The calculators you need for
everyday health
BMI, BMR, due date and more — a complete set of health calculators.
BMI Calculator
Body mass index and weight category from height and weight
Ideal Weight
Healthy weight range based on your height
BMR & TDEE
Basal metabolic rate and daily calories by activity
Body Fat %
Estimate body fat percentage from BMI and age
Calories Burned
Calories burned by exercise type, time, and weight
Due Date Calculator
Estimated delivery date and pregnancy week from your last period
Ovulation Calculator
Predict ovulation and fertile window from your cycle
Daily Water Intake
Daily water target from weight and activity level
Alcohol Calories & BAC
Estimate calories and blood alcohol from drinks
The easiest way to understand your body in numbers
Health management starts with concrete numbers, not a vague feeling. Is my weight in the standard range? How many calories should I eat to lose or maintain weight? How much do I burn in a 30-minute workout? How much water should I drink a day? You can answer these with just a few simple inputs. Health Calculators brings the health math you reach for every day into one place so anyone can get results quickly.
It covers a wide range — from BMI, ideal weight, BMR and TDEE, body fat, and calories burned for weight and diet management, to due-date and ovulation calculators for those preparing for or going through pregnancy, plus daily water intake and alcohol calories & blood alcohol concentration. Each calculator uses widely-known standard methods — the Mifflin-St Jeor equation, METs exercise-intensity tables, Naegele's rule, the Widmark formula and more — to provide reliable estimates.
The biggest benefit is privacy. Even when you enter sensitive information like height, weight, or menstrual cycle, that data is never sent to a server — it is used for the calculation only inside your browser. No sign-up, no app install, and the moment you close the page everything you entered disappears without a trace. Note that all results are reference estimates for general information, so always consult a medical professional about your actual health.
FAQ
Are the health calculators free?
Yes. Every calculator is completely free with no usage limits, and no sign-up or email is required.
Is my input — like height and weight — stored anywhere?
No. Every calculation runs only in your browser. Your inputs are never sent to a server or stored, and they disappear when you close the page.
Can I trust the results as a medical diagnosis?
No. These calculators are reference estimates based on published standard formulas. Individual health varies widely, so always consult a medical professional for an accurate diagnosis or prescription.
Which calculators are included?
Nine calculators people use often: BMI, ideal weight, BMR & TDEE, body fat percentage, calories burned, due date, ovulation & fertile window, daily water intake, and alcohol calories & blood alcohol concentration.
Does it work on mobile?
Yes. Every calculator is responsive and works the same in desktop and smartphone browsers, with no app to install.