Pet
Dog Age Calculator
Your dog’s age in human years, using the size-adjusted modern scale.
Year 1 = 15, year 2 = +9, then +4 to +7.5…
Also called dog years calculator · how old is my dog in human years
Garden, Farm & Pets · 8 calculators
Pet Calculators
Dog and cat age in human years, food portions and calories, water intake, food duration and feeding costs.
Pet
Cat Age Calculator
Your cat’s age in human years using the standard feline ageing scale.
Year 1 = 15, year 2 = +9, then +4 per year
Also called cat years calculator · how old is my cat in human years
Pet
Dog Food Calculator
Daily dog food portion by weight, age and activity, with how long a bag lasts.
RER = 70 × weight^0.75, then adjusted for…
Also called how much to feed my dog · dog portion calculator
Pet
Cat Food Calculator
Daily cat food portion for wet, dry or mixed feeding, by weight and life stage.
MER = 70 × weight^0.75 × 1.2 × life stage…
Also called how much to feed my cat · cat portion calculator
Pet
Pet Food Duration Calculator
How long a bag or case of pet food lasts, and when to reorder.
days = bag size ÷ daily amount for all pe…
Also called how long will dog food last · pet food supply calculator
Pet
Pet Water Intake Calculator
How much water a dog or cat should drink daily, and when to worry.
roughly 50–55 ml per kg of body weight pe…
Also called dog water intake · cat drinking water amount
Pet
Aquarium Volume Calculator
Tank volume in litres and gallons, with the real water volume after substrate.
litres = length × width × water depth ÷ 1…
Also called fish tank volume · tank litres calculator
Pet
Pet Feeding Cost Calculator
Cost of feeding a pet per day, month and year, including treats.
daily cost = price per gram × daily grams…
Also called cost of feeding a dog · pet food cost calculator
Key pet formulas
| Dog Age | Year 1 = 15, year 2 = +9, then +4 to +7.5 per year by size |
|---|---|
| Cat Age | Year 1 = 15, year 2 = +9, then +4 per year |
| Dog Food | RER = 70 × weight^0.75, then adjusted for life stage and activity |
| Cat Food | MER = 70 × weight^0.75 × 1.2 × life stage factor |
| Pet Food Duration | days = bag size ÷ daily amount for all pets |
| Pet Water Intake | roughly 50–55 ml per kg of body weight per day, adjusted for diet |
| Aquarium Volume | litres = length × width × water depth ÷ 1000 |
| Pet Feeding Cost | daily cost = price per gram × daily grams × pets |
Pet questions
Is one dog year really seven human years?
No. That rule badly underestimates puppy development and overestimates later ageing, and it ignores size entirely.