1. What is the Fish Weight Formula?

The fish weight formula estimates a fish's weight using its girth and length measurements when you don't have access to a scale. This is particularly useful for catch-and-release fishing.

2. How Does the Calculator Work?

The calculator uses the fish weight formula:

Where:

• \( Girth \) — The circumference around the fish's thickest part (inches)
• \( Length \) — The length from nose to tail (inches)
• 800 — Standard divisor for freshwater fish (varies by species)

Explanation: The formula approximates the fish's volume and converts it to weight, assuming a typical fish body shape and density.

3. Importance of Weight Estimation

Details: Accurate weight estimation helps anglers track their catches without harming the fish, important for conservation and personal records.

4. Using the Calculator

Tips: Measure girth at the fish's thickest part and length from tip to tail in inches. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this formula?
A: It's reasonably accurate for most common game fish, though actual weight can vary ±10% depending on species and condition.

Q2: Does this work for saltwater fish?
A: Yes, but the divisor may need adjustment (typically 750-850 depending on species body shape).

Q3: What's the best way to measure girth?
A: Use a flexible tape measure around the fish's thickest part, usually near the dorsal fin.

Q4: Are there species-specific formulas?
A: Yes, some species like bass or trout have slightly modified formulas for better accuracy.

Q5: Can I use centimeters instead of inches?
A: Yes, but you'll need to use a different divisor (approximately 30000 when using cm).