Lot Size Calculator

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In trading, “lot size” means how big your position is, and it is the single number that turns your stop loss into a known dollar risk. A 30-pip stop on one account can mean a $9 loss and on another a $90 loss. The difference is position size. This calculator tells you exactly how many lots to trade so that hitting your stop costs you a fixed, planned share of your account.

If you came here for the gold lot size calculator, you are in the right place. That tool has been merged into this one with the identical formula, plus a dedicated gold and XAUUSD section below covering contract sizes and gold pip values. (This is the forex and CFD position-size calculator. If you meant property land area, note that “lot size” in trading is unrelated to land measurement.)

What this calculator does

Enter your account balance, the percentage of the account you are willing to risk, your stop loss in pips, and the pip value per standard lot for your instrument. The calculator returns your dollar risk and the position size in standard lots, mini lots, and micro lots. One standard lot is 100,000 units of the base currency, a mini lot is 10,000 units, and a micro lot is 1,000 units.

How the math works

The formula is the standard position-sizing formula used across forex education, and it matches exactly what the calculator on this page computes:

Risk amount = Account balance x (Risk % / 100)
Standard lots = Risk amount / (Stop loss in pips x Pip value per standard lot)

Mini lots are the standard-lot figure times 10, and micro lots are times 100. The actual code on this page was extracted from the live calculator and tested in Node to confirm the prose matches the tool. It also works for gold and other instruments: as long as you enter the correct pip value per standard lot for your broker, the same formula sizes the trade.

Worked example: EUR/USD

Account balance $10,000, risk 1 percent, stop loss 50 pips, pip value $10 per standard lot (the usual figure for EUR/USD):

Step 1: risk amount, $10,000 x (1 / 100) = $100.00.
Step 2: standard lots, 100 / (50 x 10) = 100 / 500 = 0.20.
Step 3: mini lots, 0.20 x 10 = 2.00; micro lots, 0.20 x 100 = 20.00.

The calculator on this page returns $100.00 risk, 0.20 standard lots, 2.00 mini, 20.00 micro, exactly as the steps above show. If your stop were hit, you would lose about $100, which is the 1 percent you planned.

Quick-reference sizing table

For a $10,000 account trading EUR/USD at $10 per pip per standard lot, the calculator gives these standard-lot sizes. The values are rounded to two decimals.

Risk 0.5% ($50): 20-pip stop = 0.25 lots, 30-pip stop = 0.17 lots, 50-pip stop = 0.10 lots.
Risk 1% ($100): 20-pip stop = 0.50 lots, 30-pip stop = 0.33 lots, 50-pip stop = 0.20 lots.
Risk 2% ($200): 20-pip stop = 1.00 lots, 30-pip stop = 0.67 lots, 50-pip stop = 0.40 lots.

Always round the result down to the nearest lot step your broker accepts, never up. Rounding up, even slightly, means risking more than you planned, and the over-risk compounds across many trades.

Gold and XAUUSD lot sizing

Gold is where most traders get lot sizing wrong, because the contract is bigger than it looks. The key facts:

One standard lot of XAUUSD is 100 troy ounces. That means a $1.00 move in the gold price is worth $100 per standard lot, $10 per mini lot (0.10), and $1 per micro lot (0.01). Gold is usually quoted to two decimals, so a $0.01 move, the “pip” on most brokers, is worth $1 per standard lot, and a $0.10 move is worth $10 per standard lot. Pip definitions vary by broker, so check your broker’s contract specifications and enter the pip value per standard lot in the calculator.

Worked gold example: $10,000 account, 2 percent risk, 50-pip stop, $1 pip value per standard lot. Risk amount = $200.00. Standard lots = 200 / (50 x 1) = 4.00 lots (40.00 mini, 400.00 micro). Hitting the stop would cost about $200, the planned 2 percent.

Most professional traders risk 1 to 2 percent of the account per trade. Above that, a short losing streak can do serious damage: at 1 percent, ten consecutive losses cost roughly 10 percent of the account, which is usually recoverable. Position sizing does not account for leverage or margin; leverage changes how much margin a trade ties up, not how much you lose if the stop is hit. And the same direction-agnostic math applies to long and short trades alike, since the size is set by risk, not by direction.

Frequently asked questions

What is a lot in forex trading?

A lot is a standardized trade size. A standard lot is 100,000 units of the base currency, a mini lot is 10,000 units, and a micro lot is 1,000 units. Some brokers also offer nano lots of 100 units. Bigger lots make every pip worth more money, which is why sizing matters.

How do I find the pip value for my pair?

For pairs quoted in US dollars, such as EUR/USD or GBP/USD, one standard lot has a pip value of about $10. For cross pairs and yen pairs the figure differs, and for gold it depends on your broker’s pip definition. Check your broker’s contract specifications or a pip value calculator, then enter the per-standard-lot figure here.

Can I use this calculator for gold (XAUUSD)?

Yes. Enter your balance, risk percent, stop loss in pips, and gold’s pip value per standard lot (often $1 on brokers that quote XAUUSD to two decimals). The worked gold example above shows a $10,000 account risking 2 percent with a 50-pip stop producing 4.00 lots.

Should I round the lot size up or down?

Always down. The calculator gives an exact figure, but brokers accept fixed lot steps. Rounding down keeps your loss at or below the planned risk; rounding up silently increases it.

Does this calculator account for leverage?

No, and that is deliberate. Leverage affects the margin your broker requires, not the dollar risk of the trade. Risk-based sizing answers “how much do I lose if the stop is hit,” which leverage does not change.

What risk percentage should I use?

Most traders use 1 to 2 percent of the account per trade. It is a convention, not a law: lower if you are learning or trading a volatile instrument like gold, and never so high that a normal losing streak threatens the account.

Educational tool only. Trading forex, gold, and CFDs carries risk of loss. This calculator does not provide financial advice.

Pip values, automatically

Pick the pair and the calculator fills the pip value per standard lot for you. The rules it uses:

• Pairs quoted in USD (EUR/USD, GBP/USD, AUD/USD, NZD/USD): one pip is 0.0001, so one standard lot (100,000 units) is exactly $10 per pip.
• USD/JPY, EUR/JPY, GBP/JPY: one pip is 0.01; the USD pip value is 0.01 x 100,000 / the current rate. At 150, that is about $6.67 per lot.
• USD/CHF, USD/CAD, EUR/GBP: pip value = 0.0001 x 100,000 / rate. Type the live rate over the editable default.
• XAU/USD (gold): 1 lot = 100 troy ounces, pip 0.01, so $1 per pip per lot.
• Custom: type any pip value yourself.

Leverage and the risk visualizer

Leverage never changes the correct lot size: it only changes the margin your broker locks up (notional / leverage). The risk meter colors your risk per trade green at 1% or less, amber at 1-2%, red above 2%, and the streak note shows how many consecutive full-stop losses would empty the account at that risk level.

Worked example (verified against the tool)

$10,000 account, 1% risk, 25-pip stop on EUR/USD at 1.0800, 1:100 leverage: risk amount $100; lot size = 100 / (25 x 10) = 0.40 standard lots; position pip value $4.00; notional $43,200; margin required $432.00. Educational estimate only, not financial advice.