Margin Call Calculator
Find the exact price at which your broker will issue a margin call. Enter the purchase price, shares held, your initial margin and the maintenance margin threshold to see the trigger price and your current equity status.
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Price per share at which your broker will issue a margin call
- 1
Borrowed fraction (1 − initial margin)
1 − 50 ÷ 100 = 0.5 - 2
Maintenance floor (1 − maintenance margin)
1 − 25 ÷ 100 = 0.75 - 3
Margin call price
100 × 0.5 ÷ 0.75 = 66.67The price at which equity shrinks to exactly the maintenance margin threshold.
How does this calculator work?
Margin call price = Purchase Price × (1 − Initial Margin %) ÷ (1 − Maintenance Margin %). Below that price your equity falls below the broker's minimum. Enter price, shares, initial margin (typically 50%) and maintenance margin (typically 25%) to find your trigger threshold.
Formula
How this is calculated
When you buy on margin you borrow a portion of the purchase price from your broker. The initial margin sets the minimum percentage of the total position value you must fund yourself to open the trade. The maintenance margin is a lower floor: if your equity (portfolio value minus the loan) drops below this percentage of the current portfolio value, the broker issues a margin call demanding you deposit more funds or close positions.
The margin call price is derived by setting account equity equal to exactly the maintenance margin percentage of the portfolio value and solving for the share price. The formula is: Call Price = Purchase Price × (1 − Initial Margin %) ÷ (1 − Maintenance Margin %). The loan amount is fixed once the position opens, so as the stock falls your equity shrinks faster in percentage terms than the price does.
This calculator uses the standard US regulatory requirements as a reference (FINRA Rule 4210 sets the minimum maintenance margin at 25%), but many brokers impose stricter "house" limits — particularly for volatile, concentrated, or leveraged positions. The result is a guide for risk management, not a substitute for your broker's exact policies.
Frequently asked questions
Your broker will notify you to either deposit additional cash or securities, or to liquidate positions to bring the account equity back above the maintenance margin. If you do not act quickly the broker can sell your positions without further notice.
Yes. You can deposit extra cash before the threshold is hit to reduce the loan-to-value ratio, or close part of the position to lower the outstanding loan. A stop-loss set above the margin call price is a common protective measure.
Regulators (e.g. FINRA) set minimum maintenance margins but brokers can and often do impose higher house minimums, especially for volatile, illiquid or concentrated positions. Always check your broker's specific margin agreement.
TG we-Calculate Editorial Team. (2026). Margin Call Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/margin-call-calculator
TG we-Calculate Editorial Team. "Margin Call Calculator." TG we-Calculate. 2026. https://we-calculate.com/calculator/margin-call-calculator.
TG we-Calculate Editorial Team, "Margin Call Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/margin-call-calculator
@misc{wecalculate_margin_call_calculator, title = {Margin Call Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/margin-call-calculator}}, year = {2026}, note = {TG we-Calculate} }
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