Calculate the correct lot size based on your risk % and stop-loss distance. Pre-loaded for British Pound / Japanese Yen. Adjust inputs below for instant results.
Pip Size
0.01
Pip Value (1 lot)
~$6.71
Avg Spread
1.5–3.5 pips
Active Session
Tokyo, London
Lots = Risk Amount ÷ (SL Pips × Pip Value per Lot)
Example (GBP/JPY): $10,000 acct · 1% risk · 20-pip SL on GBP/JPY: $100 ÷ (20 × ~$6.71) = 0.75 lots
GBP/JPY is one of the most volatile major cross pairs, often moving 100–200 pips per day. It combines the high-beta pound with the safe-haven yen, amplifying directional moves. The pair requires wider stops due to its volatility and is popular with experienced traders seeking large moves.
Find the right broker for you
Get matched to brokers for your country, market and style — free, ~30 seconds.
Find a broker
Compare brokers with the lowest GBP/JPY 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.