Give link for calculate magin for interday trading and trading for 2-3 days carryford equity

For F&O, use this one

https://zerodha.com/margin-calculator/SPAN/

For equity use this

https://zerodha.com/margin-calculator/Equity/

For higher leverage cover orders/bracket orders, use this

https://zerodha.com/margin-calculator/BracketCover/