Table 1 Results obtained by applying our workflow to the Materials Project database.

Symmetry	Structures^†	∼67,000
	Polar structures^†	∼15,000
	Distinct polar formula^†	∼10,000
	Nonpolar-polar structure pairs	∼17,000
	Structure pairs with distinct chemical formulae	∼1,600
	Pairs with continuous transformation	413
DFT	Pairs with metallic endpoints	80
	Pairs with metallic interpolations	59
	Pairs with calculation errors	19
	Pairs that completed successfully	255
Valid	High-quality ferroelectric candidates	200
	Known ferroelectrics in high-quality candidates	74
	New ferroelectrics in high-quality candidates	126

The symbol ^† indicates “in Materials Project database at time of search”. Boxes relate numbers by symmetry conditions (Symmetry), first-principles calculations (DFT), and validation processes (Valid.). “Nonpolar-polar structure pairs” satisfy simple group-subgroup relations while “pairs with continuous transformation” satisfy group-isotropy subgroup relations.

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