About Dog Calculator Online
Last updated: October 3, 2026
Dog Calculator Online is a set of free calculators for dog owners. It answers the everyday questions that come down to a number, like how old your dog is in human years, how big your puppy will get, or how much to feed.
Who makes it
I'm Joan Ramos. I make small free websites, each built around one useful job.
It started with Mary's Printables, a free printables site I thought would stay quiet. It didn't. People began sending me notes: a teacher who'd found the worksheet her class needed, a parent using a chart with a child who was going through a hard time, someone printing something at the last minute.
What they cared about was that it was there, it worked, and it didn't ask them for anything in return. I've tried to make every site since the same way, and this one is no different.
Why I made dog calculators
Dog owners ask the same questions over and over. Is my dog a senior yet? How much should my puppy eat? What size crate do I need? The answers online are often scattered, buried in long pages, or still based on the old "one dog year equals seven human years" idea.
So I put the common questions in one place, with simple calculators that use methods published by veterinary sources, and short notes on how each answer is worked out.
What makes a good dog calculator
A good dog calculator asks only for things you can easily find out, like weight, age or a couple of measurements. It shows how it got its answer, and it's honest about what it can't know. Two dogs of the same size and age can still need different amounts of food or grow at different rates.
That's why the results here are estimates, often shown as a range. They're general information to help you understand your dog, not veterinary advice. If something seems off, or you're making a decision about your dog's health, please check with your vet.
What you get
- A dog age calculator that adjusts for your dog's size, shows a life stage and draws an aging curve
- A puppy weight estimate based on your puppy's age, current weight and size
- A food and calorie calculator with kibble cups, daily calories and a raw feeding mode
- A pregnancy calculator with an estimated due date, a normal range and week-by-week milestones
- A crate size finder from two quick measurements
- A body condition check to see if your dog may be under or over a healthy weight
- A copy button to save or share your result
- Guides on feeding, puppy growth, aging and more
- No signup and nothing to install
If something's off
If a result looks wrong, a calculator breaks on your device, or you'd like a new one, email me at [email protected]. It comes straight to me.
Dog Calculator Online is one of the free tools I make at FriendlyApps.