Why futures math trips people up
Futures don't move in dollars. They move in ticks, and each contract has its own tick size and its own fixed dollar value per tick set by the exchange. That conversion factor is the thing standing between "the market moved four points" and "my account moved $200," and it's different for every product you trade.
Get it wrong and every downstream number is wrong with it. Position size, stop distance in dollars, risk per trade, and realized P&L all reduce to tick math underneath. A trader who sizes a crude oil position using equity index assumptions isn't slightly off — they're off by a multiple.
Every calculator here has the standard CME contract specifications built in, so you pick the product rather than looking up its multiplier. The specs are informational and worth confirming against your broker, particularly for fees and margin, which vary by firm.
Minis, micros, and why the distinction matters
Most major contracts come in two sizes. The E-mini S&P 500 (ES) moves in 0.25-point ticks worth $12.50 each, making a full point $50. The Micro E-mini (MES) tracks the same index at one-tenth the size — the same one-point move is $5.
The mechanics are identical; the exposure is not. Micros exist precisely so a trader can size a position properly on a smaller account rather than being forced into a contract that puts too much at risk on a single trade. Selecting the wrong one in a calculator produces a number that's off by a factor of ten, which is why the contract dropdown comes before anything else on every tool here.
Sizing before entering, not after
The order of operations that keeps traders solvent is unglamorous: decide what you're willing to lose on the trade, measure where your stop actually belongs based on the chart, and let those two numbers determine your contract count. Not the reverse.
Sizing by conviction — taking more contracts because a setup feels strong — is how a single loss ends up larger than several wins combined. The position size calculator exists to make that calculation take five seconds, so there's no excuse to skip it.
Risk/reward is the companion question. A setup risking 12 ticks to make 12 ticks needs to win more than half the time to survive costs. One risking 12 to make 36 can be profitable winning a third of the time. Neither ratio is correct in isolation — what matters is whether it matches how your strategy actually performs, which you learn from your own trade record rather than from a rule of thumb.
What these tools don't do
These are arithmetic tools. They don't account for commissions, exchange and clearing fees, slippage, or margin requirements — all of which are real costs that vary by broker and matter disproportionately on micro contracts, where fees are a larger share of each trade.
They also don't provide trade ideas, signals, or advice. Nothing here is a recommendation to buy or sell anything. Futures trading involves substantial risk of loss and isn't suitable for every investor.