Biology Calculators

Population dynamics, genetics, and biological science calculators.

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Dog Age Calculator

Convert your dog's age to human years based on breed size with updated veterinary age-equivalent formulas.

Convert your cat's age to human years using the veterinary-approved feline aging formula.

Calculate your dog's daily calorie needs and food portions based on weight, age, and activity level.

Calculate aquarium tank volume in gallons and liters, plus recommended heater wattage and filter capacity.

Estimate your pregnancy due date, current gestational week, and trimester using Naegele's rule from your last period.

Estimate your ovulation date and fertile window based on your cycle length and last menstrual period date.

Estimate your baby's weight and height percentiles based on age and sex using WHO growth chart standards.

Estimate the date of conception from a due date or birth date by subtracting the standard 266-day gestation period.

Calculate recommended daily walks, minutes per walk, and weekly mileage based on your dog's breed size and age.

Calculate your aquarium's stocking capacity, bioload percentage, and fish compatibility based on tank size and filtration.

Calculate bacterial or cell population growth based on doubling time. Estimate total cells after a given period using exponential growth formulas.