Calorie Calculator

Calculate your total daily energy expenditure (TDEE) and find the right calorie targets for your goals.

About Calorie Calculator

This calorie calculator uses the Mifflin-St Jeor equation, one of the most accurate formulas for estimating your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE). By accounting for your weight, height, age, gender, and activity level, it provides personalized calorie targets for maintenance, weight loss, and weight gain. Whether you're looking to lose weight, build muscle, or maintain your current physique, knowing your daily energy needs is the first step toward achieving your goals.

Mifflin-St Jeor Formula

Uses the clinically validated Mifflin-St Jeor equation, considered the gold standard for BMR estimation by nutrition experts.

5 Activity Levels

Choose from sedentary to extremely active to get a TDEE that accurately reflects your lifestyle and exercise habits.

Weight Goals

Get calorie targets for three goals: maintenance, weight loss (-500 kcal), and weight gain (+500 kcal) in one calculation.

Science-Based

Built on peer-reviewed research and widely used by dietitians, nutritionists, and fitness professionals worldwide.

📋 Common Use Cases

Quick Calculations

Get instant, accurate results without searching for formulas or opening spreadsheet software.

Verify Your Work

Double-check manual calculations for important financial, academic, or professional decisions.

Plan & Budget

Use calculated figures to make informed plans — whether budgeting, investing, or tracking personal metrics.

Privacy-Safe Computing

All calculations run in your browser. Your numbers and personal data never leave your device.

🪜 How to Use This Tool

  1. Enter your values
    Input your numbers into the clearly labeled fields. Most calculators support both whole numbers and decimals.
  2. Adjust optional settings
    Configure any available options like units, compounding frequency, or calculation method to match your scenario.
  3. Review your results
    Results appear instantly as you type. Key metrics are highlighted with supporting details and breakdowns.
  4. Use your results
    Copy, screenshot, or bookmark the results. All data stays in your browser — nothing is saved or shared.

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Frequently Asked Questions

Are these calculators really free?▼
Yes. All calculators on iluv.tools are completely free. No signup, no account, no credit card required. Every calculation runs instantly in your browser.
Is my data sent anywhere?▼
Absolutely not. All calculators are pure client-side JavaScript. Your numbers, dates, and inputs never leave your browser. No server processing, no tracking.
How accurate are these calculators?▼
Calculators use standard mathematical formulas with double-precision floating point. Results match industry-standard financial and scientific calculations.
Can I use calculators on mobile?▼
Yes. All calculators work on mobile browsers (iOS Safari, Android Chrome) with responsive layouts.