How to use this calculator
- Enter initial quantity, final quantity, initial income, final income.
- 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
Elasticity=midpoint quantity change/midpoint income change.
Assumptions and limitations
Prices and preferences are assumed unchanged; this two-point association is not causal estimation.
Worked example
With initial quantity = 100, final quantity = 120, initial income = 1000, final income = 1100, midpoint income elasticity is approximately 1.9090909.
What the result means
Compare quantity sensitivity with an income change for a selected product.
Common questions
How should I interpret midpoint income elasticity?
Compare quantity sensitivity with an income change for a selected product.
What should I check before using this result?
Prices and preferences are assumed unchanged; this two-point association is not causal estimation.
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.