Crypto trading calculators: position size, leverage, liquidation
Size a trade before you click buy — so one bad stop cannot wipe the account.
Use them in this order: position size (how big), then leverage and liquidation (can the venue close you first), then futures / PnL (what you make or lose), then Kelly if you want a second opinion on how large a fraction of the account to risk, then funding if you will hold a perpetual overnight. New to the math? How much to risk per trade, then what liquidation price is.
Position Size Calculator
Size a crypto or futures trade from account risk and stop distance.
Start with this tool →Leverage Calculator
Margin required, max notional, and effective leverage.
Open tool →Liquidation Price Calculator
Isolated USDT-M liquidation with per-exchange maintenance-margin presets.
Open tool →Margin Calculator
Initial vs maintenance margin on crypto futures.
Open tool →Futures Calculator
Estimate perpetual PnL, fees, margin, and ROE.
Open tool →PnL Calculator
Net long/short profit or loss after fees.
Open tool →Kelly Criterion Calculator
Full, half, and quarter Kelly from win rate and payoff.
Open tool →Funding Rate Calculator
What perpetual funding costs or pays over 8-hour intervals.
Open tool →Guide
What crypto trading calculators are for
A futures calculator without a size is how accounts blow up. The job is not “pick 10× because a thread said so.” The job is: decide the price that proves you wrong, decide how many dollars that mistake may cost, then see how big the trade can be. That is the position size calculator. Everything else on this page hangs off that number.
Searchers look for a futures calculator, a liquidation price calculator, or a kelly criterion calculator as separate toys. They are one workflow. Size first. Liquidation second if you use leverage. PnL third so fees do not surprise you. Funding last if you sleep in the trade.
Method
How to calculate crypto position size
You pick a percent of the account you can lose on this one idea — often 0.5% to 1%. You pick a stop: how far price can go against you. The calculator turns those into a dollar amount at risk and a coin quantity. Leverage does not change the dollar loss at the stop. It only changes how much margin you lock. If that sentence is new to you, start on the position size page, not on a 20× slider.
Example
Position size example: $10,000 Bitcoin long, 1% risk
Account $10,000. Risk $100 if the idea is wrong (1%). Bitcoin is $50,000. Stop 2% below, at $49,000. Position value is $5,000, or 0.10 BTC. At 5× you post $1,000 of margin — still $100 at risk if the stop hits. Then check liquidation price so the venue cannot close the trade before $49,000. Then run the futures calculator for fees. That is a trading session. Not seven open tabs of equal weight.
Mistakes
Common mistakes on crypto trading calculators
- Opening leverage before you have a stop.
- Risking 1% on five coins that all dump together.
- Ignoring funding on a multi-day perpetual.
Formulas: methodology. Next door: profit calculators if you already closed the trade.