Compute consumer surplus from a linear demand curve and a market price.
Please do not make financial decisions based on these results.
What is the Consumer Surplus Calculator?
Compute consumer surplus from a linear demand curve and a market price. To use the Consumer Surplus Calculator, enter maximum willingness to pay, market price, quantity bought; it returns consumer surplus, and shows them instantly as you type.
Where the Consumer Surplus Calculator fits
Compute consumer surplus from a linear demand curve and a market price. The main figure it returns is the Consumer surplus, worked out from the values you enter.
It belongs with the other accounting & microeconomics tools. If you are comparing options or checking a result from another angle, try the Optimal Price Calculator, Income Elasticity of Demand Calculator or the Revenue Calculator.
How to use the Consumer Surplus Calculator
- Enter your numbers. The inputs are Maximum willingness to pay ($), Market price ($), Quantity bought. Use numbers from the same accounting period so the ratios are comparable. Fields marked optional can stay at zero.
- Read the result. The highlighted box gives the Consumer surplus. Tables and charts break it down further.
- Test other scenarios. Results update as you type. Change one value at a time to see what drives the answer, and press Reset to go back to the defaults.
Formula and how it works
Example with real numbers
Here is the Consumer Surplus Calculator using the default values shown in the calculator above:
Inputs
| Maximum willingness to pay ($) | 100 |
|---|---|
| Market price ($) | 60 |
| Quantity bought | 200 |
Results
| Consumer surplus | $4,000.00 |
|---|
With these inputs the calculator returns Consumer surplus: $4,000.00. Change any value in the calculator to see how the result moves.
What if you change one input?
Sensitivity check: raising Maximum willingness to pay ($) from 100 to 120 (about 20% higher) and leaving everything else as in the example above changes the results like this:
| Result | Example | After the change | Change |
|---|---|---|---|
| Consumer surplus | $4,000.00 | $6,000.00 | +50% |
The input that moves the result most is the one to check twice. Change it in the calculator above to test your own case.
Method and limits. This calculator applies the formula in the section above to your inputs, in your browser; nothing you enter is stored on our servers. The result is only as accurate as the numbers you enter and the formula shown above. It is for information, not financial, tax or legal advice.
Frequently asked questions
What is consumer surplus?
The gap between what buyers are willing to pay and what they actually pay.
Why use average balances?
Ratios that compare a flow (sales, income) with a balance (assets, equity) are fairer when the balance is averaged over the period.
What is the cash conversion cycle?
It is DIO plus DSO minus DPO: the days between paying suppliers and collecting from customers.
Are the results guaranteed?
No. Results depend entirely on the numbers you enter and the formulas shown on this page. Please do not make financial decisions based on them alone; confirm important figures with a licensed professional.
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