Free calculators for pets and animals. Free, no signup.
How much does a dog cost per year? Full 2026 breakdown.
Every dog money tool in one place — annual, first-year, insurance.
Daily hay and grain estimates by horse weight.
Tank volume, stocking estimator, and substrate calculator.
How many chickens do you need? Coop size and feed estimator.
Animals are easy to fall for and hard to budget for. Pet Cost HQ is a set of free calculators that put honest numbers on the commitment before it starts: what a dog costs per year, how much hay a horse actually eats, what an aquarium needs to stay stable, and what a backyard flock requires in space and feed. The site covers dogs and cats, horses, aquariums, and chickens, and every tool is free with no signup — you bring the facts about your animal, the calculators bring the arithmetic, and the guides explain the reasoning behind both.
The care math follows published guidance rather than opinion: university extension recommendations for equine feeding (the 1.5–2% of body weight forage rule), standard energy formulas for dogs and cats, and the conventional volume and stocking references for aquariums. Cost figures come from published pet-care surveys and typical U.S. prices, and they are presented as ranges with the swing factors named — region, size, and whether you board or keep animals at home move horse costs more than any other choice, for example. Wherever a price is local by nature, the tool asks for yours: your bale price, your vet's rates, your feed store's bag cost. An estimate built on your numbers is a budget; one built on national averages is a starting point, and the pages say which is which.
Pick the animal, enter the real facts — weight, workload, flock size, tank dimensions — and read the breakdown, not just the total. The line items are where decisions live: board versus at-home keeping, trims versus shoes, flakes guessed versus hay weighed. The guides linked from each calculator cover the judgment calls the math cannot make, like forage-first feeding or cycling a tank before fish arrive. And a standing rule across the whole site: for health, feeding, and housing decisions with real consequences, your veterinarian outranks any calculator, including these.