How to Calculate Lot Size for Stocks
BY Created by TIOmarkets
|mayo 14, 2025Understanding how to calculate lot size for stocks trading may seem confusing for beginner traders, but it’s a critical aspect of risk management that can not be overlooked.
Your lot size directly impacts how much you could potentially profit or lose on a trade and this can affect the overall performance of your trading strategy. So in this article, we'll explore how to calculate the lot size for stocks, including the tick values, to help you trade responsibly.
Continue reading to learn more about the essential concepts and learn how to minimize trade execution mistakes.
How to calculate lot size for stocks
There are various methods to determine the lot size when trading stocks. Some traders refer to the average true range (ATR) to gauge price volatility, while others calculate the distance between their entry price and stop loss. Based on either of these measurements, they adjust their lot size according to their risk tolerance.
Regardless of the method you choose, grasping the concept of lot size for stocks trading and how it relates to the value of a tick is crucial for managing risk. The knowledge contained in this article is essential to ensure you select the appropriate volume or lot size before executing any trade.
What is the lot size for stocks?
The lot size for stocks is the number of shares you will be buying or selling.
- One standard lot (1.0 lots) represents 100 shares of stock.
- One mini lot (0.1 lots) represents one tenth of a lot, or 10 shares of stock.
- One micro lot (0.01 lots) represents one hundredth of a standard lot or 1 share of stock.
Lot sizes for stocks trading and their tick values
| Contract size | MT4 / MT5 volume | Number of shares | Tick value (USD) |
| Standard lot | 1.0 | 100 | 0.01 = $1.00 |
| Mini lot | 0.10 | 10 | 0.01 = $0.10 |
| Micro lot | 0.01 | 1 | 0.01 = $0.01 |
The tick value for stocks is denominated in the stocks quote currency. For stocks where the price is denominated in a currency other than your account base currency, the tick value will require additional conversion based on the relevant exchange rates.
The lot size calculation for stocks can vary
The lot sizes outlined above are standard for stocks traded on TIOmarkets platform. The number of shares traded per lot may vary between brokers and platforms.
Understanding the contract specification for stocks trading
The specific details of how to calculate the lot sizes mentioned above can be found in the contract specification. Here’s how you can find it inside the MT4 or MT5 trading platform.
- Right-click on any symbol in the market watch window.
- Select “Specification” from the pop-up menu that appears.
An example is included below and the highlighted rows are particularly important for understanding and calculating the lot size for stocks.
Coca Cola (KO) contract specification
As you can see from the contract specification above, the contract size for Coca Cola (KO) stock is 100 shares per standard lot. Which means that whenever you select 1.0 lots in the volume field on the MT4 or MT5 trading platform, you will be buying or selling 100 shares.
Further down the contract specification sheet, you will see the minimum volume, maximum volume and volume step information. The first two are self explanatory, they inform you what the minimum and maximum lot sizes are. In this case, the minimum volume is 0.01 lots, which is 1/100th of a standard lot (1.0). If 1.0 lots is equal to 100 shares, then a volume of 0.01 is 1 share. The maximum lot size for stocks on TIOmarkets trading platform is 10 lots or 1,000 shares.
The volume step tells you the minimum increment or decrement you can enter on the trading platform. In this example, you can buy or sell in step increments of 0.01 lots or in other words, you can buy or sell from 0.01 lots, 0.02 lots, 0.03 lots, and so on up to the maximum volume or lot size.
How the lot size for stocks trading affects tick values
As you have come to learn so far, the lot size for stocks trading is the term used to describe the number of shares that you are trading. The lot size is directly related to, and has a significant effect on the tick value. Which in turn, affects how much money you can potentially make or lose in the stock market.
As a rule, the smaller the lot size, the smaller the tick value is and vice versa. As a result, your risk and profit potential will be less compared to when you are trading larger lot sizes or a higher quantity of shares.
