About Diet Planner

Diet Planner is a free online health and fitness toolkit built for one purpose: to give you accurate, science-based answers without the noise. No subscriptions. No sign-ups. No upsells. Just the numbers you need to make real decisions about your health. Whether you want to lose weight, build muscle, track your daily calorie intake, or calculate your BMI, our tools are designed to be fast, accurate, and easy to use for complete beginners and experienced fitness enthusiasts alike.

What We Do

We build free, browser-based health calculators and nutrition tools that help you take control of your diet and fitness journey. Our tools use validated scientific formulas including the Mifflin-St Jeor equation for BMR, the Harris-Benedict formula for TDEE, and WHO-standard BMI classifications to deliver results you can actually trust.

Our current toolkit includes:

Who This Is For

Diet Planner is built for anyone who wants straightforward answers to health and nutrition questions. You do not need to be a certified nutritionist or personal trainer to use our tools effectively.

We serve:

  • People starting a weight loss journey who need a clear daily calorie target
  • Fitness enthusiasts tracking their macronutrient intake — protein, carbohydrates, and dietary fat
  • Gym-goers and powerlifters who want to measure strength levels and one rep max
  • Busy individuals who need a quick, reliable tool without downloading an app
  • Health professionals looking for a clean reference calculator for client consultations

How Our Tools Work

Every calculator on Diet Planner is powered by peer-reviewed nutritional science and established clinical formulas. Here is the basic methodology behind our most-used tools:

Calorie & Weight Management Tools

We calculate your Basal Metabolic Rate (BMR) — the number of calories your body needs at complete rest using the Mifflin-St Jeor equation, which clinical research has identified as the most accurate formula for modern body compositions. This is then multiplied by an activity factor to estimate your Total Daily Energy Expenditure (TDEE). From there, a calorie deficit or calorie surplus is applied depending on your goal weight loss, maintenance, or muscle gain.

BMI & Body Composition

Our BMI calculator uses the standard World Health Organization (WHO) formula: weight in kilograms divided by height in meters squared. Results are classified across the standard underweight, normal weight, overweight, and obese ranges. We support both metric (kg/cm) and imperial (lbs/inches) inputs for global accessibility.

Strength & Performance

The Strength Level Calculator estimates your one rep maximum (1RM) using the Epley formula and compares your lifts squat, bench press, deadlift, and overhead press against population strength standards. This gives you a percentile ranking based on bodyweight and training experience, from beginner to elite level.

Why Free? And Why No Sign-Up?

Most health tools either lock results behind a paywall or harvest your data in exchange for access. We believe that basic nutritional information your calorie needs, your BMI, your healthy weight range is a right, not a product.

Diet Planner is and will always be free to use. No account required. No email address. No personal data stored. You get your result instantly and privately.

Our Approach to Accuracy

We do not make up numbers. Every result our tools produce is based on formulas validated in peer-reviewed nutritional science and published health guidelines from organizations including the World Health Organization (WHO), the American Dietetic Association, and the Centers for Disease Control and Prevention (CDC).

That said, all calculators produce estimates. Factors like genetics, hormonal health, gut microbiome, sleep quality, and stress levels all influence how your body processes food and burns energy. Our tools give you a strong, evidence-based starting point — but real progress comes from tracking, adjusting, and listening to your body over time.

Nutrition & Fitness Terms We Cover

Our tools and content are built around the core language of nutrition science and fitness. If you are searching for answers related to any of the following concepts, you are in the right place:

  • Caloric intake and caloric deficit — the foundation of weight management
  • Macronutrients — protein, carbohydrates, and fats and their role in body composition
  • Micronutrients — vitamins and minerals that support metabolic function
  • Basal Metabolic Rate (BMR) and Resting Metabolic Rate (RMR)
  • Total Daily Energy Expenditure (TDEE) and Non-Exercise Activity Thermogenesis (NEAT)
  • Body Mass Index (BMI) and healthy weight range
  • Lean body mass, body fat percentage, and fat-free mass
  • Calorie surplus for muscle hypertrophy and lean bulking
  • Thermic Effect of Food (TEF) and its impact on daily calorie burn
  • Weight loss plateau, metabolic adaptation, and diet breaks
  • Macronutrient calculator, meal planning, and portion control
  • Physical activity level (PAL), sedentary lifestyle, and active lifestyle
  • One rep maximum (1RM), progressive overload, and strength standards

Our Mission

Health information should be accessible to everyone — not just people who can afford a nutritionist, a personal trainer, or a premium app subscription.

Our mission is simple: build the most accurate, most accessible, and most useful free nutrition and fitness tools on the internet. We will keep adding new tools, improving existing calculators, and expanding our content — all for free.

A Note on Medical Advice

Diet Planner provides educational health information and estimation tools only. Our content is not a substitute for professional medical advice, clinical diagnosis, or treatment from a qualified healthcare provider. If you have a medical condition, an eating disorder, or specific health concerns, please consult a registered dietitian, physician, or certified health professional before making significant changes to your diet or exercise routine.

Get Started

Ready to take control of your nutrition and fitness? Pick any tool from the menu and get your personalized result in under 60 seconds — no account required.

Have feedback, a tool suggestion, or spotted an error? We want to hear from you. Use the contact form or reach out directly — we read every message.