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

Use our dog pregnancy due date calculator to estimate whelping day from mating, ovulation, LH surge or diestrus. See safe whelping window, days remaining and progress.

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.

Calculate percent yield from actual and theoretical yields. Real-time updates, unit options, step-by-step derivation, and PDF export. Free online tool.

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

Calculate Benadryl (diphenhydramine) dose for dogs by weight. See mg, mL, tablet/chew counts and 8–12h frequency. Educational tool—not veterinary advice.