What is producer surplus?

Producer surplus is the difference between the price a seller actually receives and the minimum price they would have accepted. Graphically it is the area above the supply curve and below the market price, which forms a triangle when supply is linear.

What is the supply curve intercept?

The intercept (also called the choke price or minimum supply price) is the price-axis value where the supply curve begins — the price at which quantity supplied equals zero. Below this price, producers supply nothing.

What is the supply curve slope?

The slope describes how the price must rise to induce producers to supply one more unit. A steeper slope means sellers require a larger price premium for additional output.

Why does the formula use 0.5?

With a linear supply curve, the surplus region is a right triangle. The area of a triangle is 0.5 × base × height, where base is the equilibrium quantity and height is the price difference (market price minus intercept).

What happens to producer surplus when the market price rises?

Producer surplus increases. A higher market price widens the triangle both vertically (larger price gap) and horizontally (larger equilibrium quantity), so surplus grows faster than the price increase.

Can I use this tool with a specific supply equation like Qs = 2P − 10?

Yes. Rearrange to P = 5 + 0.5Q. The intercept is 5 and the slope is 0.5. Enter those values along with the market price to get the result.

Producer Surplus Calculator

Enter the supply curve intercept, slope, and market price to calculate producer surplus — the area above the supply curve and below the market price.

Supply Function Parameters

Supply Intercept — a ($)

Minimum price at which producers supply any units (P = a + b·Q)

Supply Slope — b ($ per unit)

Price increase required per additional unit supplied

Market Price ($)

Prevailing price at which goods are sold

Quantity Override (optional)

Override equilibrium quantity if known (e.g. from a demand equation)

Supply Function Primer

P = a + b·Q Inverse supply: price as a function of quantity

Q* = (P − a) / b Equilibrium quantity at market price P

PS = ½ · Q* · (P − a) Area of the surplus triangle

Supply Curve Diagram

Enter values above to see the diagram.

Summary

Producer surplus is the monetary benefit sellers receive when the market price exceeds the minimum price they are willing to accept. For a linear supply curve, it equals the triangular area between the supply curve and the horizontal market price line — calculated as 0.5 × equilibrium quantity × (market price minus supply intercept). This tool derives the equilibrium quantity from your supply function and computes the surplus instantly.

How it works

Enter the supply curve price-intercept — the minimum price at which producers begin supplying any goods.
Enter the supply curve slope — how much the price rises per additional unit supplied.
Enter the market price — the prevailing price at which goods are sold.
The calculator derives equilibrium quantity using Q = (Market Price − Intercept) / Slope.
Producer surplus is computed as 0.5 × Quantity × (Market Price − Intercept).
A supply diagram with the shaded surplus triangle is drawn automatically.

Use cases

Economics students solving microeconomics homework problems.
Checking supply-side welfare calculations on exam questions.
Analyzing how a price increase raises producer surplus.
Comparing producer surplus across different supply curve configurations.
Illustrating the concept of seller benefit in classroom presentations.
Business analysts estimating value retained by sellers in a market.
Policy analysts evaluating the effect of price floors on producer welfare.

Frequently Asked Questions

Last updated: 2026-05-23 · Reviewed by Nham Vu