Fish Feeding Calculator

How this estimate works

There's no universal weight-based feeding chart that works across every species and food type, so this calculator gives a starting-point mass estimate scaled by fish size and count, meant to be tuned against the actual behavior of your fish rather than followed rigidly.

The two-minute rule

The most reliable feeding guide in the hobby is simple observation: offer a small amount and watch. If it's all eaten within about two minutes, that's roughly the right amount for that feeding. If food is drifting to the bottom uneaten after two minutes, you've offered too much — reduce it next time rather than continuing to feed the same amount.

Why overfeeding is the bigger risk

Uneaten food and excess waste break down into ammonia, which is toxic to fish and is the single most common cause of new-tank water quality crashes. It's much safer to feed slightly less than you think is needed and adjust up gradually than to overfeed and deal with the water-quality consequences. Many keepers also skip feeding one day a week, which mimics natural feeding patterns and gives the digestive system a rest.

Source: The "eaten within two minutes" benchmark is standard guidance used by professional aquarists and public aquarium keepers to judge feeding amounts without a universal weight chart.