Lot Size Calculator
Lot Size Calculator
Use this lot size calculator to get the exact volume for the risk you are willing to take, on currency pairs, metals, indices and crypto. Give it the account balance, the percentage you risk and the stop loss in pips, and it returns the lots to type into the order window, so the position fits the stop instead of the stop being squeezed to fit the position.
What are lots in forex?
In forex, a “Lot” defines the trade size, or the number of currency units to be bought/sold in a trade. One Standard Lot is 100,000 units of the base currency.
Most brokers also allow trading with fractional lot sizes, down to 0.01, sometimes even less. Fractional lot sizes are categorized as mini lots (0.10), micro lots (0.01) and nano lots (0.001). Please refer to the image above to compare the lots and correspondent currency units.
How to use the Position Size and Risk Calculator
Instrument: Traders can select from major forex pairs, minors and exotics, several cryptocurrencies, such as BTC/USD, ETH/USD, LTCUSD, XLM/USD and XRP/USD, and a range of commodities, such as Gold, Silver and Oil. Let’s choose, for our example, the USD/CAD pair.
Deposit currency: The account base currency is important to assess the ideal lot size, as it takes into consideration the pip value and the market rate of the selected cross. We choose USD as our deposit currency, for this example.
Stop-loss (pips): Traders should input the maximum number of pips willing to risk in a trade. For this example we will use 100 pips for our stop-loss.
Account balance: Pretty straightforward, traders just need to input the account equity. For our example, we will type 2000.
Risk: The crucial field of this Position Size and Risk Calculator! In this field traders can select from a risk percentage or any value in the account base currency ($2, $20, $40, etc). As a guideline, professional traders do not risk more than 2% of the account equity per trade. This money management rule allows traders to last longer in their trading careers, and eventually, also to recoup from previously losing trades. So, for our example, we will select 2% risk.
Now, we hit the “Calculate” button.
Reading the lot size calculator results
The results: The Position Size and Risk Calculator uses a market price live feed with the current interbank rate (in a 5-digit format) and it will display the selected currency pair price (in our example the USD/CAD price).
In this case, using a stop-loss of 100 pips and risking 2% of our account equity, the recommended lot size would be 0.05 lot.
Next, the calculator displays the amount of units that the 0.05 lot represent; 5,000 units, and finally the portion of the account equity at risk, or the value of the position, in our case, 40 USD.
You might also find our Drawdown Calculator useful. It can help you to accurately calculate how your trading account equity can be affected after a series of losing trades.
The single formula behind every lot size calculator
Actually, strip away the interface and only one line of arithmetic remains. In short, lots equal the money you risk, divided by the stop distance in pips multiplied by the value of a pip for one lot.
Take, for example, a 5,000 dollar account risking 1 percent, which is 50 dollars, with a 25 pip stop on EUR/USD where one pip per lot is worth 10 dollars. Fifty divided by two hundred and fifty gives 0.20 lots. So that is the whole calculation, and the pip value calculator supplies the only piece that changes between instruments.
Lot size calculator table: the same risk, different stops
Of course, every row risks the same 50 dollars on the same 5,000 dollar account. However, the stop changes on every line.
| Stop loss | Lots on EUR/USD | What it means |
|---|---|---|
| 10 pips | 0.50 | Scalping, and the spread hurts |
| 20 pips | 0.25 | Intraday, still tight |
| 30 pips | 0.17 | Comfortable intraday stop |
| 50 pips | 0.10 | Swing entry on H1 |
| 100 pips | 0.05 | Daily chart position |
| 200 pips | 0.03 | Wide stop, small size |
Above all, look down the middle column and the lesson appears by itself. Indeed, a wider stop is not more dangerous, it simply requires a smaller position. Instead, the danger only arrives when the stop widens and the lots stay where they were.
Why the lot size calculator answer changes with the instrument
For example, gold is the classic trap. One lot of gold is a hundred ounces and a move of 0.01 is worth one dollar, so a 300 point stop with 50 dollars of risk allows roughly 0.16 lots. Traders who carry their EUR/USD habits onto gold usually open ten times too much.
Similarly, yen pairs, indices and crypto all behave differently, because the contract size and the pip value differ. Obviously a volume that felt right yesterday proves nothing today. Consequently, run the numbers for the actual symbol every time rather than trusting a volume that worked yesterday on something else.
Lot size calculator habits that keep accounts alive
- Fix the percentage first. Usually, decide 1 percent, or 0.5 if the account is funded, and never adjust it because a setup looks unusually good.
- Never increase after a loss. Besides, doubling up to recover is the fastest documented route to an empty account, as the risk of ruin calculator shows.
- Respect the minimum. On a small account the smallest allowed lot may already exceed your risk, and the honest answer then is to skip the trade.
- Let the chart set the stop. In other words, place it where the idea is wrong, then let the calculator decide the size.
Finally, an indicator that marks the invalidation level for you, such as Iron Bell, makes that last habit much easier to follow.
Lot size calculator questions traders ask
What is a standard lot? A hundred thousand units of the base currency. Similarly, a mini lot is 0.10, a micro lot is 0.01, and most brokers accept anything in between. Generally the platform shows the volume in lots, not in units.
Should I risk 1 percent or 2 percent? Start at 1. Then move to 2 only after a hundred trades of records, and never on a funded account with a hard drawdown limit.
Does leverage change the lot size? No, because leverage decides the margin, not the risk, and you can confirm that in the margin calculator.
What if the calculator says 0.004 lots? Basically, the account is too small for that stop. Either choose a closer stop with real structure behind it, or wait for a better setup, because rounding up to 0.01 doubles your intended risk.
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Updated in September 2026