How spreads was calculated?
The calculation formula for spread is,
Spread= Ask Price − Bid Price
Bid Price: This is the highest price that a buyer is willing to pay for a specific product. If you are opening sell order, this is the price you would refer to; when closing the sell order, it would refer to the ask price.
Ask Price: This is the lowest price at which a seller is willing to sell their specific product. If you are opening buy order, this is the price you would refer to; when closing the buy order, it would refer to the bid price.