IntelliTrade tools

Lot Size Calculator

Position size calculator for forex, gold & indices

Use this free lot size calculator to determine the correct position size based on your account balance, risk per trade, stop loss distance, and account currency — with live exchange rate conversion built in.

Live exchange ratesForex, gold & indicesRisk-based sizingFree tool
Guide & FAQ
Position inputs
Account, pair, stop, and risk settings
Account currency
Currency pair
Account balance
EUR
Risk per trade
%
Stop loss distance
pips
Position size
—
lots
Risk amount
—
Pip value / lot
—

For educational and planning purposes only. Always verify instrument specifications and contract details with your broker.

SECTION 01

How the lot size calculator works

The calculator follows a simple idea: define the money you are willing to lose on the trade, then solve for the position size that matches that risk if the stop loss is hit. It uses your account balance, risk percentage, stop loss distance, and instrument context — including live currency conversion where needed.

Step 1

Enter your account balance and currency

Your account balance and currency anchor the entire calculation. Every other output is expressed relative to these values.

Step 2

Select the pair or instrument

The calculator loads the correct pip size and contract specification for your selected instrument — forex, gold, silver, or crypto.

Step 3

Enter your risk per trade and stop loss

Risk per trade is a percentage of your balance (e.g. 1%). Stop loss distance is in pips. Together these define how much money is at risk.

Step 4

Get your position size

The calculator returns your position size in lots, the risk amount in your account currency, and the pip value per lot — using live conversion logic where needed.

Formula: Position Size (lots) = Risk Amount ÷ (Stop Loss in pips × Pip Value per 1.00 lot)
SECTION 02

Lot size calculator examples

The examples below use the same formula the calculator applies. They illustrate how different instruments, currencies, and stop distances change the resulting lot size.

Example 1 — EURUSD

Balance
$5,000
Risk
1% ($50)
Stop loss
30 pips

Result

0.17 lots

EURUSD pip value ≈ $10/pip/lot. Risk per lot with 30-pip stop = 30 × $10 = $300. Position size = $50 ÷ $300 = 0.17 lots.

Example 2 — GBPJPY

Balance
$5,000
Risk
1% ($50)
Stop loss
30 pips

Result

≈ 0.25 lots

With USDJPY at 150, pip value per lot in USD ≈ 1,000 ÷ 150 = $6.67. Risk per lot = 30 × $6.67 = $200. Position size ≈ $50 ÷ $200 ≈ 0.25 lots.

Example 3 — Gold (XAUUSD)

Balance
$10,000
Risk
1% ($100)
Stop loss
200 pips ($2.00)

Result

0.50 lots

Gold: 1 lot = 100 oz, pip = $0.01. Pip value/lot = $1.00. Risk per lot with 200-pip stop = $200. Position size = $100 ÷ $200 = 0.50 lots (50 oz).

Note on gold: Many platforms quote gold to 2 decimals — 1 pip = $0.01. A $2.00 stop is 200 pips. A $20.00 stop is 2,000 pips. If your platform shows open and stop price, the stop distance is simply the price difference.
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Common position sizing mistakes

Most sizing errors come down to a few repeatable mistakes. Knowing them upfront saves you from results that look wrong even when the formula is right.

Mixing pip and price stops

Some tools take a stop loss in pips, others take an open price and stop price. Make sure you are comparing the same stop distance.

JPY pip convention

JPY pairs use a pip size of 0.01, not 0.0001. A 30-pip stop on GBPJPY is a 0.30 move in price.

Contract size differences

Some brokers use gold contracts of 100 oz per lot, others use 10 oz or 1 oz. The same lot size can represent a different exposure depending on the broker.

Deposit currency conversion

A pip value can change when your account currency changes. The trade might look larger or smaller only because of currency conversion.

Confusing micro, mini, and standard lots

In FX, 1.00 standard lot is 100,000 units, 0.10 is a mini lot, 0.01 is a micro lot. Metals and indices follow different contract definitions.

Using fixed lot sizes instead of risk-based sizing

A fixed lot size ignores your account size and stop loss distance. Two trades with the same lot size but different stops carry completely different risk amounts.

Tip: If a result looks too big or too small, check only two things first: (1) contract size, and (2) what the tool means by pip or tick.
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Lot size calculator FAQs

What is a lot size calculator?

A lot size calculator determines the correct position size (in lots) based on your account balance, risk per trade percentage, and stop loss distance. It removes guesswork from position sizing by calculating exactly how many lots to trade so that if your stop loss is hit, you lose only the amount you defined as acceptable risk. Most trading accounts do not fail because of one bad trade — they fail because of normal losses combined with oversized positions. A lot size calculator prevents that by keeping every trade sized consistently.

How do I use this position size calculator?

Select your account currency. Choose the pair or instrument you want to trade. Enter your account balance. Enter your risk per trade as a percentage (e.g. 1%). Enter your stop loss distance in pips. The calculator returns your position size in lots, the risk amount in your account currency, and the pip value per lot.

How is lot size calculated?

The calculation follows three steps. Step 1 — Risk Amount: Account Balance × Risk % = the maximum you are willing to lose on this trade. Step 2 — Pip Value: convert your stop loss distance into money using the instrument's pip value. If the instrument is quoted in a different currency than your account, the pip value is converted into your deposit currency first. Step 3 — Position Size: Position Size (lots) = Risk Amount ÷ (Stop Loss in pips × Pip Value per 1.00 lot).

Does this calculator work for forex, gold and indices?

Yes. The logic works for any instrument if you know the tick or pip size and the contract specification (what 1 lot represents). The calculator supports FX majors, crosses, gold (XAUUSD), silver (XAGUSD), and other instruments. Some brokers define metals, indices, and crypto contracts differently, so always sanity-check contract size with your broker.

What happens if my account currency differs from the quote currency?

The calculator handles currency conversion automatically using live exchange rates. When your account currency differs from the instrument's quote currency, the pip value is first calculated in the quote currency and then converted to your account currency. A pip value can change when your account currency changes, making a trade appear larger or smaller due to conversion alone.

What is the difference between a micro, mini, and standard lot?

In FX, 1.00 standard lot is 100,000 units, 0.10 is a mini lot (10,000 units), and 0.01 is a micro lot (1,000 units). Metals and indices follow different contract definitions — for example, 1 lot of gold (XAUUSD) is typically 100 troy ounces, not 100,000 units. Always check your broker's instrument specifications.

Can I use this calculator with prop firm rules?

Yes. Prop rules are usually based on daily drawdown and maximum loss. Position sizing helps you translate those limits into a consistent per-trade risk. By setting your risk % to stay within the prop firm's allowed parameters, you can use this calculator to size every trade accordingly.

What risk percentage do most traders use?

There is no universal best number. Many traders operate somewhere between 0.25% and 2% depending on strategy, volatility, and objectives. Focus on survivability first: smaller risk generally reduces drawdowns and makes losing streaks easier to tolerate without taking you out of the game.
Read the full guide & FAQ
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Terms and disclaimers

Full legal disclaimer. This is an educational resource only, not investment advice.