Use our Punnett Square Calculator to model a monohybrid cross, see AA/Aa/aa probabilities, genotypic & phenotypic ratios, and download a PDF of the results.

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

Estimate your puppy’s adult weight and size group from age and current weight. Get ranges, height guide, and a downloadable PDF.

Calculate a dog due date from mating. Get average, earliest & latest whelping dates, days since mating, and download a PDF of results.

Model dihybrid crosses with a 4×4 Punnett square. See A_B_:A_bb:aaB_:aabb ratios, genotype probabilities, and download a PDF of results.

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.