About the Author of VitalsCalc's Guides

Credentials

ACSM Certified Personal Trainer (ACSM-CPT)American College of Sports Medicine, certified since March 2019. Anyone can check ACSM credentials with ACSM's ProFinder or by contacting ACSM's certification department.
Precision Nutrition Level 1 CertifiedPrecision Nutrition, certified October 2026.

ACSM Certified Personal Trainer certificate conferred upon Eric Adriaansen, certification date 03-29-2019 — ACSM Certified Personal Trainer certificate. Certificate and member numbers hidden.

Precision Nutrition Level 1 Certified certificate for Eric Adriaansen, certification date October 7th, 2026 — Precision Nutrition Level 1 certificate.

How the guides are written

Every number in a VitalsCalc guide comes from a published source, linked in that guide's Sources section, and matches what the app calculates.

The guides and calculators are general information, not medical advice. A certified trainer and nutrition coach is not a doctor or dietitian. For anything about your health, talk to your doctor.