How much could slippage cost me on this trade based on my order size and the bid-ask spread?

How this is calculated

• This estimate assumes you cross roughly half the quoted bid-ask spread on entry, and half again on exit, which is a common simplification for a market order or an aggressively priced limit order.
• Wider spreads, thinner order books, and fast-moving stocks can all push actual slippage above the quoted spread. Use the extra slippage field to account for that on lower-liquidity names.
• This is an estimate, not a live fill price. Your actual fill depends on order type, order book depth at the moment you trade, and market conditions.
• Pair this with the Commission Cost Calculator to see your full trading cost picture: commissions and slippage together.
• Pair this with the Average Daily Volume Liquidity Calculator before sizing into a position on a lower-volume stock, since order size and slippage move together on thin names.