Crypto Position Size Calculator

Position sizing is the one risk decision that matters most, and the one beginners skip. The professional approach is fixed-fractional risk: decide what percent of your account you are willing to lose on a trade, then size the position so that being stopped out loses exactly that and no more. Your size comes out of your stop, not your conviction.

risk amount   = account balance × risk %
stop distance = |entry − stop|
position size = risk amount / stop distance
notional      = position size × entry price

How much should I risk per trade?

The widely taught answer is 1-2% per trade. At 1%, you can lose 20 trades in a row and still keep about 82% of your account; at 10% per trade, that same losing streak wipes you out. Small, consistent risk is what keeps you in the game long enough for an edge to play out. Tighter stops let you take a larger position for the same risk, but a stop placed too tight just gets hit by noise, so size follows a stop you can actually justify, not the other way around.

The take-profit targets above are expressed in R multiples, where 1R is the amount you risked. A setup that risks 1R to make 2-3R can be profitable even with a win rate well under 50%. That is why a position-size calculator and a leverage calculator belong together: sizing sets how much you can lose, leverage sets how fast.

Knowing the formula and executing it under pressure are different skills. The way to make consistent sizing automatic is reps, which is what paper trading on Hex37 is for: place the size this calculator gives you on live prices with fake money until risking a fixed fraction stops feeling like a sacrifice and starts feeling like the default.