BIT calculates the total USD collateral of a unified margin (UM) account based on currency haircut ratios*. The higher the haircut ratio of a currency, the lower the conversion rate of that currency as collateral.
* Which are measured against USD
Based on the risk profile of each currency, BIT classifies them into different tiers, click here for more information
Example:
Assuming that the assets of user A's account are as follows, and the BCH haircut ratio is 5%, then when the user's BCH equity is 100 and the USD index price is 300, the effective collateral value is 28,500 USD.
Currency  | Quantity/Equity  | Currency Haircut Ratio  | USD Index Price  | Discounted Collateral in USD  | 
BTC  | 3.136088934  | 0.02  | 37496.76318  | 115241.3204  | 
FLOKI  | 14000  | 1  | 0.000032118265  | 0  | 
IOTX  | 5  | 1  | 0.02507838032  | 0  | 
PEPE  | 100000  | 1  | 0.000001109749128  | 0  | 
RSS3  | 4  | 1  | 0.1497739099  | 0  | 
USDT  | 347974.9709  | 0.001  | 1.000296667  | 347730.1252  | 
Total: 462971.4456
The collateral calculation formula for UM is as follows:
3.136088934×37496.76318×(1−0.02)+34974.9709×1.000296667×(1−0.01)=462971.4456
The remaining haircut is valued at zero after a 10% discount.