Plan the whole trade in one place
Margin, PnL, ROE and liquidation are one system β change leverage and all four move. Seeing them together stops nasty surprises. Dig into each with the liquidation and PnL calculators.
The four numbers every futures trade has
Before entry, a leveraged position is fully described by four numbers: position size (collateral Γ leverage), liquidation distance (~1/leverage minus maintenance margin), fee cost (size Γ taker rate Γ 2 for the round trip), and PnL per 1% move (size Γ 1%).
Worked example β $200 collateral at 15x: position $3,000, liquidation ~6.2% away, round-trip taker fees about $3.30 (0.055% Γ 2 Γ $3,000), and every 1% move is $30 against your $200 margin, so 15% ROE per 1%. That last number is the one that ends accounts: a routine 3% wick is 45% of your margin.
People calculate the upside and skip the fee line. At 15x, those $3.30 in fees are 1.65% of your collateral gone at entry β you start every trade down. Small edge strategies die from this alone.