Free tools

Dog calculators built on veterinary studies

Every number has a source. No sign-up, nothing stored, and each calculator can be embedded on your own site for free.

Your dog's age in human years, size-adjusted, plus the epigenetic clock and current life stage.

Breed range adjusted by sex, neuter status and body condition, using published cohort effects.

Daily calories from the NRC equation and cups per day for your specific food.

Body condition score to ideal weight, pounds to lose and a safe timeline.

Predict adult weight from today's weight and age, with a growth curve by breed size.

When your dog becomes a senior by AAHA life stages, with a checklist for each stage.

The HHHHHMM scale vets use in hospice care, as a weekly tracker with a saved trend.

See how each calculator works and the studies behind it. Prefer a table? The dog age chart covers ages 1 to 20 by size.