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Consumer Surplus Triangle Calculator — result sheet
Estimate consumer surplus from a maximum willingness to pay, market price, and purchased quantity under a straight-line demand model.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Consumer surplus = ½ × (maximum willingness to pay − market price) × quantity purchased.
Consumer surplus describes the difference between what buyers would have been willing to pay and what they pay, represented here by the area of a triangle. The calculator makes the straight-line demand assumption visible instead of pretending that every market has the same curve.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Maximum willingness to pay at zero quantity — currency/unit; minimum 0; maximum 1000000000000
- Market price per unit — currency/unit; minimum 0; maximum 1000000000000
- Quantity purchased — units; minimum 0; maximum 1000000000000
Worked example
| Input | Value |
|---|---|
| Maximum willingness to pay at zero quantity | 100 |
| Market price per unit | 60 |
| Quantity purchased | 100 |
Consumer surplus is 2,000 currency units, with an average surplus of 20 per purchased unit.
Assumptions and limits
- The demand curve is represented by a straight line between the stated intercept and the entered market point.
- Willingness to pay and market price use the same currency per unit and quantity is nonnegative.
- The result is a modelled area and does not measure individual utility, producer surplus, taxes, externalities, or social welfare.
- Market price cannot exceed the entered maximum willingness to pay in this triangular model.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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