Free tools
Pet Calculators
Free, no sign-up, no email. Built because we kept answering the same questions.
Dog Age Calculator
Convert your dog's age to human years using adult size, which is what actually drives ageing. The multiply-by-seven rule is wrong at both ends.
Aquarium Volume & Stocking Calculator
Real water volume from your tank's dimensions, a filter flow target, and a conservative stocking plan based on adult fish size.