Calculate the correct lot size based on your risk % and stop-loss distance. Pre-loaded for British Pound / US Dollar. Adjust inputs below for instant results.
Pip Size
0.0001
Pip Value (1 lot)
$10.00
Avg Spread
0.5–2.0 pips
Active Session
London, New York
Lots = Risk Amount ÷ (SL Pips × Pip Value per Lot)
Example (GBP/USD): $10,000 acct · 1% risk · 20-pip SL on GBP/USD: $100 ÷ (20 × $10.00) = 0.50 lots
GBP/USD (Cable) is the fourth most traded currency pair globally, known for its high volatility and large intraday swings. It is sensitive to Bank of England decisions, UK inflation data, and political developments including trade policy. Spreads are typically slightly wider than EUR/USD.
Find a broker
Compare brokers with the lowest GBP/USD spreads, best execution and reliable regulation.
1.0% risk — Professional (recommended)
Recommended Lot Size
0.50 lots
50,000 units
Risk amount
$100.00
$/pip per lot
$10.00
Stop loss
20 pips
Position Size by Risk Level
| Risk % | Risk $ | Lot Size |
|---|---|---|
| 0.5% | $50 | 0.25 |
| 1%← current | $100 | 0.50 |
| 2% | $200 | 1.00 |
| 3% | $300 | 1.50 |
Kelly Criterion
Full Kelly
25.0%
Max growth — very risky
½ Kelly (recommended)
12.5%
Standard practice
¼ Kelly (conservative)
6.3%
Smoother equity curve
K% = W − (1−W) ÷ R · where W = win rate, R = avg win ÷ avg loss. Use ½ Kelly — full Kelly causes large drawdowns from variance.
Losing Streak Probability — 55% win rate · 1.0% risk/trade
| Consecutive Losses | Probability | Balance After |
|---|---|---|
| 2 in a row | 20.25% | $9,801.00 |
| 3 in a row | 9.11% | $9,702.99 |
| 4 in a row | 4.10% | $9,605.96 |
| 5 in a row | 1.85% | $9,509.90 |
| 7 in a row | 0.37% | $9,320.65 |
| 10 in a row | 0.03% | $9,043.82 |
Probability = (1 − win rate)^N · Balance assumes fixed % risk with no adjustment between trades.
Risk of Ruin — 55% win rate · 1.5R
| Risk / Trade | Risk of Ruin |
|---|---|
| 0.5% | <0.01% |
| 1%← current | <0.01% |
| 2% | <0.01% |
| 3% | <0.01% |
Edge = W×R−(1−W) = 37.50% · RoR = ((1−edge)/(1+edge))^(100/risk%) · Assumes fixed % risk, no account top-ups.
Portfolio Risk Tracker
Formula: risk amount ÷ (stop loss pips × pip value per lot). Professional traders risk 1–2% per trade.