Producer Surplus Calculator

What Is Producer Surplus? Producer surplus is the benefit producers receive when they sell at a market price higher than the minimum price they were willing to accept. It is the seller-side counterpart to consumer surplus.

The Triangle Formula (Linear Supply) For a linear supply curve, producer surplus forms a triangle below the market price and above the supply curve:

PS = ½ × Q × (P_market − P_min)

Where:

• P_min = minimum price at which producers will supply (supply curve’s price intercept)
• P_market = actual market price
• Q = quantity supplied at the market price
• The factor ½ applies because the surplus area is a right triangle

Relationship Between PS and Profit Producer surplus is closely related to profit, but they are not identical:

• Profit = Revenue − Total Cost (including fixed costs)
• Producer Surplus = Revenue − Variable Cost

Producer surplus equals profit plus fixed costs. In the long run, when fixed costs are zero, PS equals economic profit.

Graphical Intuition On a price-quantity graph, the supply curve slopes upward from P_min. The market price is a horizontal line above P_min. Producer surplus is the triangular area between the market price line (above) and the supply curve (below), from zero to the equilibrium quantity.

Total Economic Welfare Total Welfare = Consumer Surplus + Producer Surplus

This represents the total value created by all trades in a market. A competitive equilibrium maximizes this total welfare.

Government Interventions Price ceilings (maximum prices) reduce producer surplus. Price floors (minimum prices) reduce consumer surplus. Both create deadweight loss — trades that would have created value but no longer occur.

Price Subsidies A government subsidy to producers shifts the supply curve down, lowering market price and increasing both quantity sold and producer surplus (though at public cost).