Striped Marlin Weight Calculator

Estimate striped marlin round weight from lower jaw fork length, maximum girth, body depth, ocean basin profile, sex and maturity, body condition, measurement confidence, and unit system.

📌Striped marlin presets

⚙Basin, maturity, and measurements

Billfish model: this calculator uses lower jaw fork length as the length anchor, blends a striped-marlin length by girth-squared estimate with a depth cross-check, then adjusts for basin body line, sex and maturity, condition, and measurement confidence.

Ocean basin profile Basin changes the expected girth ratio, depth ratio, and fullness factor.

Sex and maturity Mature females often carry more body depth and girth at the same LJFL.

Lower jaw fork length (in) Measure straight from lower jaw tip to tail fork.

Maximum girth (in) Wrap the widest shoulder and belly section with a snug tape.

Body depth (in) Back-to-belly depth helps catch long, lean fish and heavy females.

Body condition Condition adjusts the weight after measured shape is checked.

Measurement confidence Confidence controls range width and profile blending.

Shape blend Use profile backup only when girth was estimated or the fish was moving.

Estimated striped marlin weight

The estimate combines lower jaw fork length, girth, body depth, basin profile, maturity, condition, and measurement confidence.

Estimated weight -- --

Plausible range -- --

Condition index -- --

Billfish class -- --

Calculation breakdown

📊Striped marlin body profile cards

Eastern Pacific

Girth ratio46%

Depth ratio24%

Best useBaitball and tailer fish

Central Pacific

Girth ratio45%

Depth ratio23%

Best useOpen-ocean lure fish

New Zealand

Girth ratio49%

Depth ratio26%

Best useDeep-bodied females

Confidence band

Measured7%

Partial16%

Photo30%

🐟Billfish comparison grid

Striped Marlin

Slender, high-speed billfish with moderate girth for length and strong regional body-line variation.

BuildSlim

Weight cueGirth

Blue Marlin

Much deeper and heavier at the same LJFL, especially in large mature females.

BuildDeep

Weight cueDepth

White Marlin

Smaller, light-framed billfish with a lower top-end weight and thinner shoulder line.

BuildLight

Weight cueLJFL

Sailfish

Long and blade-like with low body depth, so total appearance can overstate weight.

BuildBlade

Weight cueRatio

📘Reference tables

LJFL checkpoint	Typical girth	Typical depth	Estimated weight band
60 in / 152 cm	26-30 in / 66-76 cm	14-16 in / 36-41 cm	65-95 lb / 29-43 kg
72 in / 183 cm	32-36 in / 81-91 cm	17-19 in / 43-48 cm	105-145 lb / 48-66 kg
84 in / 213 cm	37-42 in / 94-107 cm	20-23 in / 51-58 cm	165-230 lb / 75-104 kg
96 in / 244 cm	43-48 in / 109-122 cm	23-26 in / 58-66 cm	250-340 lb / 113-154 kg
108 in / 274 cm	49-55 in / 124-140 cm	26-30 in / 66-76 cm	370-510 lb / 168-231 kg

Ocean basin profile	Multiplier	Expected shape	Calculator note
Eastern Pacific baitball fish	1.00	Balanced striped marlin line	Good baseline for Baja and Mexico fish
California Current traveler	0.98	Longer, leaner body	Use depth guard when photos look flat
Central Pacific lure fish	0.99	Lean offshore body	Moderate girth and narrow depth profile
South Pacific deep-body fish	1.02	Heavier shoulder and belly	Often benefits from measured body depth
Tasman or New Zealand fish	1.03	Deep mature frame	Large females can outpace LJFL-only math
Indian Ocean runner	0.98	Long, bright-water runner	Range widens if girth is estimated

Sex and maturity	Shape factor	Condition tendency	Best measurement priority
Juvenile or small fish	0.94	Narrow young frame	LJFL and girth are enough
Subadult unknown sex	0.98	Still adding shoulder mass	Girth is most important
Adult unknown sex	1.00	Neutral mature profile	Use all three measurements
Adult male	0.99	Often longer and leaner	Depth checks overestimates
Adult female	1.02	More depth and belly	Depth and girth together
Large mature female	1.04	Heavy frame potential	Measure depth carefully

Billfish comparison	Same 90 in LJFL cue	Body profile	Weight model note
Striped marlin	190-280 lb / 86-127 kg	Fast, slim, moderate depth	Girth matters more than length alone
Blue marlin	260-430 lb / 118-195 kg	Deep shoulder and belly	Depth can dominate on mature females
White marlin	75-130 lb / 34-59 kg	Light billfish frame	Use a separate species curve
Sailfish	55-110 lb / 25-50 kg	Long, blade-like body	Low depth keeps weight down

💡Measurement tips

Anchor everything to LJFL

Striped marlin weight charts are usually built around lower jaw fork length. If you only have total length, convert it before comparing fish or using the preset shape ratios.

