What Is Lot Size in Forex? Lots, Pip Value & Position Size Explained
What is lot size in forex? A forex lot is a standardized way of expressing the size of a currency position. For common retail forex trades, 1.00 lot is equal to 100,000 units of the base currency, 0.10 lots equals 10,000 units, and 0.01 lot equals 1,000 units. However, the lot sizes you can trade may differ between brokers and instruments.
Why does lot size matter? The lot size has an impact on the size of your market exposure, the amount of money a price move is worth, the margin requirement, and the profit or loss of a position. This guide explains how lot size, pip value, leverage, margin, and position sizing relate to one another when evaluating a forex position.
Key Takeaways
A lot is a unit used to express the size of a forex position.
Under common retail practices, 1.00 lot = 100,000 units of the base currency.
0.10 lot = 10,000 units, which is generally referred to as a mini lot.
0.01 lot = 1,000 units (1K), usually called a micro lot.
A larger position typically means a larger monetary impact from the same price move.
Pip value is not always $10, $1, or $0.10. Instead, it depends on the combination of the currency pair, trade size, exchange rate, and your account currency.
Minimum volume, maximum volume, and volume steps may differ from broker to broker and across different instruments.
What Is Lot Size in Forex?
A forex lot size refers to the amount of currency represented by a position. It explains the size of your position in a currency. For example, in the case of the currency pair EUR/USD, EUR is the base currency, and USD is the counter (or quote) currency.
Under this common retail currency convention, 1 lot = 100,000 base units. For example:
1.00 lot of EUR/USD = 100,000 EUR
0.10 lot of EUR/USD = 10,000 EUR
0.01 lot of EUR/USD = 1,000 EUR
This does not necessarily mean that 1.00 lot is equal to $100,000. This simply refers to the number of units in the base currency, not the dollar value. For example, if EUR/USD is 1.1000, a 1.00-lot, 100,000-EUR position has a notional value in USD of around $110,000. This value moves with the exchange rate.
This difference is especially relevant when comparing lot size, margin, and leverage. Using leverage, a trader can control a position with a notional value that exceeds the amount of cash set aside to serve as margin.
Forex Lot Sizes at a Glance
The table below lists some of the most common retail forex lot conventions:
Lot Type | Platform Volume | Base-Currency Units | Example on EUR/USD |
Standard lot | 1.00 | 100,000 | €100,000 |
Mini lot | 0.10 | 10,000 | €10,000 |
Micro lot | 0.01 | 1,000 | €1,000 |
Nano lot | 0.001 | 100 | €100 |
Nano lots are not available to everyone. The minimum volume, maximum volume, and volume-step specifications are dictated by the broker, instrument, and symbol. While these labels are helpful abbreviations, they should not be assumed to be universally applicable to all instruments.
Trading platforms may express order volume differently depending on the instrument. Always check the symbol’s contract size, minimum volume, maximum volume, and volume step before assuming that a displayed value represents the same exposure across different products.
MetaTrader 5 displays symbol-specific information such as minimum volume, maximum volume, and volume step.
What Does 1 Lot Mean in Forex?
Many traders often say that 1 lot forex refers to 1.00 standard lot, which is typically equivalent to 100,000 units of the base currency. For example:
EUR/USD: 1.00 lot = 100,000 EUR
GBP/USD: 1.00 lot = 100,000 GBP
USD/JPY: 1.00 lot = 100,000 USD
You will observe that the currency represented by the 100,000 units varies according to the currency used as the base currency. Hence, the statement "1 lot equals $100,000" isn't quite right. It can only refer to the dollar amount as a base-currency amount when USD is the base currency.
The dollar value of the position in the quote currency will be determined by the exchange rate. If the EUR/USD rate is 1.1000, then 100,000 EUR has a notional value of close to $110,000.
How Much Is 1 Lot in Forex?
The typical forex lot size is 100,000 units of the base currency. Its value in your account currency will depend on the trading instrument, the exchange rate, and the currency of your account.
This is an important nuance because position size is related to, but different from, notional value.
What Does 0.1 Lot Mean?
