1. A method performed by a computer system for recommending a design point for an integrated circuit design, the method comprising: receiving an integrated circuit design, the integrated circuit design comprising a plurality of circuit components; receiving a reference PPA (power, performance, area) metric for the integrated circuit design evaluated at a reference design point; receiving a target PPA metric for the integrated circuit design; estimating trial PPA metrics for the integrated circuit design evaluated at a plurality of trial design points within a design space, wherein for each trial design point the estimating comprises: accessing a PPA database that contains PPA metrics for multiple test components evaluated at multiple design points; determining, by the computer system, scale factors for the circuit components in the integrated circuit design, the scale factors based on: scaling from (a) the reference design point to (b) the trial design point, of equivalent test components to the circuit components; and applying the scale factors to the reference PPA metric to determine the trial PPA metric at the trial design point; and based on the estimated trial PPA metrics and the target PPA metric, recommending a trial design point for the integrated circuit design, wherein the integrated circuit design is providable for subsequent design and manufacturing of the integrated circuit.