Margin Call Price Calculator

About this calculator

When you buy stock on margin, your broker lets you borrow part of the purchase price against your existing equity — but if the share price falls far enough that your equity as a percentage of the position drops below the broker’s maintenance margin requirement, you get a margin call demanding you deposit more cash or sell. For a long position, the formula is margin call price = purchase price × (1 − initial margin %) / (1 − maintenance margin %), which finds the exact price where your equity percentage hits the maintenance floor.

Margin traders and brokers both watch this number closely: traders use it to know in advance exactly how far a stock can drop before they’re forced to act, and brokers set it as an automated trigger for issuing calls or, if the trader doesn’t respond, force-liquidating the position. Maintenance margin requirements are typically set by exchange rules (FINRA’s minimum is 25% in the US) but many brokers require higher house minimums, especially for volatile stocks.

This calculator takes your purchase price, initial margin percentage and maintenance margin percentage and returns the exact share price at which your broker issues a margin call.