Margin math is where most retail IBKR users get burned. Enter your equity, position size, entry price, and hold duration — see exactly how much you need posted, where your margin call price sits, and how much interest the loan will cost you. All numbers use IBKR Pro's published Reg-T tiers + USD margin rates as of 2026 (link inside the widget).
These tools are based on the same calculations I use for my own trading on Hyperliquid and OKX. Not theoretical — tested with real money.