EA recommendation 11: Thoughts on lot calculation and risk management, considering effective leverage and risk per trade from a developer's perspective

Good morning, everyone. This is Renmi.

This is the 11th article. In the previous one (⑩), I wrote about how to handle when an EA suddenly starts losing. In the discussion about “the criteria for stopping or waiting,” there was talk that “raising the lot too much causes the maximum drawdown to jump,” but this time I’ll dig a little deeper into that lot calculation.

Here is the previous article.

https://www.gogojungle.co.jp/finance/navi/articles/117640

You may have wondered, “What is the appropriate lot, after all?” This time, I’ll share my own thinking.

Why Lot Calculation Is Important

The lot is the most important parameter that decides how much risk you take in a single trade.

If the lot is too large, a few consecutive losses can deal a big blow to your account. On the other hand, if it’s too small, profits will be minimal. This balance determines the stability of EA operation.

textbook risk management guidelines

A commonly used metric in lot management isEffective Leverage.

Effective leverage = total position value ÷ margin

For example, with a margin of 1,000,000 yen and holding a one-lot (100,000 currency) USD/JPY position, the total position value is about 15,000,000 yen (assuming 1 USD = 150 JPY). The effective leverage is 15x.

GenerallyEffective leverage 1–3x,and the maximum loss per trade is within 1–2% of the marginas a guideline.

With an EA that uses a 20-pip stop and a margin of 1,000,000 yen with 1% risk, you can calculate the appropriate lot as follows.

Lot = (1,000,000 × 0.01) ÷ (20 × 1,000) = 0.5 lot

Using such numbers as a standard reveals the basis for choosing a lot.

But in the end, what matters is “whether you can tolerate it”

That’s the main topic from here.

The percentage guidelines are justa starting pointand not absolute rules.

The essence of risk management is deciding whether you can endure losses when they occur.

Even if you lose 5% of your margin on one trade, if that amount is mentally and financially tolerable for you, there’s no problem. Conversely, even 1% per the textbook is an issue if that amount affects your life.

Absolute amounts may be more important than percentage figures in many situations.

First decide how much you can lose at most, and then work backward to determine the lot. This is also a valid approach to risk management.

Think in GTX Numbers

As an example, let’s look at the GTX numbers I’m selling.

If you operate with 0.01 lots, the maximum loss per trade isabout 1,100 yen, and the maximum drawdown isabout 5,000 yen.

Whether this number is “tolerable” varies greatly from person to person.

Some people don’t mind a balance drop of around 5,000 yen, while for others it causes significant stress. In the latter case, it’s more suitable to increase the margin and tighten the lot, or to choose a different EA.

What matters is not whether GTX risk is high or low, but whether it is a number you can tolerate for yourself.

• GTX Real Trade performance https://real-trade.tech/accounts/52392

• GTX sales page https://www.gogojungle.co.jp/systemtrade/fx/34527

Summary

• Effective leverage 1–3x, 1 trade 1–2% is only a guideline. Not an absolute rule

• The essence of risk management is “whether you can endure that loss”

• It is also important to think in absolute amounts, not just percentages

• Decide your acceptable range first, then work back to determine the lot

Don’t just aim for “somehow 0.1 lot.” Manage risk according to the criteria you set. That alone can considerably improve the stability of EA operation.

Well then, see you next time!

Renmi’s EA List

https://www.gogojungle.co.jp/users/189446/products