Dried and milled ginger root. Drying converts much of the pungent gingerol into zingerone and shogaols, which is why it tastes warm and sweet rather than sharp and fiery.
What it does in a recipe: A warm baking spice and a dry-rub component — chemically a different ingredient from fresh ginger, not simply a concentrated version of it. Pick the swap that covers that job — the ratios below are written so you can act on them without doing any arithmetic.
Ginger is roughly a quarter of the blend, so twice the volume gets you about half the ginger plus the cinnamon and nutmeg that usually accompany it in a recipe anyway.
Trade-offHeavily cinnamon-led. Works in a pumpkin loaf, wrong in anything meant to taste specifically of ginger.
Allergen checkBecause this is a blend rather than a single spice, its non-spice ingredients depend on the brand and may include wheat derivatives. Look at the label if you bake gluten-free, and check with the manufacturer where an allergy is severe.
Ground cardamom
In a pinch
1 tsp ground ginger = 1/2 tsp ground cardamom
Cardamom is ginger's close botanical relative and shares some of its warm, resinous character, but it is much more aromatic and needs halving.
Trade-offDistinctly floral and eucalyptus-like. It changes the identity of a spiced cake rather than filling a gap in it.
Cooking around an allergy? Diet tags here describe the ingredient itself, not any particular brand. Processed products change formulation without notice and shared production lines are common, so read the label on everything you use. A severe allergy is a medical matter — confirm with the manufacturer or your clinician rather than relying on a substitution chart.