Use this estimate when the species, measurement method, body-size range, and units match the relationship implemented by the tool. It is most useful for screening, normalization, or comparing repeated measurements made under the same protocol.

Body mass

Body mass in grams; must be greater than zero.

Intercept

Log-log intercept of the scaling line; defaults to -1.0.

Slope

Log-log slope of the scaling line; defaults to 0.75.

The implementation follows this calculation rule: Predict brain mass from body mass with the allometric power law predictedBrainMassG = 10^(intercept + slope x log10(bodyMassG)); defaults use intercept -1.0 g and slope 0.75 for the vertebrate brain-body scaling line.

Predicted brain mass

Predicted brain mass in grams.

Allometric and livestock equations are empirical relationships, not direct measurements. Breed, age, sex, condition, hydration, posture, and the population used to fit the coefficients can produce systematic error. Preserve the input values and units so the result can be audited and recalculated.

Prefer a calibrated scale or direct laboratory measurement when available. For longitudinal work, pair the estimate with condition score, age, and repeated measurements collected by the same operator.

• Kleiber BMR

  Estimate basal metabolic rate across animals with Kleiber's law: BMR = 70 x bodyMass^0.75 kilocalories per day.

• Dairy BCS Ratio Mapping

  Map a precomputed body-condition ratio onto a one-to-five score with round(ratio times five), clamped to the scale. This is a heuristic mapping, not a substitute for visual and palpation scoring.

• Brain-Body Ratio

  Compute the gross brain-body mass ratio as brain mass in grams divided by body mass in kilograms.