Suitability Table

Gravity	Temperature	Climate	Base Suitability	Colonial Administrator 20 Suitability
Heavy	Blistering	Gaseous	12%	24%
Heavy	Blistering	Noxious	18%	36%
Heavy	Blistering	Terran	25%	50%
Heavy	Frozen	Gaseous	18%	36%
Heavy	Frozen	Noxious	28%	56%
Heavy	Frozen	Terran	37%	74%
Heavy	Temperate	Gaseous	25%	50%
Heavy	Temperate	Noxious	37%	74%
Heavy	Temperate	Terran	50%	100%
Low	Blistering	Gaseous	18%	36%
Low	Blistering	Noxious	28%	56%
Low	Blistering	Terran	37%	74%
Low	Frozen	Gaseous	28%	56%
Low	Frozen	Noxious	42%	82%
Low	Frozen	Terran	56%	112%
Low	Temperate	Gaseous	37%	74%
Low	Temperate	Noxious	56%	112%
Low	Temperate	Terran	75%	125%
Normal	Blistering	Gaseous	25%	50%
Normal	Blistering	Noxious	37%	74%
Normal	Blistering	Terran	50%	100%
Normal	Frozen	Gaseous	37%	74%
Normal	Frozen	Noxious	56%	112%
Normal	Frozen	Terran	75%	125%
Normal	Temperate	Gaseous	50%	100%
Normal	Temperate	Noxious	75%	125%
Normal	Temperate	Terran	100%	125%

Multipliers

Above have been calculated as a multiplication of the following values (round down), which might be easier to remember than the list above.

Attribute / Multiplier	0.5	0.75	1.00
Gravity	Heavy	Low	Normal
Temperature	Blistering	Frozen	Temperate
Atmosphere	Gaseous	Noxious	Terran

CA 20 multiplies the result by 2 (round down).

Also see, Terraforming Project Blueprints.