What is a lot size calculator?

A lot size calculator is a free tool that tells you the exact position size to trade based on your account balance, risk percentage, and stop-loss distance. It removes the guesswork so every trade is sized to a set risk level instead of a rough estimate.

How do I calculate my lot size?

To calculate your lot size, enter your account currency, balance, risk percentage, stop-loss in pips, and the pair you're trading. The calculator instantly returns the correct lot size, with no formulas or spreadsheets needed.

Why does lot size matter in trading?

Lot size matters because it determines how much money you risk on each trade. Choosing the wrong size means one loss can erase weeks of gains, while sizing every trade to a fixed risk keeps losses controlled and protects your account over time.

What percentage should I risk per trade?

Most traders risk 1 to 2% of their account per trade to survive losing streaks and preserve capital. The right figure is personal, and the calculator lets you test any percentage to see the lot size before you commit. This is general information, not financial advice.

Is the lot size calculator free?

Yes, the lot size calculator is completely free and needs no sign-up. You can use it on any currency pair, as often as you like, before every trade to size your positions with discipline.

Free trading tools

Lot size calculator

Work out the exact position size for any trade. Enter your balance, the risk you'll take and your stop loss, and get your lot size instantly.

Your trade

Instrument

Account balance (USD)

$

Risk per trade

%

Many traders keep this to 1-2%.

Stop loss

pips

1 pip on EUR/USD = 0.0001 in price · $10.00 per 1.00 lot

Recommended position size

0.33lots

33,333 units · 3.3 mini / 33 micro lots

Risk amount$100.00

Pip value per 1.00 lot$10.00

Loss per 1.00 lot at stop$300.00

Pip value at this size$3.33

Using built-in exchange rates

How To Use It

Size every trade in three steps

Position sizing is the simplest way to keep one bad trade from doing lasting damage.

1

Pick your instrument

Choose from 30+ forex pairs, gold, silver, indices and crypto. Pip size and contract size are set automatically.

2

Enter your numbers

Balance, risk percentage and your stop, or entry, stop and target prices for the risk calculator.

3

Trade the output

Get your exact lot size, pip value or risk-reward ratio instantly, converted with live exchange rates.

Note: Values assume a USD account and standard contract sizes (100,000 units forex, 100oz gold, 5,000oz silver, 1x indices and crypto CFDs). Contract specs vary by broker, so always confirm with yours. This tool is for general risk management and is not financial advice.

Calculator FAQ

Trading calculator questions

The maths behind each calculator, and the numbers most traders ask about first.

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How do you calculate lot size in forex?

Lot size = (account balance x risk %) ÷ (stop loss in pips x pip value per lot). Work out your risk amount first, then divide it by what you'd lose per lot at your stop distance.

What is a good risk percentage per trade?

Many traders risk 1-2% of their account per trade, so a run of losses doesn't do serious damage. The right figure depends on your strategy and risk tolerance.

How is pip value calculated?

Pip value per lot = pip size x contract size, in the quote currency. For EUR/USD that's 0.0001 x 100,000 = $10. For pairs not quoted in USD, that amount is converted to dollars at the current exchange rate, which this calculator does automatically.

What is a good risk-to-reward ratio?

Many traders look for at least 1:1.5 or 1:2, risking one unit to make one and a half or two. A higher ratio means you can stay profitable with a lower win rate.

Does this work for gold, indices and crypto?

Yes. Gold uses a 100oz contract (about $1 per point per lot), silver 5,000oz, and indices and crypto use 1x CFD contracts where one lot is worth roughly one unit of the quote currency per point. Broker contract sizes vary, so confirm with yours for exact figures.

What does slippage cost me?

Every pip lost to a late or missed entry has a dollar value. Multiply your signals per week by the pips you typically lose per entry and your value per pip, and the monthly figure adds up fast. The slippage calculator does this for you.

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