How to Calculate BMI Without Calculator
Learn the simple formula: BMI = weight (kg) ÷ height² (m). Our step-by-step guide shows you how to manually calculate your Body Mass Index...
Read More →BMI Calculator
Body Mass Index
BMR Calculator
Basal Metabolic Rate
Body Fat Calculator
Body Fat Percentage
Calorie Calculator
Daily Calorie Intake
Ideal Weight
Healthy Weight Range
Due Date Calculator
Pregnancy Due Date
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Heart Rate Zones
Target Heart Rate
Blood Pressure
Check Your BP Category
Water Intake
Daily Water Needs
Macro Calculator
Protein, Carbs, Fat
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Health & Fitness Guides
Learn how to use health calculators effectively
Understanding Basal Metabolic Rate
Your BMR is the number of calories your body needs at complete rest. Learn how to calculate it manually using the Mifflin-St Jeor equation...
Read More →Accurate Body Fat Measurement Methods
From skinfold calipers to Navy method formulas, discover the most accurate ways to measure body fat percentage at home without expensive equipment...
Read More →Frequently Asked Questions
How do I calculate BMI manually without using an online calculator?
To calculate BMI manually, you need your weight in kilograms and height in meters. Use the formula: BMI = weight (kg) ÷ (height (m) × height (m)). For example, if you weigh 70kg and are 1.75m tall: 70 ÷ (1.75 × 1.75) = 22.86. This falls in the normal weight category (18.5-24.9).
What's the difference between BMI and body fat percentage?
BMI measures weight relative to height and estimates total body mass. Body fat percentage specifically measures fat mass vs. lean mass. A muscular athlete might have a high BMI but low body fat. For accurate health assessment, consider both measurements together.
How accurate is the Basal Metabolic Rate (BMR) calculation?
Our BMR calculator uses the Mifflin-St Jeor Equation, which is 95% accurate for most people. However, factors like muscle mass, genetics, and thyroid function can affect actual BMR. For precise measurements, metabolic testing is recommended.
Can I calculate my pregnancy due date manually?
Yes! Pregnancy due date = First day of last menstrual period + 280 days (40 weeks). For irregular cycles, add 266 days to conception date. Our calculator automates this using Naegele's Rule, the standard medical calculation method.
What's the formula for calculating daily water intake?
Basic formula: Weight (kg) × 30-40 ml = Daily water in ml. Our calculator uses: 30ml/kg for low activity, 35ml/kg for moderate, 40ml/kg for high activity. Divide by 1000 to get liters. Example: 70kg × 35 = 2450ml (2.45L).
How do I calculate heart rate zones for fat burning?
First calculate maximum heart rate: 220 - age. Fat burning zone = 60-70% of max HR. For a 30-year-old: Max HR = 190. Fat burn zone = 114-133 bpm. Our calculator provides all training zones including cardio (70-80%) and peak (80-100%).
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