About 1% is raw ginger root. Nearer to 2% in ground ginger
A one inch piece of fresh, grated ginger (generally yielding 1 tablespoon) equals approximately 1/8 teaspoon ground (dried) ginger. Source: http://www.evitamins.com/healthnotes.asp?ContentID=3602003
For the best flavor and health benefits, it is recommended to add about 1-2 teaspoons of fresh grated ginger to a cup of tea.
Dry is always more potent, as long as your spices are not old. If you have "fresh" dry ginger, 1 teaspoon would be the right amount to substitute for 2 tablespoons of fresh ginger. Since ginger is something that loses its potency in dry form very quickly, the best possible answer to this question is "to taste."
As a general guideline, you can use 1/4 teaspoon of dried ginger for every 1 tablespoon of fresh ginger in a recipe. Adjust to taste based on your preference for ginger flavor.
1 inch of ginger grated will produce about 4 teaspoons.
To substitute fresh ginger with ground ginger in a recipe, use 1/4 teaspoon of ground ginger for every 1 tablespoon of fresh ginger called for in the recipe. Adjust the amount to taste, as ground ginger is more concentrated than fresh ginger.
When all else fails, go to "Joy of Cooking" --see "equivalents and or substitutions, and I quote: 1 Tsp raw ginger = 1/8 tsp pwd. This info is usually on the spice container, but I use a less expensive brand and it does not have the info. cmg
On average, one centimeter of fresh ginger root weighs about 1 gram. Keep in mind that the weight can vary depending on the thickness and density of the ginger piece.
Well, 1/4 cup dehydrated onion equals 1 full cup of fresh onion, so a half cup of fresh onion would then be 1/8 cup of dehydrated onion. That's the same as 1 and 1/2 Tbsp.
2 Tbsp dried cilantro = 1/4 cup fresh cilantro
Typically, 1 teaspoon of ginger paste is equivalent to approximately 1/2 inch of fresh ginger. However, this can vary depending on the brand and concentration of the paste. It's always best to refer to the specific instructions on the packaging or adjust to taste when substituting ginger paste for fresh ginger in recipes.
Use 1/3 or 1/2 of the fresh amount. So, if the recipe calls for 1 teaspoon fresh cilantro, you use 1/3 or 1/2 teaspoon of dried.