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8 free calculators · 4 AI Pro tools · Ad-free

A better body starts
with better data.

Science-backed calculators and AI coaching tools — built to help you set goals, stay consistent, and actually reach them.

Get Pro → Explore free tools
BMI Ideal weight Body fat Water intake
TDEE Macros BMR Calorie deficit
AI Goal Planner AI Coach AI Nutrition AI Fitness
Coach chat
PRO
22.8
Body Mass Index
Normal weight
UnderNormalOverObese
Your macros
Protein35%
Carbs25%
Fat40%
Meal plan
PRO
Meal 1: Breakfast
Scrambled eggs — 280 cal, 24g protein
Spinach — 41 cal, 5g protein
Avocado — 240 cal, 3g protein
Gluten-free oats — 150 cal, 5g protein
Total751 cal · 39g protein
Free to start
No account needed
Instant results
Calculated in your browser
Private by default
No data stored or shared
AI coaching
Personalized plans with Pro

Body metrics

4 calculators
BMI calculator
Calculate your body mass index and healthy weight range for your height.
Ideal weight calculator
Find your ideal weight range using four evidence-based formulas.
Body fat % estimator
Estimate body fat percentage using the Navy Method with simple measurements.
Water intake calculator
Get your daily hydration target based on weight and activity level.

Nutrition

4 calculators
TDEE calculator
Find your total daily energy expenditure based on age, size, and activity level.
Macro calculator
Get your daily protein, carb, and fat targets with rate selector and macro sliders.
BMR calculator
Calculate your basal metabolic rate — the calories your body burns at complete rest.
Calorie deficit calculator
Calculate your deficit and estimated time to reach your goal weight.

AI coaching

Available with Pro

Why BetterBodySuite?

Science-backed formulas
Every calculator uses established medical and nutritional formulas — Mifflin-St Jeor, Navy Method, Hamwi, and more.
No data collected
All calculations happen in your browser. We never store, sell, or share any of your health information.
AI-powered Pro tools
Upgrade to Pro for AI-powered meal plans, coaching, plateau breaking, and personalized recommendations.
Built for real results
Every tool is designed to give you actionable numbers — not generic advice — so you can make real progress toward your goals.
⚗️ Science-backed
🔒 No account needed
⭐ AI Pro coaching
💪 Built for results
📱 Works as mobile app
🔐 Your data stays private