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Buying Power and Margin Capacity Scenario Calculator — result sheet
Estimate margin excess and a transparent additional-notional scenario from equity, an existing position, reserve cash, and entered margin percentages.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Maintenance requirement = current position notional × maintenance margin rate; margin excess = account equity − maintenance requirement − cash reserve; estimated additional notional capacity = max(0, margin excess) ÷ initial margin rate.
This worksheet keeps the inputs visible instead of pretending that one buying-power rule applies to every broker. It estimates the additional notional that the entered equity could support after an existing maintenance requirement and a reserve, using the entered initial margin percentage.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Account equity — account currency; minimum 0.01; maximum 1000000000000000
- Current position notional — account currency; minimum 0; maximum 1000000000000000
- Maintenance margin — %; minimum 1.0E-6; maximum 100
- Initial margin for a new position — %; minimum 1.0E-6; maximum 100
- Cash reserve to hold back — account currency; minimum 0; maximum 1000000000000000
Worked example
| Input | Value |
|---|---|
| Account equity | 10000 |
| Current position notional | 0 |
| Maintenance margin | 25 |
| Initial margin for a new position | 50 |
| Cash reserve to hold back | 1000 |
With 10,000 of equity and a 1,000 reserve, the margin excess is 9,000 and the entered 50% initial margin assumption gives an estimated 18,000 of additional notional capacity.
Assumptions and limits
- Account equity, reserve, and margin amounts use the same currency units.
- The current position notional is an entered scenario value, not a broker mark-price calculation.
- Maintenance and initial margin percentages are entered for the specific product or account being studied.
- The reserve is held back before the new-capacity estimate is calculated.
- The estimate assumes the entered percentages stay constant.
- The estimate is not a day-trading buying-power rule or a promise of executable capacity.
- Broker house requirements can be higher than regulatory minimums.
- Concentration, liquidity, volatility, haircut, and instrument eligibility rules are excluded.
- Interest, commissions, funding, taxes, and forced-liquidation procedures are excluded.
- A negative margin excess is displayed rather than converted into new capacity.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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