What is a margin calculation formula of a stock CFD?

Margin required (USD) = (Units * Market Price) * (Margin Rate of 0.05)
Example (25 units Tesla)
Margin required (USD) = (Units * Market Price) * (Margin Rate of 0.05)
= (25 * 737.70) * 0.05
= 18,442.50 * 0.05
=  922.13 USD