk. That's a common issue with small accounts.
- Stacking correlated trades. Three USD-based signals at 1% each can behave like one 3% bet.
Position sizing limits losses; it doesn't make a signal profitable. Leverage magnifies losses, and forex isn't suitable for money you can't afford to lose. Consider speaking with a licensed financial adviser if you're unsure.
If you're comparing signal services, check whether they publish stop-loss levels with every signal, since you can't size a trade without one. Confirm current details on the provider's official site.
Related
- Forex Risk Management and Position Sizing for Signal Traders
- What is a good risk-reward ratio for forex signals?
- Strategies, Risk and Sessions for Signal Traders
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