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Price Elasticity of Demand (Midpoint) — result sheet
Demand responsiveness free of start-point bias, with elastic/inelastic verdict.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: E = ((Q2-Q1)/Qavg) / ((P2-P1)/Pavg); |E|>1 elastic, =1 unitary, <1 inelastic.
Midpoint averages remove the direction bias of simple percent changes. The sign is normally negative (price up, quantity down); the verdict uses the absolute value.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Original price — minimum 1.0E-6; maximum 1000000000000
- New price — minimum 1.0E-6; maximum 1000000000000
- Original quantity — minimum 1.0E-6; maximum 1000000000000
- New quantity — minimum 0; maximum 1000000000000
Worked example
| Input | Value |
|---|---|
| Original price | 10 |
| New price | 12 |
| Original quantity | 100 |
| New quantity | 80 |
Elasticity -1.22 (|E| = 1.22, elastic).
Assumptions and limits
- Two observed points; other demand drivers held constant.
- All inputs positive except Q2 which may reach zero.
- A two-point estimate, not a full demand curve.
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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