Understanding Forex Lot Size

If you're eager to dive into the exciting world of forex trading but feel bogged down by all the unfamiliar terms, you're not alone. This article will simplify one of the key concepts in forex: lot size, an important factor that can greatly influence your trading outcomes. By understanding lot sizes, you'll be better equipped to manage risk and refine your money management strategy. Read on to learn more about forex lot sizes and how to choose the right one to suit your trading needs.

Get Started

Earn Cashback on Your FX Trades

Open an account in as little as 5 minutes. Spreads as low as 0.0, trade and manage your positions from a full suite of mobile and tablet apps.

Get Started

Disclosure: CFDs are complex instruments and come with a high risk of losing money rapidly due to leverage. 74% to 76% of retail investor accounts lose money when trading CFDs with this provider. You should consider whether you understand how CFDs work, and whether you can afford to take the high risk of losing your money. The products and services available to you at FOREX.com will depend on your location and on which of its regulated entities holds your account

Show More

What is a Lot in Forex?

In forex trading, a lot refers to a standardized unit of measurement for the transaction size of a particular currency pair. Lot size is generally expressed in terms of the quantity of the units of base currency traded against the quote currency. For example, if you buy or sell one standard lot of the EUR/USD currency pair, you will be buying or selling 100,000 euros versus the U.S. dollar. 

Since trading the different lot sizes involves taking different levels of risk, you can select an optimal lot size to reflect your personal risk tolerance when trading forex. Also, one online forex broker may support different lot sizes than another broker, so make sure that any forex broker and the particular account type you want to use will allow trading in the specific lot size you prefer. 

Types of Lots

Four main types of lots commonly exist when trading through online forex brokers that are distinguished by the amount of base currency they involve. Lot sizes also reflect the risk involved in trading them since each lot size represents a specific base currency amount. Here's a breakdown of each lot size.

• Standard lot: Represents 100,000 units of the base currency. With a standard lot, even small changes in the exchange rate can result in significant profits or losses.
• Mini lot: Involves trading 10,000 units of the base currency. Mini lots offer more flexibility compared to standard lots while still allowing for substantial gains.
• Micro lot: Consists of 1,000 units of the base currency. This lot size is often ideal for newer forex traders who want to keep their risk exposure low when testing new trading strategies in a live trading account.
• Nano lot: Represents just 100 units of the base currency. Nano lots provide the lowest possible risk exposure, making them helpful for those just starting out as forex traders and those testing strategies. This lot size can also be used by experienced forex traders who prefer to size their trading positions more precisely based on the rules in their trading plan. 

Lot Size Overview

The following table provides an overview of the four main lot sizes supported by many online forex brokers.

Importance of Lots in Forex

Choosing the right lot size can play a critical role in managing your forex trading risk and maximizing your profit potential as a trader. Selecting a lot size that is too large could lead to excessive losses while choosing too small a lot size can reduce your potential gains from a winning position.

The appropriate lot size to select depends on various factors, so take some time to decide on the right lot size for your forex trading strategies. Taking these factors into account when selecting a lot size to use can help improve your trading strategy, thereby increasing your chances of success and keeping risks tolerable. Let's take a closer look at each possible factor in your trading lot size decision.

• Total account balance: Avoid putting too much of your account balance at risk on one trade, since doing so exposes you to bigger losses if things go wrong. Select the right lot size to use given your account balance and decide ahead of time what percent of your trading account you want to put at risk for every trade. This will help you improve your chances of staying in the forex trading business over the long term. 
• Risk tolerance: Everyone has unique feelings about taking risks with their money. If you enjoy rollercoaster rides, you might feel comfortable taking high-risk trades that offer big payoffs. On the other hand, if you prefer stability, you can opt for safer forex trading bets that grow steadily over time. Choose your ideal lot size by taking your personal risk tolerance and preferences into account.
• Stop-loss placement: Protect yourself from major losses by setting up stop-loss orders. These automatic instructions tell your broker to close a trade once it reaches a certain exchange rate level, thereby preventing further damage to your account. Make sure your stop losses fit your budget and risk tolerance.
• Trading goals: Before you put your money at risk in the forex market, take some time to define what you hope to achieve through forex trading — whether it's fast cash, regular income, or slow and steady account growth. Different goals can mean accepting different levels of risk as a forex trading. Set your lot sizes appropriately depending on why you want to trade forex.
• Brokerage choice: Not every online forex broker supports every possible lot size, so select a broker that does offer the lot size you want to use or pick a lot size that is supported by your preferred broker. 
• Market volatility: Currency pairs experience fluctuating exchange rate shifts. Pay attention to past volatility levels and present and future events that could affect the exchange rate of any currency pairs you wish to trade. Think about reducing your lot size when the forex market becomes too volatile to protect your trading account.
• Trade duration: In general, shorter-term trades can involve larger lot sizes because the chance of a large adverse market move is typically smaller than if you take longer-term positions. This means you can tailor your lot size choice based on your planned trade holding period.

