In an account with standard margin enabled, the margin requirements for each position are calculated separately. The margin requirements for all positions are then summed together to give the total margin requirements.
Deribit supports 2 standard margin models:
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Segregated Standard Margin (S:SM)
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Cross Standard Margin (X:SM)
The default margin mode for new accounts is segregated standard margin (S:SM).
As each position is looked at separately, the margin calculations for both S:SM and X:SM are relatively simple (though not very capital efficient in some cases). For each instrument, there is a simple formula for calculating the initial margin (IM) and maintenance margin (MM) requirements in a standard margin account. These formulas can be found in the Instrument Specifications section.