How to size a trade based on risk and stop distance

1. Account size and risk

   "Account size" is your trading capital. "Risk % of account" is the slice you're willing to lose on this idea (0–100; common values are 0.25–2%). Negative or > 100 throws a clear error.

2. Stop distance in price units

   "Stop distance (price units)" is how far from entry your stop sits, in the instrument's price units (dollars for stocks, pips for FX expressed as price, ticks for futures). Sign doesn't matter — the absolute value is used.

3. Pick the contract step

   "Contract step" decides how the position is counted: Single unit (1 share/coin/contract), Micro lot (1,000 base units), Mini lot (10,000), Standard lot (100,000), or Custom. Custom mode requires "Custom units per increment".

4. Press Run

   Result returns positionSize (in base units), riskAmount (account × risk%, in currency), unitsPerIncrement (the resolved step size), and incrementCount (how many lots/contracts to enter).