How to calculate lot size for stocks trading
When you begin trading stocks, one of the most vital steps is determining how much you're willing to risk per trade. Understanding how to calculate lot size for stocks trading helps you align your trade volume with your risk tolerance. So if you are stopped out, you do not lose more than you initially intended. (Not taking slippage into account)
Let’s suppose you're prepared to risk $100 on a trade and you have decided that your stop loss will be placed 100 ticks away from your entry price. Using the formula below, you can easily calculate what the lot size should be to stay within your predefined risk tolerance.
Stocks lot size calculation formula
Lot Size = Risk amount in USD / Stop loss in ticks
Lot size = $100 / 100 ticks
Lot size = $1 per tick
Lot size = 1 standard lot (1.0 lots or 100 shares)
Let’s consider another example:
Imagine the Coca Cola stock is trading at $70 per share, and you’re willing to risk up to $500 on a long trade. You have also determined that your stop loss should be placed 1000 ticks away at $60.
To calculate the lot size, first find the tick value that you should be trading by dividing the amount to risk by the distance of your stop loss in ticks.
Lot Size = Risk amount in USD / Stop loss in ticks
Lot size = $500 / 1000 ticks
Lot size = $0.50 per tick
Lot size = 5 mini lots (0.50 lots or 50 shares)
It is as simple as that.
Why lot size is so important for stocks trading
The reason why you should know how to calculate lot size for stocks trading, is because it directly affects how much you could potentially profit or lose on a trade. The higher your risk tolerance and amount to risk, the higher your lot size can be. Conversely, the lower your risk tolerance and amount to risk, the lower your lot size should be.
Lot sizes for stocks trading can vary, so when trading stocks, you first need to know how many shares are in one standard lot and the corresponding tick value. This information is available on the contract specifications sheet inside the MT4 and MT5 trading platform. When you know this, calculating what lot size you should be trading for stocks will be straightforward.
FAQ’s
Why is calculating lot size for stocks so important?
Calculating lot size for stocks trading is crucial for effective risk management, as it determines the potential profit or loss on the trade. By calculating the lot size you should be trading based on your risk tolerance, you can control your exposure and limit the losses on any single trade.
Can I change my lot size after placing a trade?
You cannot change the lot size of an open trade on a hedging account, but you may be able to on a netting account. If you wish to adjust your lot size once the trade has been executed, you will need to close the current trade or open new ones to achieve the desired lot size.
What happens if I use too large of a lot size?
Using too large of a lot size relative to your account balance can significantly increase your potential to profit, as well as significantly increasing the risk of loss.
Does the lot size affect the spread or commissions I pay?
The lot size does not directly affect the spread unless the volume is large enough to absorb the available liquidity in the market. The lot size does affect the commission you will pay and this is charged pro rata, per round turn lot. So the higher the lot size traded, the higher the commission will be.
How do I know what my maximum lot size should be?
Your maximum lot size should be determined by your risk tolerance and the size of your account balance. The trading community suggests risking a small percentage of your account balance on any single trade idea (e.g. 1-3%). You should calculate the lot size that aligns with your risk tolerance and the distance you intend to place your stop-loss from your entry price.
Are the lot sizes the same for all stocks?
Standard, mini and micro lot sizes are common for most stocks, but they can vary. You should check the contract specification for the symbol you are trading to confirm the standard lot size.
Is there a difference between volume and lot size?
On the MT4 or MT5 trading platform, the volume field represents the lot size. A volume of 1.0 means 1 standard lot, 0.1 means 1 mini lot and 0.01 means 1 micro lot. Volume and lot size are interchangeable terms that represent the quantity being bought or sold.
Where can I find the contract specifications for each stock?
You can find the contract specifications for each stock in the MT4 or MT5 trading platform. Right-click on the stocks ticker symbol in the Market Watch window and select "Specification" from the menu. This will provide details about the standard contract size, minimum and maximum trading volumes, and other relevant trading information.
Learn how to calculate lot size in other markets
- How to calculate lot size for commodities
- How to calculate lot size in forex
- How to calculate lot size for indices
- How to calculate lot size in crypto
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