For example, 0.10 lot is generally known as a mini lot, or 10,000 base-currency units. For instance, when you are holding a 0.10-lot EUR/USD position, you are trading 10,000 EUR. The 0.10-lot size represents only one-tenth of the base-currency units of the 1.00-lot size.
As a result, its pip value, given all other variables remaining constant, will typically be one-tenth of the pip value of the 1.00-lot size. In EUR/USD, if the example position you have is 1.00 lot at $10 per pip under the applicable account and pricing conditions, then the 0.10-lot position is equivalent to $1 per pip.
This is a hypothetical forex lot size calculation. Pip value depends on the currency pair, the current exchange rate, the size of the position traded, and the account currency.
What Does 0.01 Lot Mean?
0.01 lot is typically a micro lot, or 1,000 units of the base currency. For example:
1.00 lot = 100,000 units
0.10 lot = 10,000 units
0.01 lot = 1,000 units
Under the same illustrative EUR/USD assumptions, a 1.00-lot position has a pip value of about $10.00. A 0.01-lot position would therefore have an approximate pip value of $0.10. The second thing to note is that, again, not every pair or account has a pip value of $0.10. The $0.10 is based on a number of market and account assumptions.
Standard vs Mini vs Micro vs Nano Lot
The primary distinction among common lot types is the quantity of base-currency units they comprise. These categories are not meant to be rigid guidelines as to which lot size is suitable for whom.
A bigger or smaller lot size is not necessarily better, safer, or more usable. An appropriate position size depends on factors such as account equity, stop-loss distance, instrument characteristics, pip or tick value, trading costs, margin requirements, and the trader’s predefined risk limit.
Standard Lot
The lot size for 1 standard lot is usually 1.00, and the number of units of the base currency is 100,000.
Mini Lot
A mini lot is usually 0.10 lot or 10,000 base units.
Micro Lot
A micro lot is generally 0.01 lot (or 1,000 units of the base currency).
Nano Lot
A nano lot usually refers to 0.001 lot or 100 units of the base currency where the broker or product offers it.
How Does Lot Size Affect Pip Value?
Lot size and pip value are related. A pip is the standard unit of measurement of price movement for a forex currency pair. The same amount of movement can be worth very different amounts depending on the size of the position. As an example, consider EUR/USD where USD is the quote and account currency:
Position Size | Approx. Pip Value |
1.00 lot | $10 per pip |
0.10 lot | $1 per pip |
0.01 lot | $0.10 per pip |
Sample figures for EUR/USD in a typical scenario where pip value is quoted in USD. Actual pip value will depend on the currency pair, the current exchange rate, the size of the position, and the account currency.
In other words, if the position size increases while everything else remains unchanged, the monetary impact of each pip increases proportionally. For a 10-pip price movement, the same illustrative pip values would translate into:
1.00 lot = approximately $100
0.10 lot = approximately $10
0.01 lot = approximately $1
Applying the same rule in both directions, a positive move can increase unrealized profit, while a negative move can increase unrealized loss.
What Is a Pip in Forex Trading?
Position Size vs Lot Size vs Trade Volume
To clarify what lot size is, the amount that a position represents is called the lot size. Position size is the size of the position you are opening or holding. Trade volume can be the term used in platform language to define the amount of an instrument you want to trade.
For example, in MetaTrader 5, the volume of an order may be set to a specific number, such as 1.00, 0.10, or 0.01. The available volume may not always be the same for each symbol. In MetaTrader 5 documentation, for example, you can find Minimum Volume, Maximum Volume, and Volume Step for a particular symbol.
So, having 0.01 on your trading platform does not mean that the instrument can always be traded at that volume. The symbol's trading specifications specify which volumes you can place an order for.
Lot Size vs Leverage vs Margin
Margin is different from leverage and lot size. Lot size, leverage, and margin are related through position exposure, but they describe different concepts.The amount of capital required depends not only on the size of the position (exposure) but also on how much leverage is applied.
