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Calculate Lot Size in Trading — Step-by-Step Guide & Transcript

How to Calculate Lot Size in Trading (Stop Being a Novice)

0h 01m video Published Feb 28, 2026 Transcribed Aug 10, 2026 Matias Maderna Matias Maderna
Beginner 1 min read For: Novice forex traders looking to understand position sizing and risk management.
AI Trust Score 65/100
⚠️ Average / Some Fluff

"Delivers a clear, practical method for lot size calculation, though the 'novice' framing is a bit dramatic for the simple content."

AI Summary

This video teaches novice traders how to calculate the correct lot size for their trading positions, emphasizing that asking about lot size reveals inexperience. The presenter demonstrates a practical method using a position sizing tool, showing how to input account balance, stop loss level, and risk percentage to determine the exact lot size needed to limit losses to a desired percentage of capital.

[00:00]
Identifying Novice Traders

Asking what lot size to use in a trading account is a sign of being a novice. The video aims to teach proper lot size calculation to avoid appearing and being a beginner.

[00:12]
Using the Position Tool

When entering a trade, use the position tool. Set the entry point, the stop loss level (where you will exit if the trade goes wrong), and the target objective. Double-click the tool to open the menu.

[00:25]
Inputting Account Balance

In the menu, enter your account balance. For example, if you have $2,000, input 2000. For EUR/USD, the lot size is 100,000 units; otherwise, you may need to look it up (e.g., using ChatGPT).

[00:38]
Setting Risk Percentage

Enter the risk percentage of your capital you are willing to lose on this trade at the stop loss. For example, if you want to risk 1%, input 1%.

[00:52]
Adjusting Precision and Calculating

Set the quantity precision (decimal places) — recommended to leave at 3. Click accept, and the tool will show the exact lot size needed so that at the stop loss, you lose only the specified percentage (e.g., 1%) of your account.

The key takeaway is that lot size should be calculated based on your account balance, stop loss distance, and risk percentage, not guessed. Using the position tool automates this calculation, ensuring consistent risk management and preventing novice mistakes.

Mentioned in this Video

Tutorial Checklist

1 00:12 Open the position tool in your trading platform and set your entry, stop loss, and target levels.
2 00:25 Enter your account balance (e.g., 2000 for $2,000).
3 00:25 Confirm the lot size for the currency pair (e.g., 100,000 for EUR/USD) or look it up.
4 00:38 Enter the risk percentage you are willing to lose at the stop loss (e.g., 1%).
5 00:52 Set quantity precision to 3 decimals and click accept to see the recommended lot size.

Study Flashcards (5)

What does asking about lot size indicate about a trader?

easy Click to reveal answer

It indicates they are a novice.

What is the lot size for EUR/USD?

easy Click to reveal answer

100,000 units.

00:25

What three inputs are required in the position tool to calculate lot size?

medium Click to reveal answer

Account balance, risk percentage, and stop loss level.

00:25

What is the recommended precision (decimal places) for quantity?

easy Click to reveal answer

3 decimals.

00:52

How does the position tool determine the lot size?

medium Click to reveal answer

It calculates the lot size so that at the stop loss, you lose exactly the specified risk percentage of your account.

00:52

💡 Key Takeaways

💡

Novice Indicator

Establishes the core premise: lot size questions reveal inexperience, setting the stage for the tutorial.

🔧

Account Balance Input

Shows the first concrete step in the calculation, grounding the method in real numbers.

00:25
⚖️

Risk Percentage Setting

Emphasizes risk management as the driver of lot size, a key principle for traders.

00:38
🔧

Automated Calculation

Demonstrates the tool's output, making the process practical and repeatable.

00:52

[00:00] Cuando alguien me pregunta qué lotaje debe utilizar en su cuenta de trading, me demuestra que es realmente un novato. Y es por eso que hoy te voy a enseñar a vos a calcular el lotaje así que dejas de parecer y ser un novato.

[00:12] Cuando vas a meter tu operación en trading vas a utilizar la herramienta de posición. Vas a decir quiero entrar acá, voy a perder acá abajo y voy a ir a buscar mi objetivo por allá arriba. Le vas a dar doble clic a esta herramienta y te va a aparecer este menú.

[00:25] En este menú deberás colocar el número, el balance de tu cuenta. Por ejemplo, tenés 2.000 dólares, pone 2.000 dólares. Si estás operando el euro dólar, el tamaño del lote es 100.000 y si no, te va a tocar buscarlo en ChatGPT.

[00:38] Luego vas a colocar el riesgo de tu capital que vas a estar arriesgando en este stop loss, en la zona que hemos dicho que donde llegamos vamos a perder. Por ejemplo, si vamos a perder en 1%, ponemos 1%. Y abajo de todo dice precisión de cantidad.

[00:52] Acá le vamos a poder poner los decimales. Yo recomiendo que lo dejemos en 3. Le damos a aceptar y acá te va a indicar en cantidad que lotaje debes utilizar en esa operación para que en ese stop loss pierdas el 1% de tu cuenta.

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