Edge Ratio

What Is Edge Ratio?

Edge ratio is your mathematical advantage per trade. It measures whether your average win multiplied by your win rate is larger than your average loss multiplied by your loss rate.

An edge ratio above 1.0 means you have positive mathematical expectancy — your strategy should be profitable over time.

An edge ratio below 1.0 means the math is against you — no matter how disciplined you are, the strategy loses money over large sample sizes.

The Formula

Edge Ratio = (Average Win × Win Rate) / (Average Loss × Loss Rate)

Example Calculation

Your trading data from 100 trades:

• Average win: $400
• Average loss: $300
• Win rate: 50%
• Loss rate: 50%

Edge Ratio = ($400 × 0.50) / ($300 × 0.50) = $200 / $150 = 1.33

You have an edge ratio of 1.33, meaning you have a 33% mathematical advantage per trade.

Another Example

Your trading data:

• Average win: $300
• Average loss: $250
• Win rate: 45%
• Loss rate: 55%

Edge Ratio = ($300 × 0.45) / ($250 × 0.55) = $135 / $137.50 = 0.98

You have an edge ratio of 0.98, meaning your strategy is mathematically unprofitable. Despite a respectable-sounding 45% win rate, the math does not work.

Why Edge Ratio Matters

Many traders focus on win rate and ignore edge ratio. This is a fatal mistake.

Strategy A: 60% win rate, edge ratio 0.95

• Result: Unprofitable despite high win rate

Strategy B: 40% win rate, edge ratio 1.40

• Result: Profitable despite low win rate

Strategy B will make money. Strategy A will lose money. Win rate alone is misleading.

Edge ratio reveals the mathematical truth.

The Margin of Safety

An edge ratio of 1.0 means break-even mathematically. But in reality, you have slippage, commissions, and over-trading costs.

A realistic margin of safety is edge ratio of 1.15+.

Why?

• Slippage costs: 2-5% of expected profit
• Commissions: 1-3% of expected profit
• Overtrading mistakes: 5-10% reduction in edge

An edge ratio of 1.15 has 15% buffer for these costs. An edge ratio of 1.05 has only 5% buffer — likely not enough.

Edge Ratio by Strategy

Different strategies have different natural edge ratios.

Scalping (tight targets):

• High win rate (60-70%), small average win
• Result: Edge ratio often 0.9-1.1 (marginal)

Swing trading (wider targets):

• Moderate win rate (45-55%), larger average win
• Result: Edge ratio often 1.2-1.5 (solid)

Position trading (very wide targets):

• Lower win rate (30-40%), very large average win
• Result: Edge ratio often 1.5-2.0+ (strong)

This is why swing and position trading are easier than scalping — they naturally produce better edge ratios.

How to Improve Your Edge Ratio

Edge ratio has four inputs. Improving any increases your edge.

1. Increase Average Win (holding longer, wider targets)

If you increase average win from $300 to $400:

• Edge ratio goes from 1.20 to 1.60
• 33% improvement

2. Increase Win Rate (better entry quality, confluence)

If you increase win rate from 45% to 55%:

• Edge ratio goes from 1.20 to 1.40
• 17% improvement

3. Decrease Average Loss (tighter stops, faster exits)

If you decrease average loss from $300 to $200:

• Edge ratio goes from 1.20 to 1.80
• 50% improvement

4. Decrease Loss Rate (fewer bad trades, better selectivity)

If you decrease loss rate from 55% to 45%:

• Edge ratio goes from 1.20 to 1.60
• 33% improvement

Most traders focus on increasing average win. But often, decreasing average loss produces better results faster.

Monitoring Edge Ratio Monthly

Your edge ratio should stay consistent month-to-month.

If your edge ratio is 1.30 in January but 0.95 in February, something changed.

Possible causes:

• Market conditions shifted (less volatility, more chop)
• Your discipline broke (taking bad trades, over-leveraging)
• Sample size was small (low trade count, normal variance)

Professional traders monitor edge ratio like vital signs. Dropping edge is a signal to review trades, not to trade harder.

Edge Ratio in Poor Market Conditions

Some market conditions naturally reduce edge.

During consolidation, ranging markets, or low-volatility periods:

• Average wins shrink (fewer big moves)
• Loss rate increases (more chop)
• Edge ratio drops

A trader with edge ratio 1.40 in trending markets might have only 1.05 in ranging markets.

Smart traders reduce size or stop trading during low-edge periods.

The Bottom Line on Edge Ratio

Edge ratio is the mathematical heart of trading. Without positive edge ratio, no amount of discipline saves you.

Calculate it. Monitor it monthly. If it drops below 1.15, adjust your strategy (higher conviction entries, wider targets, tighter stops, smaller position sizes).

With solid edge ratio (1.20+) and disciplined execution, profitability is inevitable.

Track your edge ratio in PipJournal. Calculate it monthly. If it drops, investigate: did your win rate fall? Did average loss increase? Identify the problem and fix it. Maintain 1.15+ edge ratio and consistent profits follow. Start tracking.