Health Calculators

The health section gathers the calculators most useful for tracking everyday wellness: Body Mass Index, Basal Metabolic Rate, daily calorie targets, ideal body weight, body-fat percentage, water intake, age, pregnancy and ovulation timing, and sleep cycles.

These calculators use widely accepted formulas — WHO BMI categories, the Mifflin-St Jeor BMR equation, US Navy body-fat method, Naegele's rule for due dates and similar references — and they produce estimates, not diagnoses. They are useful for self-tracking and for understanding the numbers your doctor or trainer might use.

When to use these tools: Use these tools to check your BMI category, plan a calorie target for weight loss or gain, estimate hydration needs, or work out a likely due date or fertile window. For medical decisions, always consult a qualified health professional.

Tap any calculator below to load it in place. Every tool on this page is free, runs in your browser and does not need a sign-up.

BMI Calculator

Body Mass Index from height and weight, with WHO categories — underweight, healthy, overweight and obese.

BMR Calculator

Basal Metabolic Rate — the calories your body burns at rest — using the Mifflin-St Jeor equation.

Calorie Calculator

Daily calorie target based on age, sex, weight, height and activity level, plus adjustments for weight loss or gain goals.

Ideal Body Weight

Estimate ideal body weight for your height using common medical formulas (Devine, Robinson, Miller, Hamwi).

Body Fat Calculator

Body-fat percentage using the US Navy circumference method, with category ranges for men and women.

Water Intake

Daily water requirement based on weight and activity level, with sensible Indian-climate adjustments.

Age Calculator

Exact age in years, months, days, weeks, hours and minutes from your date of birth.

Pregnancy Due Date

Estimated due date and current week of pregnancy from the last menstrual period (Naegele's rule).

Ovulation Calculator

Estimate the fertile window and likely ovulation day from your last period and cycle length.

Sleep Calculator

Suggest wake-up or bedtimes based on 90-minute sleep cycles, so you wake at the end of a cycle rather than mid-cycle.

A note on accuracy

The numbers produced by these calculators are estimates based on the inputs you provide and the formulas shown in each tool's "How it is calculated" section. They are intended for planning, learning and quick checks — not as legal, medical, tax or investment advice. For decisions that have real financial, legal or health consequences, please consult a qualified professional. See our disclaimer for the full statement.