Bass Fish Weight Estimator: Largemouth Bass Rob Neumann April 3rd, 2014 | More From Rob Neumann Share0 Tweet Email Share on Facebook.Share on Twitter.Share on Google+How much does your bass weigh? Several methods are available for estimating the weight of a fish based on length and girth measurements. Without girth measurements, however, weight can be estimated using only length from length-weight relationships. These formulas can be developed for a fish species in a water body, state, or region, or for a species in general. Species-specific length-weight formulas, called standard-weight equations, are used by fishery biologists to estimate body condition, or the relative weight or plumpness of a fish, compared to a standard weight for a fish of that length. These formulas are often created using thousands of fish from hundreds of populations across the range of the species, so they describe a general growth form of that species. Following are standard weights based on the formula for largemouth bass. The weights given are for fish in “above average” body condition. Fish weights are often variable for a given length, so you can make a judgment about how fat your fish is and make an adjustment. Length (inches) Weight (pounds) Length (inches) Weight (pounds) 12.0 0.88 21.5 5.94 12.5 1.01 22.0 6.41 13.0 1.15 22.5 6.90 13.5 1.30 23.0 7.41 14.0 1.46 23.5 7.95 14.5 1.64 24.0 8.52 15.0 1.83 24.5 9.11 15.5 2.04 25.0 9.74 16.0 2.26 25.5 10.39 16.5 2.50 26.0 11.07 17.0 2.76 26.5 11.78 17.5 3.03 27.0 12.53 18.0 3.32 27.5 13.30 18.5 3.63 28.0 14.11 19.0 3.97 28.5 14.95 19.5 4.32 29.0 15.83 20.0 4.69 29.5 16.74 20.5 5.09 30.0 17.69 21.0 5.50 relatedTop United States Record Largemouth BassRecord largemouth bass are an obsession for some, a passion for others, and a joy to behold for the masses. Defining tro... GALLERY: 10 Top Tricks For Largemouths 1 of 10 <h2>Feel The Power </h2>When hungry largemouths stalk shallow water with at least 2 feet of visibility, touring pro Keith Poche’s “Power Spinner” rig is hard to beat. The setup features a modified Senko-style stickbait decked out with a size 1 Colorado trailing spinner blade. Thread the hook halfway down the body, skin-hook it, then use a swivel, split ring, and Tru-Turn HitchHiker screw-in lock to secure the spinner blade to the tail end—but only after trimming off the last ¼-inch, so you have a blunt end to work with. The rig is versatile: Burn it just under the surface; swim it on a steady retrieve; or amp the animation with lifts, drops, and twitches. <h2>Feel The Power </h2>When hungry largemouths stalk shallow water with at least 2 feet of visibility, touring pro Keith Poche’s “Power Spinner” rig is hard to beat. The setup features a modified Senko-style stickbait decked out with a size 1 Colorado trailing spinner blade. Thread the hook halfway down the body, skin-hook it, then use a swivel, split ring, and Tru-Turn HitchHiker screw-in lock to secure the spinner blade to the tail end—but only after trimming off the last ¼-inch, so you have a blunt end to work with. The rig is versatile: Burn it just under the surface; swim it on a steady retrieve; or amp the animation with lifts, drops, and twitches. <h2>Dissect Docks </h2>Docks are largemouth magnets. Bass hold near or under these shoreline structures throughout the year, except when ice forms. Most bass fans know the ins and outs of fishing the shade on bright days, and targeting the windward side when waves are washing in, but deciphering the complexities of large docks is more of a mystery. Bass-holding sweet spots are often hidden beneath the dock, but topside clues such as lights and pole holders are a good sign the owners planted fish-attracting brush or Christmas trees below. Look for ropes hanging into the water, which may support the woody cover. Also keep in mind that many docks incorporate horizontal steel supports two to four feet beneath the surface, and bass often suspend by these. <h2>Find Rock Bottom </h2>Weedbeds and slop often hold bass, but don’t overlook isolated offshore rocks, which can hold beefy largemouths other anglers miss. Decorated bass pro Tommy Biffle uses sonar to quickly find hard bottom in depths of 10 feet to 20 or more, then swims, bangs and drags his trademark Biffle Bug over the top of it. <h2>Hide Your Line </h2>When a superbraid’s camo fades to milky white or other garish hues, the ultra-strong string becomes easier for skittish bass to spot. A braid’s superpowers last long after its color fades, so tossing it would be a waste. Rather than respool, Scott Bonnema runs