Position size & risk calculator
'How much to put into this trade' should not come down to gut feel. First decide the most you are willing to lose of your account on this one trade (beginners should use 1%-2%), then see where your stop sits, and the tool backs out how big a position to buy and how much you actually lose if the stop is hit. Everything runs in your browser. Nothing is uploaded or stored.
If the stop hits, the account drawdown is 0.00%
*20% spot fee discount; the actual rate shown on Binance's page applies and may change with policy.
How the position is backed out
The core is 'decide how much to lose first, then how much to buy'. The loss you can accept per trade = account size × per-trade risk%. With 10,000 in capital and risk set to 1%, this trade is only allowed to lose 100. Then use the stop distance to back out the position: position size = allowed loss ÷ stop distance%. With the stop at -10%, the position matching a 100 allowed loss is 100 ÷ 10% = 1000. That means you buy at most 1000 on this trade, and cutting the position at -10% loses exactly the planned 100.
This method pulls the decision back from 'I want a big position' to 'how much can I lose at most'. The tighter the stop, the larger the position the same risk budget allows; the wider the stop, the smaller the position has to be. Professional traders almost always fix the per-trade risk first and back out the position, not the other way round.
Stock tokens (bStocks) move 24 hours and track the underlying share, so gaps and sharp drops can leave you unable to stop out at your ideal price, and the real loss will be a bit larger than planned. Set the per-trade risk a little lower, don't go all in, and leave room for error. For the common position and mindset pitfalls beginners hit, see 7 first-time mistakes buying bStocks.
Use it alongside the other tools
After working out the position, review how much this trade actually made or lost with the P&L calculator; see what a current holding is worth with the holdings valuation tool. Be sure to read up on the overall risk profile of tokenized US stocks (issuer, custody, de-peg, regulation) in are tokenized US stocks safe before you decide to act.