Considering these factors can help you select the best lot size for your forex trading strategy. Remember, finding the right balance between taking advantage of potential trading gains and defense lays the groundwork for a trading plan that prepares you for unexpected market moves while supporting your account’s growth.

How to Calculate Lot Size in Forex

To calculate lot size for a forex position, you can follow these steps:

• Risk amount: Select a maximum loss amount based on your trading account balance, stop-loss level and risk appetite.
• Express risk in base currency terms: Convert that risk amount into the base currency of the currency pair you intend to trade. 
• Compute pip value: Calculate the pip value for the currency pair of interest by determining how much each pip is worth in terms of the pair’s base currency.
• Calculate position size: Divide your risk amount by the stop-loss distance expressed in pips and the pip value to determine the ideal position size in base currency terms. 
• Determine the most suitable lot size:  Look at the order of magnitude of the position size computed in step 4 to see which lot size suits best. If the position size is expressed in:
• Hundreds of thousands or more: Use standard lots
• Tens of thousands: Use mini lots
• Thousands: Use micro lots
• Hundreds: Use nano lots 

Example

For example, suppose you only want to be exposed to a maximum loss of $100 per trade when trading the GBP/JPY currency pair from the long side in which GBP is the base currency. The current GBP/JPY exchange rate is 197, your stop-loss level on the long position is set at 195 and the current GBP/USD exchange rate is 1.2500.

You first convert your preferred maximum loss of $100 into British pounds using the following formula:

Risk amount in USD/ GBP/USD Exchange Rate = Risk amount in GBP

Here is that maximum loss calculation with the values filled in: 

$100 / 1.2500 = 80 GBP

Next, you compute the pip value for the GBP/JPY currency pair. To do this, you divide one pip (in this pair this is 0.01) by the present exchange rate of the currency pair as follows.

Pip value = 0.01/Current GBP/JPY exchange rate

Here is that pip value calculation with the values filled in: 

0.01 / 197.00 = 0.0000508 GBP

You can now use the following equation to determine the appropriate position size amount given your stop-loss level of 195.00 which is 200 pips away from the prevailing spot rate of 197.00.  

Position Size = (Risk Amount / (Stop Loss in pips * Pip Value))

Here is that position size calculation with the values filled in: 

80 GBP /(200*0.0000508) = 7,874 GBP position size

Finally, you can review the position size to see what order of magnitude it consists of. In this case, it is expressed in thousands of GBP, which means a micro lot size that is also expressed in thousands would be most appropriate for this trade. 

Accordingly, rounding this 7,874 GBP ideal position size number up to the nearest thousand gives a trade amount of 8,000 GBP, which would be 8 micro lots of 1,000 GBP each. You can now comfortably enter a buy order of 8 micro lots in GBP/JPY at 197 with a stop loss at 195 knowing that your risk tolerance has been suitably taken into account. 

What Are Standard Lots in Forex?

Standard lots represent the largest available lot size at most online forex brokers, and they consist of 100,000 units of the base currency. Trading in standard lots involves taking a considerable amount of financial risk, but they do offer several advantages for experienced traders seeking higher potential returns and improved risk management, although they also come with some drawbacks.

Advantages of Standard Lots

Trading in standard lots offers several benefits for traders who can afford to use them, including:

• Achieve higher potential returns for high-conviction trades by using larger trade sizes.
• Take advantage of the more competitive pricing available for larger trades, which typically means tighter dealing spreads and reduced commissions.

Disadvantages of Standard Lots

Despite their advantages, downsides exist with trading standard-size lots that you should take into account when considering trading in that large lot size:

• Higher margin requirements for standard lots may restrict traders with smaller margin accounts from accessing this lot size at all.
• The inflexibility of using a large lot size often makes them unsuitable for short-term trading strategies where quick adjustments of only a partial position are necessary to scale into and out of positions.
• Smaller stop-loss distances from trade entry points are typically required to maintain reasonable risk levels.

Choosing Your Ideal Lot Size Matters

Selecting the right lot size is considered vital for successful forex trading, and lot size selection is a key component in forex risk management. Sizing your positions according to the amount of capital in your trading account helps manage your risk and protect your account in case a position goes against you. 

Whether you eventually decide to choose standard, mini, micro or nano lots to trade in, make sure you understand the implications of each choice regarding your potential profits, risks and overall trading strategy performance. Also keep in mind that proper advance planning, discipline and education are key components of most profitable trading strategies.

Frequently Asked Questions