a dark magic marker along the last two to three feet to restore the line’s stealth factor, without wasting an inch of it. <h2>Hit The Road </h2>Sunken roadbeds are largemouth superhighways on manmade impoundments—even when flooded timber and other fishy-looking cover and structure abound. Veteran bass guide Dave Parsons of Yantis, Texas, calls legendary Lake Fork his home waters. And despite the reservoir’s sunken forests, he often relies on roads to put bass in the boat. One of his favorite setups includes watching for bass busting shad on the surface, above an underwater roadway. Topwater baits catch their share of these schoolies, and after the surface frenzy subsides, Parsons mops up bottom-huggers with a diving crank or soft-plastic presentation. <h2>Rule The Slop </h2>Hollow-bodied frogs rock when bass sit tight beneath skinny-water slop, but there’s more to the game than frantically flogging the greenery. Take a cue from veteran pro Scott Bonnema, who deploys a shallow-water anchor to position his boat a long cast from the fish, then shuts down his electronics and slips into stealth mode. Firing long casts, he keeps the frog hopping—skittering it non-stop across the surface. Rod position is key: Keep your tip up, and shake it to give the frog a walking motion. When a bass blows up on the bait, drop the rodtip before setting the hook. This gives the fish time to turn with the frog, and boosts your odds of a solid set. When a bass misses the mark, Bonnema throws a “backup punch”—quickly flipping a ½- to ¾-ounce Terminator jig, tipped with a 4-inch Trigger X Flappin’ Craw, to the scene of the eruption. More times than not, a speedy follow-up results in a strike. <h2>Simplify Color Selection </h2>Bass anglers have an amazing palette of patterns with which to paint our presentations. But sometimes deciding between Cooter Brown, Tennessee Shad, Foxy Momma, and a host of other promising choices can be more intimidating than picking out an outfit to wear at a fishing buddy’s wedding. To speed the process, Hall of Fame guide Dick “the Griz” Grzywinski keeps it simple, starting his color experimentations with shades of gold and silver, with a dash of red for good measure, then expands from there when the bass show a preference. Fellow guide Billy Rosner adheres to the mantra, “bright day, bright lure; dark day, dark lure.” Developing similar simple strategies for your favorite lakes, or similar conditions on different lakes, can turn the task of color selection from a chore to a cinch. <h2>Smoke A J </h2>A J-Rig that is, courtesy of bassin’ phenom Janet Parker. Her super-modified, near-weightless wacky system shines when largemouths dictate an easy-to-control, horizontal-falling softbait. Here’s how she does it: Tie a 2/0 Owner Mosquito Hook on a 2- to 5-foot, 10- to 20-pound fluorocarbon leader, then wrap the hook with 1 to 1½ inches of golfer’s tape. Thread on a soft stickbait so the barb is covered but close to the surface. Fish the rig on a slack line, with your bail open. The weight makes the worm wiggle on the fall. If the line jumps or moves off, raise the rod; the hook practically sets itself. <h2>Stay Current </h2>Rivers, streams, and adjoining backwaters offer some of the continent’s finest and most overlooked largemouth fishing. The key is finding cover without heavy current, which often guides anglers into backwaters. Given sufficient oxygen, such areas can hold bass. But one often-ignored main-river hotspot, especially in times of modest to low flows, is a logjam on the upstream side of an island. Largemouths tuck tight to the wood, particularly along current seams. To fish such a spot, position your boat downstream in the side channel and cast a jig upstream, then retrieve it quickly through the logs and limbs. <h2>Throw A Deep Punch </h2>When legions of anglers pummel shoreline weeds, Minnesota bassin’ aces Daniel Larson and Gary Rehbein go deep. The hard-fishing team—who used this tactic to score a $10,000 Cabela’s NABC win on Gull Lake in In-Fisherman’s backyard—looks for offshore weedbeds, then zeroes in on the intersection of coontail and cabbage. They don’t mess with the canopy, instead punching ¾-ounce Booyah jigs tipped with Yum Money Craws through the jungle and into the foot or two of freeboard along bottom. To thoroughly work prime lies, they dissect the cover in a grid pattern. The trick is making a short pitch, letting the jig fall to bottom, giving it a lift and shake or two, then reeling in and moving on until you connect. 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