All 28 calculators

Free, evidence-based, sourced math. Filter by species or category to find what you need.

All calculators

Dog age calculator

Real dog years to human years (AKC + Wang).

Cat age calculator

AAFP feline life-stage formula.

Puppy growth

Project adult weight by size band.

Compare a dog and a cat

Cross-species human-age comparison.

Compare two dogs

Side-by-side dog-age comparison.

Daily calorie needs (dogs)

NRC RER × MER, life-stage adjusted.

Daily calorie needs (cats)

Cat-tuned, hepatic-lipidosis aware.

Calorie deficit (weight loss)

Daily target for safe weight loss.

Wet vs dry food split

Grams of each per day.

Raw food amount

PMR 80/10/10 breakdown by weight.

Treat allowance

10% rule + treat database.

Ideal weight (BCS)

Back-calculate target from body condition.

Senior pet wellness tracker

Log weight + behaviour over time, with anomaly flagging.

Chocolate toxicity

Methylxanthine dose, severity bands.

Grape toxicity

Kidney-injury risk, hotline numbers.

Raisin toxicity

Concentrated-grape dose math.

Xylitol toxicity

Sugar-free gum / peanut butter exposure.

What human foods are safe?

Searchable safe / caution / toxic list.

Dog poop color guide

What stool color and shape mean.

Flea & tick prevention guide

Collar vs topical vs oral — honest trade-offs.

Dewormer guide

Which worm, which drug. Puppy/kitten schedule.

Water intake

From food vs from the bowl.

Crate size guide

Right crate by weight + measurements.

Litter box count

The n+1 rule for cat households.

Cat litter cost

Monthly + annual spend by litter type.

Lifetime cost of ownership

15-year ownership budget.

Dog pregnancy / gestation

Due date + prenatal milestones.

Cat pregnancy / gestation

Due date + queen-specific milestones + lipidosis/eclampsia warnings.