Lot size calculator by risk

Balance, risk and stop loss — and you know the lot whose loss at the stop is close to the risk you chose. If even the minimum lot risks more, the calculator warns you. For MetaTrader 5 and MetaTrader 4, a USD account.

—lot

Risk at this lot—

Stop—

Point value at 1 lot—

Profit at TP · R:R—

The lot is rounded down to 0.01 so the risk is not exceeded; if the minimum lot is larger than the result, the risk is higher than set — the panel in the terminal warns about this too. Spread, commission and slippage are not included here. Brokers' contract sizes differ — check the symbol specification in MT5.

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How the lot is calculated

The lot is chosen so that the loss at the stop equals the risk amount you picked in advance.

lot = risk amount ÷ (distance to stop × value of 1 price unit at 1 lot)

Risk amount: 1% of $10,000 is $100.
Gold, entry 4130.00, stop 4124.00: 6.00 in price to the stop.
XAUUSD usually has 100 ounces per lot: 1.00 in price at 1 lot is $100, and 6.00 is $600.
$100 ÷ $600 = 0.166 → lot 0.16 (down to the 0.01 step), risk $96.

For pairs where the dollar comes first (USDJPY, USDCHF, USDCAD), the loss is in the quote currency and is converted to dollars at the price. The calculator uses the lower of the entry and stop prices: the point value comes out slightly higher and the lot errs on the safe side.

The same — in one move on the chart

In TradeDeck the lot is calculated by your broker's real symbol specification: set the risk, drag the stop line — the lot is ready, and you can manage the trade from your phone too.