Smarter care decisions, backed by veterinary science.
Six free, evidence-based calculators that turn what your vet would tell you into clear, actionable numbers — for your dog's calories, weight, hydration, age, body condition, and lifespan.
Every tool a thoughtful dog owner needs
Each calculator uses the same formulas your veterinarian relies on, paired with plain-language guidance you can actually apply at home.
Dog Calorie Calculator
Daily calorie requirement based on weight, age, activity, life stage and neuter status — using the standard RER × MER formula.
Calculate caloriesBody Condition Score
Assess your dog on the 1–9 BCS scale using rib, waist, and abdominal tuck observations. Find out if your dog is at a healthy weight.
Score your dogIdeal Weight Calculator
Project your dog's ideal target weight from current weight and body condition score. Plan a safe weight-loss timeline.
Find target weightDog Age in Human Years
Modern conversion using the 2020 epigenetic-clock formula — far more accurate than the old "multiply by 7" myth.
Convert ageWater Intake Calculator
How much water your dog should drink daily, adjusted for food type, activity level, weather and life stage.
Check hydrationLife Expectancy Calculator
Estimate your dog's expected lifespan from breed size, body condition, lifestyle, and dental & care factors.
Estimate lifespanBuilt differently than the rest
Most online dog calculators give you a single number with no context. We give you the number, the reasoning, and what to do next.
Veterinary formulas
Same equations used in clinical nutrition (RER, MER), AAHA guidelines, and peer-reviewed lifespan studies.
Explained, not just calculated
Every result tells you what the number means and what action — if any — to take next.
Printable & shareable
Export results to share with your veterinarian or save as a reference for your dog's wellness records.
Works on every device
Fully responsive. No app to install. No signup. No tracking pixels selling your data.
Read before you calculate
Plain-English guides on the science behind each number — written so you understand the "why," not just the "what."
How many calories does my dog actually need?
Why the back of the food bag is a starting point at best — and how to calculate calories the way veterinary nutritionists do.
Read articleBody condition score: the 30-second check that beats the scale
Why what you see and feel tells you more than any number on the scale — and how to score your dog at home in under a minute.
Read articleForget "multiply by 7": the real way dogs age
A 2020 study cracked the dog-aging code — and the answer involves logarithms. Here's why your 2-year-old dog is older than you think.
Read articleThe right number changes the conversation.
Whether it's calories at dinner or weight at the next vet visit — start with a number you can defend, not a guess.
Try the Calorie Calculator