Implementation guide · Market Mechanics
Leverage and Required Margin: A Worked Calculation
Work through notional and margin-rate calculations, then check tiering, currency conversion and contract-specific exceptions before applying them.
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Published by FxTrusts, a supplier of brokerage and prop firm technology. Prepared with AI-assisted research and drafting; reviewed against the cited public sources. Examples are illustrative. Product links describe our services.
Quick answer
In a simple percentage-margin model, required margin equals notional exposure multiplied by the margin rate. A 5% rate corresponds to a 20:1 notional-to-margin ratio. Real platform calculations can depend on the instrument, account leverage, currency, tiers and hedged-position rules.
Use the simple model only when it applies
The reciprocal relationship between margin rate and leverage is a convenient starting point: 1 divided by 0.05 equals 20. It describes the collateral ratio in that model, not the amount an account should trade. Some instruments use fixed initial margin per contract or a different calculation mode. The MetaTrader margin documentation explicitly describes multiple models, so account leverage alone is not enough to reproduce every displayed requirement.
Keep notional and account currencies separate
If notional is expressed in a different currency from the margin requirement, identify when conversion occurs and which rate is applied. A reference worksheet can use one stated rate to make the calculation understandable. An actual reconciliation needs the platform’s instrument settings and conversion convention. Rounding too early, using yesterday’s rate or reversing the quote direction can produce a discrepancy even when the margin percentage is correct.
Check incremental margin for a new order
The additional margin required by an order may differ from the order’s standalone margin. Existing positions, netting, hedging rules and pending orders can change the calculation. For example, reducing a position is not the same as opening an independent opposite position in a hedging account. A pre-trade check should compare the account before and after the proposed order using the actual model, rather than blindly adding two standalone estimates.
Look for tiers and changing requirements
A tiered schedule can charge one rate on the first portion of exposure and a higher rate on the excess. Other policies can change requirements around market conditions or specified events. Record the applicable schedule and effective time instead of assuming a single permanent leverage number. Higher leverage reduces initial collateral under the simple model but does not reduce the underlying price sensitivity of a fixed position.
Single-rate and tiered margin examples
Assume 60,000 USD of linear notional exposure with no conversion, offsets or pending orders. These rates are synthetic and are not an FxTrusts offer or a regulatory limit. The tiered model applies each rate only to its assigned slice, rather than applying the higher rate retroactively to the entire amount.
| Model | Calculation | Required margin |
|---|---|---|
| Uniform 5% | 60,000 × 0.05 | 3,000 USD |
| First 40,000 at 5% | 40,000 × 0.05 | 2,000 USD |
| Remaining 20,000 at 10% | 20,000 × 0.10 | 2,000 USD |
| Total under tiered example | 2,000 + 2,000 | 4,000 USD |
Implementation checklist
- Identify the instrument’s calculation mode and relevant currency.
- Read the full margin schedule, including tiers and effective times.
- Check existing positions, pending orders and netting or hedging treatment.
- Compare the estimated incremental requirement with the platform result before relying on it.
Sources
These documents support the reference. Check the original publication for current requirements and the limits of its scope.
- MetaTrader 5 margin calculationwww.metatrader5.com
- MQL5 account propertieswww.mql5.com
- MQL5 symbol propertieswww.mql5.com
Continue with the broader guides
Connect this reference to platform selection and the wider operating workflow.