Ước tính Cá Khối lượng from Chiều dài (W = aL^b)

Ước tính khối lượng from cá chiều dài and coefficients a and b, then keep the kết quả, error khoảng, saved coefficient sets, and có thể chia sẻ JSON in one workflow.

The page makes TL / FL / SL assumptions explicit and supports quick estimates, coefficient fitting, and batch processing without leaving the trình duyệt.

Chiều dài đầu vào in cm or inches, khối lượng đầu ra in g, kg, oz, or lb Tham khảo mẫu có sẵn, trình duyệt lưu, and JSON sharing Solve for a from one mẫu or fit a and b from nhiều mẫu Batch phép tính and Xuất CSV for many cá

What this công cụ covers

Enter species, chiều dài, chiều dài type, and coefficients a and b to tính ước tính khối lượng and a practical error khoảng immediately.
Start from FishBase-based tham khảo mẫu có sẵn, then replace them with your own thực địa or factory coefficients and reuse them later.
Tải xuống coefficient sets as JSON, nhập them again, or create a có thể chia sẻ URL with the hiện tại state.
When coefficients are unknown, derive them from a single mẫu or from nhiều measured pairs.
The page is prepared for Japanese and English sử dụng and for đơn vị switching in international workflows.

Cách to sử dụng

  1. Enter the species name, chiều dài, đơn vị, and chiều dài type, then choose a tham khảo mẫu có sẵn or enter coefficients a and b directly.
  2. Adjust the error percentage to update the ước tính khối lượng and khoảng on the right in real thời gian.
  3. Once the coefficients are settled, lưu them with a name and ghi chú or xuất them as JSON.
  4. Sử dụng the coefficient fitting tab when you do not know the coefficients yet, and the batch tab when you need kết quả for many measurements.

Examples

Estimate from a reference preset

Input

Species: Japanese jack mackerel, length: 35 cm, length type: TL, a=0.01096, b=2.97, error: ±20%

Output

Estimated weight: about 421 g, range: about 337 g to 505 g

Solve for a from one sample

Input

Length: 35 cm, observed weight: 432 g, assumed b: 3.0

Output

a = 0.01008, formula: W(g) = 0.01008 × L(cm)^3.0

Batch calculation

Input

Run 25 cm, 30 cm, and 35 cm with the same coefficient set

Output

List estimated weight, low range, and high range for each row and export the table as CSV

Reference presets

Built-in presets are reference values only. Check the source label and length-type assumption in the result panel, and replace them with measured operating values whenever possible.

Japanese jack mackerel: a=0.01096, b=2.97, TL, based on cm/g. FishBase reference value.
Chub mackerel: a=0.00741, b=3.05, TL, based on cm/g. FishBase reference value.
Olive flounder: a=0.00794, b=3.07, TL, based on cm/g. FishBase reference value.
Japanese seabass: a=0.01259, b=3.02, TL, based on cm/g. FishBase reference value.
Red seabream: a=0.01288, b=3.03, TL, based on cm/g. FishBase reference value.
Blackhead seabream: a=0.02138, b=2.99, TL, based on cm/g. FishBase reference value.

Thuật ngữ

TL / FL / SL

Total length, fork length, and standard length. The coefficient set is only valid when the same length definition is used.

Coefficients a and b

The values that define the relationship W = aL^b. They vary by species, region, season, and stock condition.

Error range

The working range around the estimate. Adjust it to reflect regional differences, maturity, and body condition.

Reference coefficient

A coefficient set taken from published or public reference data. Validate it before operational use.

Fitted coefficient

A coefficient set derived from your own measured fish, either by back-solving or by regression.

Công thức

  • Estimated weight W(g) = a × L(cm)^b
  • Lower bound = W × (1 - error% / 100)
  • Upper bound = W × (1 + error% / 100)
  • Single-sample solve: a = W / L^b
  • Multi-sample fit: log(W) = log(a) + b log(L)

Câu hỏi thường gặp

Tôi không biết a và b. Tôi nên làm gì?

Sử dụng the coefficient fitting tab. You can solve for a from one measured mẫu, or fit both a and b from nhiều chiều dài-khối lượng pairs.

Can I tính many cá at once?

Có. The batch tab accepts table entry and CSV-style paste, and the kết quả can be downloaded as CSV.

Tôi có thể chuyển giữa cm và inches, hoặc g và lb không?

Có. Đầu vào and đầu ra đơn vị can be changed at any thời gian. Internal calculations always sử dụng cm and g.

Why can the ước tính be far from the thực tế khối lượng?

Cá of the same species still vary by region, season, maturity, fatness, and measurement method. Sử dụng the ước tính as a khoảng, not as a guaranteed exact value.

Các hệ số đã lưu được lưu ở đâu?

Without login support, saved sets trực tiếp in this trình duyệt's localStorage. Keep a JSON xuất if you need a portable sao chép.

Có dữ liệu nào được gửi lên máy chủ không?

Không. Phép tính, lưu, and JSON generation all stay inside the trình duyệt.

Quan trọng ghi chú

  • This ước tính is only a hướng dẫn. Region, season, maturity, body condition, and measurement method can change the kết quả substantially.
  • Always sử dụng coefficients with the same chiều dài type and đơn vị assumption. The internal base is cm and g.
  • Tham khảo mẫu có sẵn are not operating values. Sử dụng measured data to build your own sets whenever possible.