Trout Weight Calculator

Estimated Weight (lbs):



Calculating the weight of a trout is essential for anglers who want to keep track of their catch. To simplify this process, we’ll create a Trout Weight Calculator using HTML code. This tool will require you to input the length (in inches) and girth (in inches) of the fish, and it will provide the estimated weight in pounds using a specific formula. In this guide, we’ll walk you through how to use this calculator, provide the formula for weight calculation, offer an example to solve, address some frequently asked questions, and conclude with the complete HTML code.

How to Use the Trout Weight Calculator

  1. Create an HTML form with fields for Length (inches) and Girth (inches).
  2. Implement JavaScript to calculate the weight using the formula: W = (L^3 * G) / 800, where W is the weight, L is the length, and G is the girth.
  3. Add a button to trigger the calculation.
  4. Display the calculated weight.


The formula to calculate the weight of a trout is:

Weight (W) = (Length (L) ^ 3 * Girth (G)) / 800


Let’s say the length of the trout is 16 inches, and the girth is 10 inches. To calculate the weight:

W = (16^3 * 10) / 800 W = (4096 * 10) / 800 W = 40960 / 800 W = 51.2 lbs

So, the estimated weight of the trout is 51.2 pounds.

Frequently Asked Questions (FAQs)

Q1: Is this formula accurate for all trout species?

A1: The formula can provide a reasonably accurate estimate for many trout species, but it may not be precise for all. Trout species can vary, so consider it a rough estimate.

Q2: Can I use this calculator for other fish species?

A2: The formula and calculator are designed for trout. It may not provide accurate results for other fish species due to variations in body shape.

Q3: How can I make the button clickable to calculate the weight?

A3: You can use JavaScript to add an event listener to the button that triggers the weight calculation when clicked.

Q4: Are there any size limitations for using this calculator?

A4: There are no strict size limitations, but extremely small or large fish may not provide accurate results.


Creating an HTML Trout Weight Calculator can be a useful tool for anglers to estimate the weight of their catch. By following the provided instructions, implementing the formula, and using JavaScript, you can easily calculate the weight of a trout based on its length and girth. Remember that this is a rough estimate and may not be accurate for all trout species or extreme sizes. Happy fishing!

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