Compute the margin ratio from account equity and position market value.
输入账户权益与持仓市值,求保证金比例。
| Item | Formula / Rule | Source / Standard |
|---|---|---|
| Margin ratio | Margin ratio = account equity / position market value, the own-funds share under leverage | SEC Regulation T, 12 CFR 220 |
| Initial margin | Regulation T sets initial margin at 50 percent, allowing borrowing of up to half the position value | SEC Regulation T, 12 CFR 220 |
| Maintenance margin | FINRA maintenance margin is 25 percent; falling below it triggers a margin call | FINRA Rule 4210 |