Pick your fertilizer, your watering can, and how strong to feed. We'll tell you how many teaspoons (and grams) to add, and what that dose actually delivers. Feeding through a siphon mixer or injector instead? Flip the mode and we'll size the concentrate for your ratio.
Your Fertilizer
How You Feed
Your Container
Feeding Strength
Your Dose
Spoon and cup estimates assume a typical water-soluble powder (about 5 g per level teaspoon); a cheap gram scale is more accurate. Bag rates for outdoor in-ground gardens often run stronger than these container-friendly strengths. For liquid fertilizers, follow the label.
Running a fertigation system? The Fertigation Calculator targets exact ppm across multiple products, concentrate tanks, and pH acid dosing.