About Cat Calculator Online
Last updated: October 3, 2026
Cat Calculator Online answers the cat questions that end in a number. How old is my cat in human years? How much should she eat? How big will this kitten get? Each answer takes a few taps, and it's all free.
Who makes it
I'm Joan Ramos, and I make small free websites that each try to do one job well.
The first was Mary's Printables, a free printables site I honestly thought only a handful of people would find. Then the emails started. A teacher wrote that she'd finally found the worksheet her class needed. A parent told me about using one of the charts with a child who was going through a hard time. Someone else had printed something minutes before they needed it.
What they thanked me for was simple: the page was there, it worked, and it didn't ask them for anything first. That's the bar I set for every site I've built since, this one included.
Why a cat calculator site
Cat owners ask a lot of number questions, and the answers online are often rough guesses. The old "multiply by seven" rule is a good example. It's easy to remember, but it doesn't match how cats actually age. A one-year-old cat is closer to a teenager than a seven-year-old child.
I wanted one place where those questions get a clear answer that shows how it was worked out, so you can see why the number is what it is.
What makes good cat care help
Good help starts with your cat, not an average cat. A calculator should ask about the things that change the answer, like age, weight, indoor or outdoor life, and body shape, and then explain itself in plain words.
It should also be honest about its limits. Every number here is a general estimate. Your vet has actually met your cat, so if something about her health, weight or eating worries you, check with your vet. That matters more than anything a calculator says.
What you get
- Six calculators, including cat age, kitten growth, food and daily calories, pregnancy due dates, and a healthy-weight check
- A cat age calculator based on published feline life stages, with indoor and outdoor options
- A body check that asks a few hands-on questions instead of going by weight alone
- Age pages for every year from 1 to 18, showing each one in human years
- More than 300 guides on feeding, health, behavior, kittens, senior cats and safe and unsafe foods
- Clear notes on how each answer is worked out, so nothing is a mystery
- Nothing to install and no account
If something's off
If a result looks wrong for your cat, a guide has a mistake, or a calculator acts up on your phone, email me at [email protected]. I read every message myself.
Cat Calculator Online is one of a family of free tools I run at FriendlyApps.