How this calculation works
Measure percentage quantity response to a small percentage price change.
THE FORMULA
Elasticity = (dQ/dP) × P/QA worked example
At P=10 and Q=50 with slope −5, signed elasticity is −1.
Good to know
This is local elasticity at one operating point.
Reference: OpenStax Calculus Volume 3 (opens in a new tab) ↗
Read the result
Measure percentage quantity response to a small percentage price change.
The primary result is labeled “Signed elasticity”. Keep the input definitions in view when comparing this result with another method.
Try a related calculation
This is local elasticity at one operating point.
For a related exercise, try the quadratic equation solver.
A few questions, answered
How can I check the default inputs by hand?
At P=10 and Q=50 with slope −5, signed elasticity is −1.
Which rule does this calculator apply?
Elasticity = (dQ/dP) × P/Q