SnapCalc

Calorie & Macros Calculator (TDEE)

Calculate your Total Daily Energy Expenditure (TDEE), ideal calorie intake, and macronutrient targets for your goal.

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How to Use This Calorie & Macros Calculator

This calculator uses the Mifflin-St Jeor equation — the most accurate BMR formula for general populations — to estimate your daily calorie needs and macronutrient targets.

  • Biological Sex — the formula differs slightly for males and females
  • Age, Weight, Height — enter in years, kilograms, and centimetres
  • Activity Level — be honest here; most people overestimate this and wonder why they’re not losing weight
  • Goal — lose weight (500 cal deficit), maintain, or gain muscle (300 cal surplus)
  • Understanding Your Results

  • TDEE — Total Daily Energy Expenditure, the calories you burn on a typical day
  • Daily Calorie Target — adjusted up or down from TDEE based on your goal
  • Protein — 2g per kg of bodyweight, supporting muscle retention in a deficit or growth in a surplus
  • Fat — 25% of total calories, the minimum for hormonal health and fat-soluble vitamin absorption
  • Carbohydrates — the remaining calories after protein and fat are allocated
  • Activity Level Guide

  • Sedentary — desk job, no intentional exercise
  • Lightly Active — walking, 1–2 gym sessions per week
  • Moderately Active — 3–5 structured workouts per week
  • Very Active — daily training, physical work
  • Extra Active — twice-daily training or a highly physical job combined with exercise
  • How Fast Should You Lose Weight?

    A 500 calorie daily deficit creates roughly a 0.5kg loss per week. This pace is sustainable and preserves muscle mass. Cutting more than 750–1,000 calories risks muscle loss, fatigue, and rebound eating.

    Formula

    BMR (Mifflin-St Jeor): Male = 10W + 6.25H − 5A + 5 | Female = 10W + 6.25H − 5A − 161 | TDEE = BMR × Activity Multiplier

    Frequently Asked Questions

    What is TDEE?

    Total Daily Energy Expenditure is the total calories your body burns in a day, including your basal metabolic rate and all physical activity. Eating below your TDEE creates a deficit for fat loss; above it creates a surplus for muscle gain.

    How accurate is this calculator?

    The Mifflin-St Jeor formula is within ±10% for most people. Use the result as a starting point, then adjust based on 2–3 weeks of real-world data. If you’re not losing weight at the calculated deficit, reduce calories by 100–200.

    How much protein do I actually need?

    For body composition goals, 1.6–2.2g per kg of bodyweight is the evidence-based range. This calculator uses 2g/kg, which is sufficient whether you’re cutting or bulking and helps preserve lean muscle during a calorie deficit.

    Do I need to hit my macros exactly every day?

    No — consistency over a week matters more than perfection on any single day. Aim to hit your protein target daily (most impactful), and let carbs and fat flex based on your food choices.

    Should I eat back exercise calories?

    If you selected an accurate activity level, your exercise is already factored into your TDEE. Only eat back calories if you did significantly more exercise than your activity level assumes — and even then, only partially, as calorie burn estimates are often inflated.

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