Identify the demand curve and supply curve
Find the market equilibrium price and quantity
Calculate consumer surplus as the area below the demand curve and above the equilibrium price, up to the equilibrium quantity
Calculate producer surplus as the area above the supply curve and below the equilibrium price, up to the equilibrium quantity
Add consumer surplus and producer surplus
Use the formula: Total Surplus = Consumer Surplus + Producer Surplus
For linear curves, compute each surplus as the area of a triangle or trapezoid if applicable
For discrete values, sum the differences between willingness to pay and price for buyers, and price and cost for sellers