Identify your recipe goal: match the green color (pick spinach/wheatgrass), keep an algae-like flavor (pick chlorella), or maintain a more familiar taste (pick matcha).
Use the ratio listed in the table; if your substitute seems milder or less colored, scale up gradually rather than doubling at once.
For thicker batters/smoothies, whisk the powder into the liquid first (or blend) to prevent clumps.
Taste and adjust: if it tastes too grassy, reduce the swap and add a neutralizing element (cocoa/vanilla/lemon).
If baking, consider lowering bake time slightly or add the powder to wet ingredients so color stays more even.