What this calculator measures
Estimate midpoint price elasticity from two prices and two quantity levels.
The midpoint method reduces dependence on which observation is treated as the starting point. Enter values from the same reporting period and retain the source data so the result can be reproduced.
Common use cases
Use this model when the inputs describe the same decision, period and customer or product scope.
- Estimate midpoint price elasticity from two prices and two quantity levels.
- Use the result with the recorded inputs: Original price, New price, Original quantity, New quantity.
- Compare multiple scenarios before making a business decision.
Formula
The midpoint method reduces dependence on which observation is treated as the starting point.
Price Elasticity: formula, inputs and interpretation
The midpoint method reduces dependence on which observation is treated as the starting point.
Formula
Example input values
Worked calculation and answer
A price move from $50 to $55 with quantity moving from 1,000 to 880 produces elasticity of about −1.34.
Variable definitions and checks
- Original price (p1): Use a numeric value at least 0. Check its reporting period and definition before comparing it with other inputs.
- New price (p2): Use a numeric value at least 0. Check its reporting period and definition before comparing it with other inputs.
- Original quantity (q1): Use a numeric value at least 0. Check its reporting period and definition before comparing it with other inputs.
- New quantity (q2): Use a numeric value at least 0. Check its reporting period and definition before comparing it with other inputs.
When the result may mislead
The calculation reflects the variables named above, not unentered taxes, platform terms, reporting delays, financing charges or external forecasts. For comparisons, keep the same units and reporting period and change one assumption at a time.
How to interpret the result
Treat the estimate as local to the observed price range; seasonality and promotions can distort it.
Use the result as a decision aid rather than a standalone conclusion. Compare trends and scenarios using unchanged definitions.
Assumptions and limitations
- Inputs use compatible periods and definitions.
- Amounts are entered before rounding unless stated otherwise.
- The model excludes fields not shown in the calculator.
- Material accounting, tax, legal, and investment decisions require independent verification.
Frequently asked questions
What does Price Elasticity measure?
The midpoint method reduces dependence on which observation is treated as the starting point.
How should I compare results?
Use the same definitions, currency, period, and data source for every comparison.
Is this result a forecast?
No. It is a deterministic estimate based only on the values entered and does not predict future conditions.