Biology

Bird Age Calculator helps you convert bird years to human years by species or custom lifespan. Estimate your bird’s human-equivalent age fast and easily.

Plant Spacing Calculator helps you estimate plants needed, plant density, and area per plant for landscape beds, crop rows, and square-foot gardening.

Hamster Age Calculator helps you convert hamster years to human years fast. Compare Syrian and dwarf hamster age, estimate life stage, and get accurate results instantly.

Convert dog years to human years by breed size. Get a clear age estimate for puppies, adults, and seniors.

Instantly build a 4×4 Punnett square for two traits, see genotype and phenotype probabilities with this interactive dihybrid cross calculator.

Dog Pregnancy Calculator helps you estimate your dog’s due date, gestation timeline, and expected whelping window from the mating date.

Estimate your dog’s adult weight in kg, lb, g or oz from age and current weight. Puppy size calculator with toy, small, medium, large & giant categories.

Punnett Square Calculator to predict genotype and phenotype ratios for monohybrid and dihybrid genetic crosses.

Convert cat years to human years (and back). Use our Cat Age Calculator with piecewise method, quick chart, and downloadable PDF.