Margin Call Price Calculator
From the purchase price, initial margin ratio and maintenance margin ratio, find the price at which a leveraged purchase triggers a margin call.
Input Data
Results
At a glance:A margin call is triggered when your equity falls below the maintenance margin requirement. With purchase price P, initial margin i% and maintenance margin m%: loan = P × (1 − i ÷ 100); the margin-call price S satisfies (S − loan) ÷ S = m ÷ 100, so S = loan ÷ (1 − m ÷ 100).
Formula
Loan = purchase price × (1 − initial margin% ÷ 100).
Margin-call price = loan ÷ (1 − maintenance margin% ÷ 100).
$$P_{call} = P_{buy} \cdot \dfrac{1 - m_{initial}}{1 - m_{maintenance}}$$How to Use
- Enter the purchase price per unit.
- Enter the initial and maintenance margin ratios (%).
- Read the price that triggers a margin call.
FAQ
What is a margin call and why does it happen?
A margin call is a demand from your broker for you to deposit more cash or collateral after your equity (market value of the position minus what you borrowed) falls below the required maintenance margin. When you buy on margin you put down only part of the value (the initial margin) and borrow the rest. The loan amount is fixed, but as the price falls the market value shrinks, so your equity falls faster and its share of the value drops. Once it hits the maintenance level, the broker issues a margin call, and if you cannot top up in time, your position may be force-closed (liquidated) at a loss.
How is the margin-call price calculated, and how do the ratios affect it?
Margin-call price = purchase price × (1 − initial margin%) ÷ (1 − maintenance margin%). The loan is purchase price × (1 − initial margin%), which stays fixed while price falls. A lower initial margin (more borrowed, higher leverage) makes the numerator larger, pushing the call price closer to the purchase price — so a small drop triggers a call. A higher maintenance margin makes the denominator smaller, also raising the call price and making it easier to be called. With price 100, initial 50% and maintenance 25%, the call price is about 66.67 (a ~33% drop before the call); with initial 30% and the same maintenance, it rises to about 93.33 (only a ~7% drop).
What should I watch out for when using this calculator and trading on margin?
Several things. First, margin ratios differ by broker, market and security and can be raised at short notice, especially for volatile stocks, so the actual trigger may be stricter than shown. Second, this tool ignores margin interest and fees — interest accrues daily and erodes your equity, so a call can come earlier than the price model suggests. Third, calls and liquidations can happen very fast in a sharp sell-off, sometimes with little notice. Fourth, leverage can produce losses exceeding your initial deposit in extreme gaps or halts. This calculator models the long side only. Use it for teaching and estimation, not as investment advice; always check your broker's contract.
I received a margin call — what should I do, can I ignore it?
Do not ignore it. You generally have three options: deposit cash to raise your equity back above the maintenance level; pledge additional acceptable collateral; or voluntarily sell part of the position to repay some of the loan and reduce leverage. Ignoring it is risky — if you miss the (often very short) deadline, the broker can force-close your holdings without further notice, typically at the worst moment, and in extreme cases the proceeds may not cover the loan, leaving you to make up the shortfall. Practical tips: calculate the call price and a buffer before using margin, set price alerts, keep reserve cash for top-ups, and only risk capital you can afford to lose.
Why does higher leverage bring the call price closer to the entry price?
Because the loan is fixed but the market value falls with the price. Your equity = market value − fixed loan, so as the price drops, equity falls faster than the value itself; the more you borrowed, the bigger that fixed loan looms. A lower initial margin raises the formula's numerator, lifting the call price toward the purchase price, so even a small dip triggers a call. This is the double edge of leverage: it amplifies gains when prices rise, but also amplifies losses and the speed of a margin call when they fall. Keep a comfortable buffer and avoid maxing out leverage, especially on volatile stocks.
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References
Content review: Calculatorism Finance Team. Results are for reference only; please refer to the relevant authorities for the official figures.