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Easily estimate fish weight using our online Fish Length Weight Calculator. Quick, accurate, and perfect for all anglers no scale needed!
Have you ever caught a fish and wondered how much it weighs without a scale? Our Fish Length Weight Calculator makes it super easy to find out the weight just by measuring its length. Whether you’re deep-sea fishing or enjoying a day at the lake, this tool helps you calculate the fish weight in pounds or kilograms instantly.
It’s perfect for saltwater fish, bonefish, catfish, and many other species. With our tool, you’ll never have to guess again. Just enter the fish's length, and get the approximate weight in seconds.
The fish length to weight formula is based on a scientific estimation used by anglers and biologists worldwide. It’s reliable for both freshwater and saltwater fish.
Here’s the general formula used:
Weight (lbs) = (Length × Girth × Girth) ÷ 800
Weight (kg) = (Length × Girth × Girth) ÷ 36,000
In some cases where girth isn’t available, a simplified version is used:
Weight (lbs) = Length³ ÷ 1,200
Weight (kg) = Length³ ÷ 27,000
These formulas offer a close estimate of the fish’s weight based on its size and shape. Keep in mind, the weight may vary slightly depending on the species and body condition of the fish.
Let’s say you caught a 20-inch fish and want to know its approximate weight.
Using the simplified formula:
Weight (lbs) = 20 × 20 × 20 ÷ 1,200 = 6.67 lbs
Weight (kg) = 20 × 20 × 20 ÷ 27,000 = 2.96 kg
Here are some more examples using estimated values:
This fish calculator app is also mobile-friendly and works perfectly in both online and offline fishing environments.
This calculator was specially built for anglers and fishing enthusiasts who need quick and accurate results. Whether you're targeting Bonefish, Mahi, Bluefish, or Catfish, our tool covers it all.
Not only does it help with fish weight conversion, but it also acts like a guide to understanding fish size charts, making it easier to keep records of your catches.
It’s also used in catch-and-release fishing, tournaments, and for educational or research purposes. You don’t need a scale to know your fish’s worth anymore just the length and a few seconds.
Our Fish Length Weight Calculator is your go-to tool for estimating fish weight in both pounds and kilograms. With a simple and user-friendly interface, you can calculate your catch’s size in seconds without needing any complex tools. From the Casual Angler to the Pro Fisherman, this tool is designed to serve everyone.
It's fast, accurate, and uses real-life formulas trusted by the fishing community. Whether you’re using it for fun or records, you’ll love how easy it makes the process.
You use a standard formula like Weight = (Length × Girth × Girth) ÷ 800 in pounds. If girth is unknown, you can use a simplified version like Length³ ÷ 1,200.
Roughly around 6.67 lbs, using the simplified fish length weight formula.
Depending on girth and body condition, it may weigh around 15 to 20 lbs.
A Mahi of this size could weigh between 25 to 35 lbs, depending on its build.
Yes, our Salt Water Fish Weight Calculator is ideal for saltwater species like Bonefish, Mahi, Bluefish, and more.
Yes! Our online tool is mobile-friendly and works like an app on any device. Just bookmark it and use it on the go.