About Pets in World

Pets in World is an independent website run by a small team of pet owners who build web tools. We are not a veterinary practice, a clinic or a professional body, and we do not claim any veterinary or nutritional qualification. What we do have is a habit of noticing where pet owners get stuck on ordinary questions, and the skills to turn those questions into something usable in a browser.

The site started with one recurring frustration. Working out how much food a pet actually needs means digging through label charts, converting units and looking up formulas, and most people give up and estimate. That felt like a problem a calculator could solve properly, so we built one.

Everything here is published openly on the Pets in World homepage and is free to use without an account.

We do two things. We build browser-based tools that do a specific calculation clearly, and we write supporting material that explains what the tool is doing and where its limits are.

Every tool runs entirely in your browser. There is no account to create, nothing to install, no data sent to a server and no results stored anywhere. You enter numbers, you get an estimate, you close the tab.

Alongside the tools, we publish explanations, worked examples and answers to the questions people actually ask. If you have a question that is not covered, the pet feeding FAQ is the best place to start.

The Pet Food Calculator is the main tool on the site, and it is where most of our attention goes.

• Primary tool

  Pet Food Calculator

  Estimates a daily food amount from species, body weight, life stage, activity level and the calorie density of the food you actually feed. It shows the daily energy figure in kcal, the equivalent weight in grams and a per-meal breakdown, and it prints the formula it used so you can check the arithmetic yourself.

  Dogs and cats use the standard resting-energy equation. Rabbits, birds and small rodents use separate species-specific estimates, and those results are labelled as rough on purpose, because one formula does not fit every animal.

  Open the Pet Food Calculator
• In progress

  More tools are being built

  We add a tool when we are confident we can do it properly and explain its limits honestly. Rather than list things that do not exist yet, we would rather you judge us on what is already live. New tools appear on the homepage as they are finished.

We try to be careful about the difference between what a calculation can tell you and what it cannot.

• We show our working

  Every result comes with the formula that produced it. If you disagree with an assumption, you can see exactly where it entered the calculation.

• We call an estimate an estimate

  Published feeding formulas are built on population averages. A real animal may need noticeably more or less, and we say so rather than presenting a number as if it were exact.

• We do not stretch one formula across every species

  The equation used for dogs and cats was not written for rabbits or birds. Where we use a simplified species-specific estimate instead, the result is flagged as rough on the page rather than buried in small print.

• We stay inside our lane

  We publish general educational information and arithmetic. We do not diagnose, we do not prescribe diets, and we do not offer opinions on an individual animal. Those belong with a veterinarian who can examine your pet.

• We correct things

  If something on the site is wrong, we would rather hear about it and fix it than leave it standing. Tell us what you found and we will look at it.

Most pet questions get answered while you are standing next to the food bin with one hand full. That is the moment a tool has to work, which shapes everything about how we build.

So the calculator asks for the fewest inputs that still produce a defensible answer. It works on a phone with large touch targets. It gives a result instantly without a page reload, and it does not interrupt you with pop-ups or bury the answer under advertising.

A more elaborate tool that asked twenty questions might be marginally more precise, but almost nobody would finish it. A simple one that people actually use is more useful than a thorough one they abandon.

An estimate is a starting point, not an instruction. The most important part of feeding a pet well happens after the calculation: watching how the animal actually responds over the following weeks, weighing them regularly, and adjusting.

We will not publish content that encourages rapid weight loss, restrictive feeding, unverified home remedies or anything else that treats a pet as a number to be optimised. Where a situation calls for professional input, we say so plainly instead of trying to answer it ourselves. That includes pregnancy, illness, recovery, prescription diets and any significant or unexplained weight change.

We would rather be useful for the ordinary questions and honest about the limits than pretend to cover everything.