Crypto Position Size Calculator

How it is calculated

The tool works backward from the loss you accept. Risk amount = A × r / 100, Units = Risk amount / |E − S| and Position value = Units × E. A is account size, r is the percent of the account you will risk on one trade, E is entry price and S is stop-loss price, all in the same currency. The units are shown with four decimals, but the position value uses the unrounded units. The distance to the stop is taken as an absolute value, so a stop above the entry (a short trade) gives the same size as a stop the same distance below. All four values must be above zero, the risk percentage cannot exceed 100, and the stop cannot equal the entry; otherwise there is no result. Position value is not capped at your account size, and fees and slippage are not included.

Common mistakes

• Entering risk as a fraction (0.01). The field is a percentage, so 0.01 means 0.01% of the account, and the position becomes a hundred times too small.
• Typing a risk of exactly 100. The tool accepts it and sizes a trade that loses the whole account if the stop is hit; anything above 100 gives no result.
• Using a tight stop to get a bigger position. A stop $100 away from the entry gives a position worth $60,000 on a $10,000 account, which needs leverage and is easily stopped out by normal noise.
• Placing the stop at a round number without thinking about where the trade is invalid. The stop should come from the chart, and the size follows from it.
• Ignoring fees and slippage. A stop can fill at a worse price in a fast market, so the real loss can exceed the planned risk amount.