How to use this calculator
- Enter demand intercept price, market price, supply intercept price, market quantity.
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Linear surplus areas=½×quantity×vertical distance from market price to intercept.
Assumptions and limitations
Assumes linear demand/supply and the entered traded quantity; not a distributional or welfare assessment.
Worked example
With demand intercept price = 100, market price = 60, supply intercept price = 20, market quantity = 1000, consumer surplus is approximately 20000.
What the result means
Estimate triangular consumer and producer surplus under linear curves.
Common questions
How should I interpret consumer surplus?
Estimate triangular consumer and producer surplus under linear curves.
What should I check before using this result?
Assumes linear demand/supply and the entered traded quantity; not a distributional or welfare assessment.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.