Koi Feeding Calculator — Daily Amount by Temperature & Size | Pond Calculator
Free koi feeding calculator. Enter fish count, average length, and water temperature to get the exact daily feed amount and meal schedule.
How to Use the Koi Feeding Calculator
Enter fish count, average fish length, and current water temperature. Weight is estimated from length using the standard koi condition factor (K=1/1650≈0.000606), giving realistic values: 12 in → 1.05 lbs, 18 in → 3.53 lbs, 24 in → 8.38 lbs.
Feed rate is temperature-driven. Below 50°F (10°C), stop feeding entirely — koi digestion virtually stops and rotting food pollutes water. Optimal range is 68–74°F (20–23°C) at 2% body weight per day, 3 meals.
Above 82°F (28°C), reduce feeding to 0.5% — warm water holds less oxygen, and heavy feeding stresses fish. Always remove uneaten food after 5 minutes.
FAQ
How much should I feed my koi per day?
Feed 1.5–2% of total fish body weight per day during the optimal range of 68–74°F (20–23°C), split into 3 meals. At cooler temperatures (60–67°F), drop to 1% and 2 meals. Below 50°F (10°C), stop feeding entirely — koi digestion shuts down.
How do I estimate koi weight from length?
A common rule uses a condition factor: weight (lbs) ≈ length (inches)³ ÷ 1650 (K≈0.000606). This gives roughly 1.05 lbs for a 12" koi, 3.53 lbs for 18", and 8.38 lbs for 24". Well-fed koi with a higher condition factor may weigh more.
How many times a day should I feed koi?
At optimal temperatures (68–82°F / 20–28°C), feed 3 times per day. At 60–67°F (15–19°C), feed twice daily. Below 60°F (15°C), once per day is sufficient. Below 50°F (10°C), stop feeding completely until spring.
What happens if I overfeed koi?
Uneaten food decomposes and spikes ammonia and nitrite levels, stressing or killing fish. Overfeeding also contributes to algae blooms by adding excess nutrients. Always remove any uneaten food within 5 minutes of feeding.