Our Expert Curators
Every calculator on xCalculator is reviewed and endorsed by certified professionals in their field.
Dr. Sarah Chen, RD
Registered Dietitian
Health & Nutrition
Harvard-trained nutrition scientist with 12+ years of clinical experience. Dr. Chen specializes in translating complex nutritional science into actionable tools for everyday health decisions.
Calculators:
Marcus Webb, CFP®
Certified Financial Planner
Finance
Wharton graduate with 15+ years helping families achieve financial freedom. Featured in Forbes' '30 Advisors Changing Financial Education'.
Calculators:
Prof. Elena Vasquez
Applied Mathematics Professor
Math & Science
MIT PhD in Applied Mathematics. Teaching calculus and linear algebra for 13+ years. Believes the best tools help you understand the method, not just get the answer.
Calculators:
Coach Ryan Okafor
Strength & Conditioning Coach
Fitness
NSCA-CSCS certified with experience training semi-pro athletes and fitness enthusiasts. Uses data-driven methods to optimize performance.
Calculators:
Alex Kim
UX Researcher & Productivity Expert
Life Tools
Carnegie Mellon HCI graduate. Researches how people use digital tools in daily life. Believes the best tools require zero thinking—the answer appears before you ask.
Calculators:
Dr. Michael Torres
Sleep Scientist
Sleep & Recovery
Stanford PhD in Neuroscience specializing in sleep cycles and cognitive performance. Published 30+ peer-reviewed papers on sleep optimization.
Calculators:
Jennifer Lin, CFA
Investment Advisor
Investment & Planning
Chicago Booth MBA, former BlackRock portfolio manager. Now runs her own advisory firm focused on helping millennials achieve financial independence.
Calculators:
Dr. James Wilson
Exercise Physiologist
Body Composition
PhD from Australian Institute of Sport. Developed the integrated ideal weight model adopted by the fitness industry. Works with professional sports teams.
Calculators:
Why Expert Review Matters
Validated Formulas
Every calculation uses peer-reviewed methods from scientific literature.
Real-World Experience
Our curators bring decades of practical experience to every recommendation.
Unbiased & Independent
No sponsorships or affiliations. Just honest, evidence-based tools.