Position size calculator.
Three numbers and one division: how many coins to buy so a stopped-out trade costs exactly the percentage you planned — and not more.
Pick a coin and fill in account, risk and stop — instant math, right in your browser.
Classic fixed-risk formula: size = (account × risk%) ÷ distance to stop. Fees and slippage are not included. Prices are live market data.
The calculator does the math. It cannot see the market.
Liquidation price, position size, stop distance — that is arithmetic. Whether price actually reaches your stop, what funding is doing, which way open interest leans and where other traders’ liquidations are stacked — that is analysis. Moami’s team of AI analysts examines your position against live market data and returns scenario probabilities, not opinions.
Analyze my position — freeOne-minute signup · no card required · first analysis is free
How fixed-risk sizing works
The idea is simple: first you decide how much you are willing to lose on this trade, and only then do you compute the size. Not the other way round.
The distance to the stop sits in the denominator. Hence the key practical takeaway: the tighter the stop, the larger the position and the higher the leverage required. If the calculator shows ×30 leverage, the problem is not your account size — it is that your stop sits inside market noise and will almost certainly get clipped.
Where to put the stop itself is a separate question: not a percentage from entry, but the level where your thesis breaks. We cover it in detail in our stop-loss and position sizing articles.
FAQ
How is position size calculated?
Using the fixed-risk formula: position size = (account × risk per trade %) ÷ distance to stop %. For example, with a $1,000 account, 1% risk and a stop 2% from entry, the position size is $500 — if the stop is hit you lose exactly $10.
What risk percentage per trade should I use?
The classic risk-management range is 0.5–2% of the account per trade. At 1% risk, ten losing trades in a row cost about 10% of the account — survivable. At 10% risk the same streak nearly wipes the account out.
What does “leverage required” mean?
If the calculated position size exceeds your account, the difference has to be borrowed from the exchange — that is leverage. The calculator shows the minimum leverage for that size. If it is above ×20, your stop is too tight: the position is vulnerable to ordinary market noise.
Is it free? Do I need to sign up?
Yes — the calculator is completely free and requires no registration. The math runs in your browser; the numbers you enter are not sent anywhere.
My position size is correct — is that enough?
Sizing protects your account from losing streaks, but it does not answer whether the trade is worth taking at all. Entry quality, market conditions and the risk/reward ratio — that is analysis. Moami’s team of AI analysts does it on live market data; your first analysis is free.