It is common to express a position in terms of lot size, which gives the exposure, and leverage. Margin is the amount of capital required under the applicable margin rules. Therefore, the presence of sufficient available margin to establish a position does not by itself make the size of the position suitable for a given risk limit.
Because position size, leverage, margin, and trading costs all affect capital requirements, understanding how much money you need to start trading requires more than checking a broker’s minimum deposit.
Lot Size
Lot size simply refers to the size of your position. A bigger lot results in a greater number of units of the underlying currency according to the applied contract convention.
Leverage
Leverage is the relationship between position size and the capital needed to support that size of position under the relevant trading terms. Leverage does not alter the value of a standard lot. Under the standard retail forex convention, a standard lot is 100,000 units of the base currency.
What Is Leverage in Forex Trading?
Margin
Initial margin is the amount of capital required to support a position under the applicable margin requirements. Margin requirements may vary according to the instrument, the size of the position, leverage, specific account conditions, and other trading terms.
How to Calculate Lot Size in Forex
There's more to determining a position size than just assessing your margin or account balance. A practical calculation can follow these steps.
Step 1: Find the Account Equity or Balance
Begin with the account value that is being used to make the calculation. For instance, an account has equity of $1,000.
Step 2: Define an Illustrative Risk Limit
If you're testing a position-sizing formula, you can use a hypothetical risk amount. For example, if the hypothetical risk limit is 1%: $1,000 × 1% = $10
Of course, the $10 is simply an example. Position sizing should be considered as part of a broader risk management process rather than as a standalone calculation.
Step 3: Determine the Stop-Loss Distance
Suppose we take the hypothetical stop-loss as 50 pips.
Step 4: Find the Pip Value for a Standard Lot
For this hypothetical EUR/USD example, assume a pip value of approximately $10 per pip for a 1.00-lot position in a USD-denominated account.
Step 5: Calculate the Position Size
The simplified formula is:
Position Size (lots) = Risk Amount ÷ (Stop-Loss Distance in Pips × Pip Value per 1 Lot)
This simplified formula assumes that the pip value per 1.00 lot has already been expressed in the account currency. For cross-currency pairs or accounts denominated in another currency, an additional currency conversion may be required.
The pip value per 1 lot depends on the instrument you are trading. For example, for common forex instruments, 1 lot equals 100,000 units of the currency. Using the hypothetical figures:
$10 ÷ (50 × $10) = 0.02 lots
Therefore, using these hypothetical assumptions, the calculated position size would be 0.02 lots. This is an illustrative example of mathematics, not a recommendation to risk 1% of your account or use a 50-pip stop.
In live trading, the pip value needs to be calculated based on the account and instrument in question, and the resulting volume needs to be checked against the broker's minimum volume and volume-step requirements.
How Lot Size Changes Potential Profit and Loss
Price movement in dollars is affected by lot size. Consider the same illustrative EUR/USD assumptions:
1.00 lot = $10 per pip
0.10 lot = $1 per pip
0.01 lot = $0.10 per pip
Using the same illustrative assumptions, a 10-pip favorable move would produce approximately:
1.00 lot = approximately +$100
0.10 lot = approximately +$10
0.01 lot = approximately +$1
On the other hand, if the market moves 10 pips away from the position, unrealized P&L would be about:
1.00 lot = -$100
0.10 lot = -$10
0.01 lot = -$1
These figures are before applicable trading costs and are also based on the same illustrative pip-value assumptions. A larger lot size does not make a trade better; it simply increases the monetary impact of the same price movement.
How Lot Size Affects Trading Costs
The size of the position can also have an impact on the monetary cost of opening and maintaining a position.
Spread
The spread is the difference between the bid price and the ask price. The monetary impact of the spread will generally increase with position size when the spread is quoted in pips, because each pip represents a larger amount of money for a larger position.
Position size can also affect volume-sensitive trading costs, including the amount of overnight swap applied to an eligible position.
Commission
Certain types of account structures may impose a commission based on volume traded (e.g., X amount per lot or per side). If commission is volume-based, larger lot sizes will typically result in larger commission amounts.
The specific commission basis varies according to the account and trading terms. Always check whether the quoted commission is per lot, per side, or round turn, because the charging basis can materially change the total transaction cost.
