How to use this calculator
- Enter initial quantity of product a, final quantity of a, initial price of product b, final price of b.
- 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
Assumptions and limitations
Two observations do not establish substitution or causality; other demand conditions are assumed unchanged.
Worked example
With initial quantity of product a = 100, final quantity of a = 110, initial price of product b = 10, final price of b = 12, midpoint cross-price elasticity is approximately 0.52380952.
What the result means
Inspect association between one product’s quantity and another product’s price.
Common questions
How should I interpret midpoint cross-price elasticity?
Inspect association between one product’s quantity and another product’s price.
What should I check before using this result?
Two observations do not establish substitution or causality; other demand conditions are assumed unchanged.
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.