Convert bird years to human years with a simple estimate. Useful for parrots, budgies, cockatiels, and more.

Calculate plant spacing by bed size, row spacing, and plant count. Plan layouts for gardens, pots, and raised beds.

Estimate your hamster’s age in human years. Compare Syrian and dwarf hamster lifespan stages quickly.

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.

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.