Health insights, calculator explainers, and product updates
Longer-form explainers for the calculators on this site — how a formula was derived, what its inputs mean clinically, and how to read the result. Start with the Mifflin-St Jeor guide if you're comparing BMR and TDEE formulas, or the BMI explainer if you want to understand what a BMI number does and doesn't tell you about your health. New posts go up as calculators are added or as questions from readers point to something worth explaining in more depth — each one links back to the calculator it covers and to the closest related posts, so you can move from formula to context and back without losing your place.
BMI is a useful screening number but a poor measure of body fat for any one person. See where it works, where it fails, and which measures to pair it with.
September 28, 2026
How the Mifflin-St Jeor equation calculates your Basal Metabolic Rate, why it's the formula clinicians recommend, and how to turn your BMR into a real daily calorie target.
July 31, 2026
A practical walkthrough of BMI calculation, why doctors still use it, its known limitations, and when to look at other metrics instead.
February 3, 2025
Introducing our free collection of medical calculators and health tools designed to help you understand your body metrics.
January 15, 2025