Health Calculators
Free health calculators for BMR, TDEE, body fat and more.
Example: 180 lbs, 5'10", age 30, male → BMR: 1,715 cal/day
Which Health Calculator Should You Use?
🔥 Understand your metabolism
Use BMR Calculator to learn your basal metabolic rate. The foundation of all calorie planning.
⚡ Plan weight changes
Use TDEE Calculator to set precise calorie and macro targets for loss, gain, or maintenance.
📐 Measure body composition
Use Body Fat Calculator for US Navy method body fat estimation and FFMI analysis.
💧 Optimize hydration
Use Water Intake Calculator for personalized daily hydration based on your lifestyle.
📏 Assess your weight
Use Weight & Height Calculator for BMI, ideal weight from 4 formulas, and waist-to-height ratio.
🩺 See your full picture
Use Health Dashboard to see BMI, BMR, TDEE, macros, and water needs in one place.
Health Calculators at a Glance
Quick-reference comparison of health calculators and what they measure.
| Calculator | What It Measures | Key Formulas Used |
|---|---|---|
| BMR Calculator | Calories at complete rest | Mifflin-St Jeor, Harris-Benedict, Katch-McArdle |
| TDEE Calculator | Total daily energy expenditure | BMR × activity multiplier + TEF |
| Body Fat Calculator | Body fat percentage | US Navy circumference method |
| Water Intake | Daily hydration needs | Weight-based + activity/climate/diet adjustments |
| Weight & Height | BMI, ideal weight, WHtR | Devine, Miller, Hamwi, Robinson |
| Health Dashboard | Complete health overview | Combines all health metrics |
Popular Health Calculators
BMR Calculator — 3 Formulas Compared
See your BMR calculated with Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle side by side. Includes BMR-by-age chart.
TDEE Calculator with Metabolic Adaptation
Get calorie and macro targets for any goal. Tracks metabolic adaptation and compares 3 BMR formulas for accuracy.
Water Intake Calculator — Personalized Plan
Adjusts for weight, activity, climate, diet, pregnancy, and breastfeeding. Includes a daily drink schedule.
BMR Calculator
Calculate your Basal Metabolic Rate using Mifflin-St Jeor formula.
TDEE Calculator
Calculate Total Daily Energy Expenditure for weight management.
Body Fat Calculator
Calculate body fat percentage using the US Navy method.
Water Intake Calculator
Calculate how much water you should drink daily based on your body.
Braces Cost Calculator
Estimate braces and Invisalign costs by type, age, and complexity — with insurance, HSA/FSA, and payment-plan math.
Dental Implant Cost Calculator
Estimate dental implant costs with prep procedures, see what insurance really pays, and compare implants vs bridges vs dentures over 25 years.
IVF Cost Calculator
Estimate IVF costs with add-ons, model cumulative success by age and cycles, and compare financing options.
Hair Transplant Cost Calculator
Estimate hair transplant costs by Norwood stage, graft count, and technique — with donor supply checks and lifetime cost math.
Drug Rehab Cost Calculator
Estimate rehab episode costs by level of care, model real insurance out-of-pocket, and compare ways to pay the gap.
Weight & Height Calculator
Calculate ideal weight range based on your height and age.
Health Dashboard
View all your health metrics in one comprehensive dashboard.
All Health Calculators
Quick-reference table of every health calculator available on GM Calculator.
| Calculator | Best For | Link |
|---|---|---|
| 🔥 BMR Calculator | Calculate your Basal Metabolic Rate using Mifflin-St Jeor formula. | Use Tool → |
| ⚡ TDEE Calculator | Calculate Total Daily Energy Expenditure for weight management. | Use Tool → |
| 📏 Body Fat Calculator | Calculate body fat percentage using the US Navy method. | Use Tool → |
| 💧 Water Intake Calculator | Calculate how much water you should drink daily based on your body. | Use Tool → |
| 🦷 Braces Cost Calculator | Estimate braces and Invisalign costs by type, age, and complexity — with insurance, HSA/FSA, and payment-plan math. | Use Tool → |
| 🔧 Dental Implant Cost Calculator | Estimate dental implant costs with prep procedures, see what insurance really pays, and compare implants vs bridges vs dentures over 25 years. | Use Tool → |
| 👶 IVF Cost Calculator | Estimate IVF costs with add-ons, model cumulative success by age and cycles, and compare financing options. | Use Tool → |
| 💈 Hair Transplant Cost Calculator | Estimate hair transplant costs by Norwood stage, graft count, and technique — with donor supply checks and lifetime cost math. | Use Tool → |
| 🆘 Drug Rehab Cost Calculator | Estimate rehab episode costs by level of care, model real insurance out-of-pocket, and compare ways to pay the gap. | Use Tool → |
| 📊 Weight & Height Calculator | Calculate ideal weight range based on your height and age. | Use Tool → |
| 📋 Health Dashboard | View all your health metrics in one comprehensive dashboard. | Use Tool → |
Health Calculator FAQs
Everything you need to know about health and fitness calculations
What is BMR and why does it matter?
BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest just to maintain vital functions like breathing, circulation, and cell production. It accounts for 60-75% of your daily calorie burn. Knowing your BMR helps you set accurate calorie targets for weight loss, gain, or maintenance. Our BMR Calculator uses the Mifflin-St Jeor equation.
What is the difference between BMR and TDEE?
BMR is your calorie burn at rest — what you'd burn if you stayed in bed all day. TDEE (Total Daily Energy Expenditure) adds all activities on top: walking, exercise, digestion, even fidgeting. TDEE = BMR × activity multiplier (1.2 for sedentary up to 1.9 for very active). Use our TDEE Calculator to plan your calorie intake for weight goals.
How much water should I drink per day?
General guidelines suggest 3.7 liters for men and 2.7 liters for women (including water from food). However, optimal intake depends on your weight, activity level, and climate. Our Water Intake Calculator personalizes your recommendation based on your specific factors.
How is body fat percentage measured?
Our Body Fat Calculator uses the US Navy method, which takes circumference measurements (neck, waist, and hips for women; neck and waist for men). It provides an accurate estimate without expensive equipment. We also show your body fat category and healthy ranges based on age and gender.
What is a healthy BMI range?
According to WHO standards: below 18.5 is underweight, 18.5-24.9 is normal weight, 25.0-29.9 is overweight, and 30.0+ is obese. However, BMI doesn't account for muscle mass. Athletes may have a high BMI but low body fat. Use our Weight & Height Calculator for BMI, or the Health Dashboard for a complete picture combining BMR, TDEE, and body fat.
Reviewed by Shahid
Content Reviewer & Calculator SpecialistContent reviewer specializing in marketing, finance, health, and math calculators on GM Calculator.