Biology Calculators
Calculation involving biology, plants and animals
Botany
Bulb Spacing CalculatorBotanyWork out how many flower bulbs a bed needs from its size, the bulb you are planting and the pattern you want, with an exact row by row layout for rectangular beds, area based estimates for circles, triangles and ovals, planting density, depth and order quantity.
Basal Area CalculatorBotanyFind the basal area of a tree from its DBH, roll a measured plot up into a stand density per acre or hectare, or estimate density with a prism.Zoology
Puppy Weight CalculatorZoologyPredict your puppy's adult weight from its current weight, age, and size class. See a likely range, a growth curve, and when it will be full grown.
How Big Will My Cat Get CalculatorZoologyPredict your kitten's adult weight from its age and current weight, from its breed and sex, or from the sizes of both parents, with a growth chart and a plain-English range.
Dog Chocolate Toxicity CalculatorZoologyEstimate the methylxanthine dose in mg/kg from your dog's weight, the chocolate type, and the amount eaten, then see the severity level and what to do next.
Cricket Chirp Temperature CalculatorZoologyEstimate air temperature from cricket chirps with Dolbear's law. Count chirps over any window, pick the species, and read the temperature in °F, °C, or K, or solve backward for the chirp rate.
Aquarium Volume CalculatorZoologyWork out how much water your aquarium holds from its shape and dimensions, in gallons or litres, with the water weight and an allowance for fill level and substrate displacement.Ecology
Carrying Capacity CalculatorEcologySolve the logistic growth model for carrying capacity, population, growth rate, or rate of change. Enter any three values and read the fourth, with charts and interpretation.
Allele Frequency CalculatorEcologyFind allele frequencies p and q and Hardy-Weinberg genotype frequencies from a recessive-trait prevalence, genotype counts, or allele counts - with carrier frequency and an equilibrium chi-square test.