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Calcimator

Fish Growth Projection

Project the number of days to reach market weight using the Thermal Growth Coefficient (TGC) model based on current weight, target weight, and water temperature.

Inputs

grams
grams
°F

Results

Days to Market Weight

95 days

Weeks to Market14 weeks
Months to Market3.2 months
Average Daily Growth5.79 g/day
Specific Growth Rate2.62 %/day
Total Weight Gain550 grams
Est. Feed Per Fish825 grams
Feed Conversion Ratio1.5
How to Use This Calculator
  1. Enter Current Fish Weight, Target Market Weight, and Water Temperature.
  2. Set Thermal Growth Coefficient.
  3. Review the Days to Market Weight (days) result.
  4. Use Weeks to Market (weeks) and Months to Market (months) to inform your decision.
  5. Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with Water Temperature

Water TemperatureDays to Market Weight
8297 days
16148 days
2595 days
3274 days

What each input means

Current Fish Weight
Average current weight per fish in grams.
Target Market Weight
Desired weight per fish at harvest in grams. 454 grams = 1 pound.
Water Temperature
Average water temperature in Celsius. Higher temps generally mean faster growth within species tolerance.
Thermal Growth Coefficient
Species-specific TGC. Typical values: tilapia ~2.5, trout ~1.5, catfish ~2.0, salmon ~1.8.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Current Fish Weight = 50, Target Market Weight = 600, Water Temperature = 25, Thermal Growth Coefficient = 2 = 4 input(s) provided
  2. Calculate Days to Market Weight
    95 = 95
  3. Calculate Weeks to Market
    14 = 14
  4. Calculate Months to Market
    Months to Market = round((roundedDays / 30) * 10) / 10
    3.2 = 3.2

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