Use depth to check girth

Two striped marlin can have the same LJFL and girth while carrying different depth. The depth cross-check keeps a long, flat fish from being scored like a deep mature female.

This is a field estimator for round whole striped marlin measurements and photo review. A calibrated scale is the final weight reference.

Estimating the weight of a striped marlin require several different measurement of the striped marlin to obtain an accurate estimate of its total weight. While it may be tempting to guess the weight of a striped marlin based off its length, the length of the striped marlin does not account for the girth or the body depth of the striped marlin. The girth and the body depth of a striped marlin are important measurements because the girth and the body depth of a striped marlin will help to determine the total weight of those fish.

Thus, to estimate the total weight of a striped marlin, you must measure the length, girth, and body depth of that fish to obtain an accurate estimate of its weight. The most common and standard measurement of striped marlin is referred to as the lower jaw fork length of the striped marlin. This measurement are taken from the lower jaw of the fish to the lower jaw of the opposing fish.

How to Estimate the Weight of a Striped Marlin

The reason that this is the standard measurement is that it will remain consistent even if the tail of the striped marlin is damage. However, the lower jaw fork length is not the only measurement that must be obtained. Along with the length measurement, you must also measure the girth and body depth of the striped marlin.

The girth of a striped marlin is the measurement of the distance around the widest part of the body of the striped marlin, while the body depth is the thickness of the striped marlin from the top of its head to its tail. Striped marlin with a larger girth or body depth will weigh more than striped marlin with small girth or body depth. Another factor that must be considered in the estimation of the striped marlins weight is the ocean basin in which that striped marlin was caught.

Striped marlin from different ocean basins may have different body shape and sizes. For instance, striped marlin from the Eastern Pacific Ocean have a balanced ratio of their girth to their length, while striped marlin from areas like New Zealand and the Tasman Sea have deeper bodies. Additionally, striped marlin from the Indian Ocean and the California Current have longer but narrow bodies, which may mean that the striped marlin from those areas may weigh less than striped marlin from other ocean.

By selecting the ocean basin of origin for the striped marlin in the calculator, the calculator will account for the expected girth and depth of striped marlin from that specific ocean basin. The maturity and sex of the striped marlin may also impact the total weight of the fish. Adult male striped marlin often grow to be longer and leaner than female striped marlin of the same age.

Additionally, large mature female striped marlin often have more depth to their belly than male striped marlin of the same age. Thus, when using the calculator, the user must account for the maturity of the striped marlin to reflect the differences in body shape between the two sex. Additionally, the condition of the striped marlin may also play a factor in the total weight of the striped marlin.

For example, striped marlin that contains more mass in its belly will be more heavier than striped marlin that does not contain as much mass in that area. Thus, striped marlin that is full of bait will weigh more than striped marlin that is lean. The calculator can account for the condition of the striped marlin.

Each measurement of striped marlin must be taken accurately for the weight to be accurate. For example, a striped marlin will weigh more if you measure it using a professional board and tape measure than if the measurement are taken from a photograph of the striped marlin. Additionally, using only a rough estimation of the girth or body depth of the striped marlin will result in a wider range of potential weight for that striped marlin.

A wider range of weights indicates that the weights were not measured as precisely as they could of been. Thus, using a wider range of weights is still useful information in that it indicates the striped marlins weight is not certain. Furthermore, the striped marlin may also be compared to other types of billfish to ensure that it is compared to the correct type of fish.

For instance, blue marlin are often heavier and deeper than striped marlin of the same length, while white marlin are lighter than striped marlin, and sailfish have thinner bodies than striped marlin. The comparison grid within the striped marlin weight estimating tool will help ensure that the striped marlin is compared to the other billfish species correct. Thus, the weight of striped marlin can only be as accurate as the measurements and settings used for the calculator; the user must make sure that the length, girth, and body depth are measured as accurately as possible.

Youll recieve a more moddern estimate if you follow these steps.