Health calculators, 24/7
Free, accurate health calculators. BMI, calorie needs, BMR, and ideal weight — instant results, no signup.
Get StartedPick any tool to get started. All free, all instant.
Find out if your weight is in a healthy range for your height.
Calculate Now →Daily calorie needs based on your age, activity, and goals.
Calculate Now →Calories your body burns at rest, every single day.
Calculate Now →Your ideal weight range using four trusted formulas.
Calculate Now →Every calculator, every feature. No paywall, no trial, no catch.
No email, no account, no tracking. Open the page and get your answer.
Designed mobile-first. Works perfectly on any phone, tablet, or computer.
Our calculators use formulas accepted by health professionals worldwide, including the Mifflin-St Jeor equation for BMR, the WHO BMI categories, and the Devine, Robinson, Miller, and Hamwi formulas for ideal weight. They're as accurate as the inputs you provide.
No. We don't ask for emails, names, or any personal information. Your data stays in your browser and is never sent anywhere.
Our calculators are educational tools. They're great for getting a baseline understanding of your health metrics, but they shouldn't replace advice from a qualified healthcare professional. Always consult a doctor for medical decisions.
Yes. Every calculator has a toggle for metric (kg, cm) and imperial (lb, ft+in) units so you can use whichever you're comfortable with.
Yes — we're constantly adding new health calculators. Coming soon: macro calculator, body fat percentage, water intake, and weight loss timeline.
Evidence-based articles on health and fitness.
The honest answer about BMI ranges, age, and what your number really means.
The actual math behind weight loss — how big your deficit should be.
Which actually matters for your health? When to use each.