Free tool
Futures position size calculator
Work out how many contracts to trade for a given stop and a given risk, on any CME index or commodity future. Then see the part most calculators leave out: what that trade costs you against a prop-firm drawdown, and how many losses in a row it would take to end the account.
Your account
Nothing is saved or sent anywhere. These two numbers are what let the calculator show drawdown risk rather than just a contract count.
Why this number is higher than reality
This simulation assumes you take the edge you typed, every time, without deviating. Published pass rates for real evaluations sit in the single digits to the low teens, and a positive edge executed mechanically comes out far above that. The distance between the two is not the maths being wrong. It is the daily loss limit taken one trade too late, the size raised after a loss, the day traded that should have been skipped. That gap is the whole subject of the course, and no calculator closes it.
Why contract count is the easy half
Every position size calculator does the same arithmetic: risk divided by stop distance times tick value. That part is not hard and it is not where people get hurt. What ends most evaluations is not one badly sized trade, it is a normal run of losses against a drawdown that was never big enough to absorb it. So this one asks for your drawdown too, and tells you how many consecutive losers it allows at the size you just chose. If that number is small, the size is wrong, however correct the arithmetic was.
How to use it
Pick your contract, enter where your stop goes in points or ticks, and set what you are willing to lose on the trade. The calculator returns the contract count that fits, the exact dollar risk it works out to, and what each tick is worth at that size. If you have entered an account, it also shows how far into your drawdown the trade reaches.
This calculator is a tool for education, not financial advice, and it does not know your circumstances. Futures trading carries substantial risk of loss. Contract specifications change; confirm them with your broker before trading.