The amount of matcha depends on whether you're making usucha (thin tea) or koicha (thick tea). For usucha, the most common preparation, use 1-2 grams (about 1/2 to 1 teaspoon) of matcha powder with 2-4 ounces of water.
Here's a breakdown by preference:
Traditional measurements use the bamboo scoop (chashaku), where two scoops equal approximately 1 gram. Beginners should start with less matcha and adjust to taste. High-quality ceremonial grade matcha requires less powder due to its concentrated flavor, while culinary grade may need more for the same intensity. Always sift the powder first to prevent clumps and ensure smooth consistency.