Swap
Swap or overnight financing can also scale with position size, depending on the symbol’s swap calculation method and the broker’s trading conditions. Depending on the instrument or account conditions, the fee can be measured in points, currency, percentage, or other relevant terms.
Therefore, position size should not be considered in isolation from the costs of opening, holding, and closing the trade.
Lot Size in MetaTrader 5
In MetaTrader 5, the Volume field is used to enter the volume of your trade. For the instrument you are trading, the values may be 1.00, 0.10, or 0.01, according to the applicable trading specifications. For common retail forex conventions:
1.00 = 100,000 base-currency units
0.10 = 10,000 base-currency units
0.01 = 1,000 base-currency units
But these values should not be applied to every symbol. MetaTrader 5 displays symbol-specific trading parameters in the Symbol Specification window, including minimum volume, maximum volume, and volume step.
Minimum volume and its step are constrained by the conditions for the symbol set by the broker. For instance, a symbol may have a minimum step of 0.01, but another product can have different minimum or step requirements.
Don't assume that all instruments have the same lot size; before placing an order, check the corresponding symbol specifications.
Common Lot Size Mistakes
Familiarity with the basic terminology can help you avoid a lot of calculation errors.
Confusing 0.10 With 0.01
These are not the same position size.
0.10 lot = 10,000 units under the usual convention
0.01 lot = 1,000 units
Small differences in volume can translate into large differences in monetary impact on P&L.
Assuming One Lot Always Means $100,000
A standard lot is usually equivalent to 100,000 units of the base currency, though it is not equivalent to that value in dollars. The dollar value will depend on which currency has been selected as the base currency and what the current exchange rate is.
Presuming Each Pip Is Valued at $10
A $10 pip value applies to specific 1.00-lot USD-quoted forex pairs under typical circumstances. It's not a universal rule. Pip value is different for every exchange rate, currency pair, position size, and account currency.
Measuring the Size of a Position Only by Available Margin
Available margin indicates whether a position can be maintained under the relevant margin requirement. It does not, on its own, indicate the monetary loss that would result from a price move. Position sizing needs to be considered separately from the margin that is readily available.
Ignoring Symbol-Specific Volume Requirements
The volume acceptable for one instrument may not be suitable for others. Verify the minimum volume, maximum volume, and volume step for a particular symbol before placing an order. MetaTrader 5 provides these specifications at the symbol level.
How to Check the Minimum Lot Size for an Instrument
The minimum tradable volume is not necessarily the same across brokers, instruments, or symbols. Before placing an order, check the instrument’s contract specifications for:
Minimum Volume
Maximum Volume
Volume Step
Volume Limit, Where Applicable
These values determine which volumes can be submitted for that symbol under the applicable trading conditions. This is especially relevant for small position sizes. Even if a micro lot is quoted as 0.01, you shouldn't assume that all brokers or all products you want to trade will have a minimum of 0.01.
For example, STP Trading currently lists 0.01 lot as its minimum trading lot in its general Forex trading information. Instrument- or account-specific specifications should still be checked before placing an order.
This is a broker-specific trading condition rather than a universal minimum for all forex instruments.
Key Points to Remember About Forex Lot Size
Lot size is the unit used to measure the amount or size of a forex position. Most retail trading scenarios follow the following conventions: 1.00 lot = 100,000, 0.10 lot = 10,000, and 0.01 lot = 1,000.
Your position size determines your exposure and the financial consequence of price movements in the market. As a result, it is closely related to pip value, trading costs, margin requirements, and risk.
The key thing here is that lot size is not leverage, margin, risk, etc. An appropriate forex position size varies according to the instrument, account conditions, stop distance, pip value, and the trader’s predefined risk limit.
Prior to entering into a trade, check that the volume for the instrument is correct and work out the position size based on the pip value and trading conditions. Once you understand how lot size affects exposure, pip value, and risk, the next step is to review the trading conditions that apply to your account and instrument.
You can compare STP Trading's available account types to review the trading conditions that apply to each account type.