How do I calculate the required margin for Gold, Silver, Platinum and Palladium trades?

Below are some examples explaining the formula for calculating the amount of margin required for trading precious metals:   Gold (USD) - XAUUSD Silver (USD) - XAGUSD Platinum (USD) - XPTUSD Palladium (USD) = XPDUSD Position Size: 1 Standard lot 1 Standard lot 1 Standard lot 1 Standard lot Account Leverage: 1:100 1:100 1:100 1:100 Price: $1,244.250 $15.835 $982.006 $596.601 Margin Required: 1% 1% 1% 1% Total ounces per contract: 100 100 100 100 Total exposure: = 15.853 * 5000 = $79,265.00 = 15.835 * 5000 = $79,175.00 = $982.006 * 100 = $98,200.60 = $596.601 * 100 = $59,660.10 Margin Requirement Calculation: = 1% * $124,425.00 = $1,244.25 = 1% * $79,265.00 = $791.75 = 1% * 98,200.60 = $982.01 = 1% * 59,660.10 = $596.60 Margin Requirement:  @ 1:400 leverage applied = $311.06 @ 1:400 leverage applied = 791.75 * 0.25 = $197.93 @ 1:400 leverage applied= 982.01 * 0.25 = $245.50 @ 1:400 leverage applied = 596.60 * 0.25 = $149.15