How to use the allometric scaling calculator
Estimate metabolic rate from body mass. Enter body mass in the field above; the basal metabolic rate, energy per day are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- M — Body mass (kg)
Worked example
With body mass = 70 kg, the calculator gives basal metabolic rate ≈ 82.28155 W; energy per day ≈ 1,699.122 kcal.
Frequently asked questions
What is the formula for the allometric scaling calculation?
Basal metabolic rate (W) = 3.4 × M^0.75. Energy per day (kcal) = [Basal metabolic rate] × 86400 / 4184. Here M is body mass (kg).
What inputs do I need for the allometric scaling (kleiber's law) calculator?
You need body mass in kg. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.