Health Calculators

Use our health calculators to get quick insights into your body metrics and daily needs. From BMI and calorie tracking to pregnancy timelines and hydration goals, each tool provides personalized results based on your inputs.

BAC Calculator — Estimate Your Blood Alcohol Level

Estimate your blood alcohol content (BAC) from the number of drinks, body weight, sex, and hours elapsed. Includes legal driving limits for your country.

BMI Calculator — Check Your Body Mass Index Instantly

Calculate your BMI from height and weight. Check if your body mass index falls within WHO's healthy range — underweight, normal, overweight, or obese.

BMR Calculator — Basal Metabolic Rate by Mifflin-St Jeor

Calculate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor formula. Enter weight, height, age, and sex to find how many calories your body burns at rest daily.

Body Fat Percentage Calculator — Navy & Skinfold Methods

Estimate your body fat percentage using the U.S. Navy circumference method or Jackson-Pollock 3-site skinfold method and see your body composition category.

Calorie Calculator — Daily Calorie Needs & BMR

Calculate your daily calorie needs and basal metabolic rate (BMR) using the Mifflin-St Jeor formula. Enter age, weight, height, and activity level for personalized results.

Calories Burned by Activity — MET-Based Calculator

Calculate calories burned by activity, body weight, and duration using MET values. Covers running, swimming, cycling, yoga, walking, and many more exercise types.

Ideal Weight Calculator — By Height Using 4 Formulas

How much should I weigh? Calculate your ideal weight by height and sex using 4 proven formulas: Robinson, Devine, Miller and Hamwi — plus healthy BMI range.

Maximum Heart Rate Calculator — Training Zones by Age

Calculate your maximum heart rate by age using the 220-age, Tanaka, and HUNT formulas. See all five heart rate training zones from fat burn to maximum effort instantly.

Ovulation Calculator — Fertile Window & Period Tracker

Calculate your ovulation date, fertile window, and next period based on your last menstrual period and cycle length. Identify your most fertile days for conception planning.

Pregnancy Due Date Calculator — Weeks & Trimester Tracker

Calculate your estimated due date using Naegele's rule based on your last menstrual period. Shows current pregnancy week, trimester, and days remaining until delivery.

Pregnancy Weight Gain Calculator — IOM Guidelines

Track whether your pregnancy weight gain is on target week by week. Based on IOM guidelines for your pre-pregnancy BMI category with recommended ranges for all trimesters.

Sleep Cycle Calculator — Find Your Ideal Bedtime

Find the best bedtime based on your wake-up time by aligning sleep with 90-minute cycles. Shows optimal times for 3 to 6 cycles so you wake refreshed every morning.

TDEE Calculator — Total Daily Energy Expenditure

Calculate your TDEE — total daily energy expenditure based on weight, height, age, sex, and activity level. Get calorie goals for weight loss or gain.

Water Intake Calculator — Daily Hydration by Weight

Calculate how much water you should drink per day based on your weight, activity level, and climate. Results shown in litres, millilitres, and glasses.

What health metrics can you calculate here?

This category covers a broad range of health-related calculations. The BMI calculator evaluates your body mass index based on height and weight. The calorie calculator and TDEE calculator estimate your daily energy needs for maintaining, losing, or gaining weight. You can also find tools for water intake, BAC, and reproductive health planning.

How is BMI calculated and what do the results mean?

BMI is calculated by dividing your weight in kilograms by your height in meters squared. The result falls into categories: underweight, normal weight, overweight, or obese. While BMI is a useful screening tool, it does not account for muscle mass or body composition, so it should be considered alongside other health indicators.

What is the difference between calorie and TDEE calculators?

The calorie calculator estimates how many calories you need per day based on your age, sex, weight, height, and activity level. The TDEE calculator (Total Daily Energy Expenditure) goes a step further by factoring in your basal metabolic rate and exercise habits to give a more precise daily calorie target for specific goals like fat loss or muscle gain.

How much water should I drink daily?

The water intake calculator estimates your recommended daily water consumption based on your body weight, activity level, and climate. Staying properly hydrated supports digestion, energy levels, and overall health. The calculator provides a personalized target in liters or glasses per day.

How does the BAC calculator work?

The BAC calculator (Blood Alcohol Content) estimates your blood alcohol level based on the number of drinks consumed, your body weight, sex, and the time elapsed since drinking. It provides a rough estimate useful for understanding how alcohol affects your body, though actual BAC can vary based on many individual factors.

What reproductive health tools are available?

The pregnancy calculator estimates your due date and tracks pregnancy milestones based on your last menstrual period or conception date. The ovulation calculator predicts your most fertile days within your cycle to help with family planning. Both tools provide timeline-based results that are easy to follow.