Crypto Futures Position Size Calculator
The quantity to trade from your account and the percentage you are willing to lose, with fees and GST counted, rounded to the exchange's step, and checked against the liquidation price.
How the size is worked out
The money you risk is your account × risk %. Each unit of the contract loses the distance from entry to stop-loss, plus the entry fee and the stop's exit fee (a stop-loss fills as a market order, so it pays the taker fee), plus GST on both. Quantity = money at risk ÷ loss per unit, rounded down to the exchange's quantity step.
Leverage does not change how much you lose at the stop; it changes how much margin the position locks and where the liquidation price is. If the liquidation price comes before your stop-loss, the exchange closes the position first and the whole margin is lost, so the calculator shows the highest leverage that keeps liquidation beyond the stop.
Funding is not included: it depends on how long you hold. The crypto futures calculator adds it for a holding time you choose.
Frequently Asked Questions
How much of my account should I risk on one futures trade?
Many traders keep it to 1–2% of the account per trade so that a run of losses does not wipe them out. The calculator takes whatever percentage you choose.
Does higher leverage mean a bigger loss at my stop-loss?
No. The loss at the stop depends on the quantity and the distance to the stop. Leverage only changes the margin locked up and how close the liquidation price is.
Why does the quantity include fees?
Because the entry fee, the stop's exit fee and GST are part of what you lose if the stop is hit. Leaving them out makes the real loss bigger than the risk you chose.