For the keepers, growers & companions.
Practical math for the animals in your life. Size a coop, plan a hive, gauge a fish tank, or translate a wagging tail into people-years — calculators built by folks who actually keep them.
Seven calculators for tanks, coops, hives & companions.
Every tool is single-page, mobile-first, and gives you a real answer — plus the formula it used, so you can sanity-check the math.
Aquarium Size Calculator
Estimate tank volume in gallons and liters from length, width, and height. Get water weight and a recommended filter GPH — works for rectangle, bow-front, and hexagon tanks.
Bee Hive Size
Plan boxes, frames, and storage capacity for Langstroth, top-bar, or Warré setups.
Cat Age Chart
Translate cat years into human years with a life-stage chart from kitten to senior.
Coop Size Calculator
Square footage for your flock — coop interior, run, nest boxes, and roost length.
Chicken Coop Size Guide
Reference tables and quick-pick sizing for bantams, standards, and heavy breeds.
Dog Age Calculator
Convert dog years to human years using the modern epigenetic formula, breed-adjusted.
Horse Feed Calculator
Daily hay and grain by body weight, workload, and life stage — pasture and stalled.
Three taps. Real numbers. No sign-up, no paywall, no scrolling past a 2,000-word recipe story.
Pick a calculator
Aquarium, hive, coop, feed — each tool is purpose-built for one job and gets out of your way.
Enter what you know
Length, weight, count, breed. Smart defaults fill in the rest so you can answer fast.
Get the formula
We show the math we used — copy it, save it, or share the link with a printable result.
Read up before you size up.
Plain-language explainers from our blog covering the assumptions behind each calculator — and where they break.
Why one inch of fish per gallon is mostly nonsense.
Surface area, bioload, and the real numbers behind a healthy tank.
Sizing your first hive: deep, medium, or 8-frame?
A weight-aware guide to which configuration fits your back and your bees.
The 4-and-10 rule for chicken coops, explained.
Why interior space, run space, and ventilation are three different math problems.
Bookmark this page — your animals are going to outgrow their math eventually.
Whether you’re upgrading from a 10-gallon to a 75, adding a third hive, or expanding the flock past a half-dozen, you’ll be back. We promise nothing will be behind a paywall.
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