Find out exactly how much to feed your fish — works for koi, goldfish, tropical fish, cichlids, saltwater, and more
Where do you keep your fish?
🏠
Indoor Tank
🏊
Outdoor Pond
💡 About these calculations: Amounts are estimated from body weight (length³ × a body-shape factor, roughly 1–3% of body weight fed per day depending on species). Koi and pond fish use a chunky-bodied factor; other species use a lighter factor scaled to their typical build, since a slender tetra or a flat butterflyfish weighs much less than a koi of the same length — this is a reasonable approximation, not lab data, so individual fish will vary. The teaspoon/tablespoon/cup figure is also approximate, since dense sinking pellets can weigh 2-3x as much per teaspoon as light, fluffy flake food. Always observe your fish and adjust accordingly.