Price Elasticity of Demand Calculator

Price elasticity of demand is the percentage change in quantity sold divided by the percentage change in price. Enter the price and the quantity before and after the change and this returns the elasticity by the midpoint method or from the starting values, says whether demand is elastic or inelastic, and shows what total revenue did. A third mode runs it the other way, taking an elasticity you already have and projecting the quantity and revenue at a new price. Two observations describe the stretch of demand curve between them and not the whole of it.

Calculator Type

Divides by the average of the before and after readings, so the answer is the same whichever end you start from. This is the form most courses ask for.

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Divides by the before readings, the way a plain percentage change is taken. The answer depends on which reading you call the start.

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Turns an elasticity the other way round: given one, this is the quantity and the revenue a new price would bring.

Normally negative. A positive entry is read as the same size with the usual negative sign.
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