Lot Size Calculator

Enter your balance, risk percentage and stop loss in pips to find the lot size that keeps your loss to the amount you chose.

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Sizing a forex trade

Most traders decide how much of the account they will risk on one trade, often 1% to 2%, and then set the position size so that a stop-loss exit costs exactly that amount. The risk amount is your balance times the risk percentage. The lot size is the risk amount divided by the stop loss in pips and by the value of one pip for one lot.

An example

With a 10,000 USD account risking 1%, you can lose 100 USD. If your stop loss is 50 pips away on EUR/USD, where a pip on one standard lot is worth 10 USD, a full lot would risk 500 USD. The right size is 100 ÷ 500, which is 0.20 lots, or two mini lots. The calculator shows the size in standard, mini and micro lots and in units.

Rounding and limits

Brokers allow only certain lot steps, often 0.01 lots, so round the result down to stay within your risk. Remember that the stop loss is not guaranteed in a fast market, and that spreads and slippage can add to the loss. The margin the position needs depends on your leverage, so check it with the margin calculator.

Forex trading with leverage carries a high risk of loss. This calculator does simple arithmetic and is not financial advice. Exchange rates are loaded from a public service and are mid-market rates, so the price your broker shows will differ slightly.

Common questions

How do I calculate lot size?

Divide the amount you are willing to risk by the stop loss in pips times the pip value of one lot.

What percentage should I risk per trade?

Many traders risk 1% to 2% of the account on a trade. Smaller risk helps the account survive a losing streak.

Does leverage change my lot size?

Not through this method. The size is set by your risk, not by leverage, though leverage decides how much margin the position uses.

What is a micro lot?

A micro lot is 1,000 units of the base currency, or 0.01 of a standard lot.

Should I round up or down?

Round down, so the loss at your stop does not exceed the amount you planned to risk.

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