How to use this calculator
- Enter initial share price, initial equity margin (%), maintenance margin (%).
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Assumptions and limitations
Single long position, constant borrowing and no interest; broker house rules and intraday requirements can differ.
Worked example
With initial share price = 100, initial equity margin (%) = 50, maintenance margin (%) = 25, modeled margin-call price is approximately 66.666667.
What the result means
Estimate the stock price at which equity reaches a chosen maintenance fraction.
Common questions
How should I interpret modeled margin-call price?
Estimate the stock price at which equity reaches a chosen maintenance fraction.
What should I check before using this result?
Single long position, constant borrowing and no interest; broker house rules and intraday requirements can differ.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.