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Calorie Calculator

Find your exact daily calorie target based on your age, height, weight and activity level. Includes TDEE, BMR, and a full protein/carbs/fat macro split. Powered by the Mifflin-St Jeor formula.

Your Details

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Enter your details to get your calorie target

Fill in the form and tap Calculate My Calories to get your personalised daily calorie needs.

How This Calculator Works

This calculator uses the Mifflin-St Jeor equation: the formula recommended by the Academy of Nutrition and Dietetics as the most accurate predictor of Basal Metabolic Rate for the general population.

Step 1: Calculate BMR

Men: BMR = 10 Γ— weight(kg) + 6.25 Γ— height(cm) βˆ’ 5 Γ— age + 5
Women: BMR = 10 Γ— weight(kg) + 6.25 Γ— height(cm) βˆ’ 5 Γ— age βˆ’ 161

Step 2: Apply Activity Multiplier

TDEE = BMR Γ— Activity Factor (1.2 to 1.9)

Step 3: Adjust for Goal

A calorie deficit of 500 kcal/day produces approximately 0.5 kg of weight loss per week. A surplus of 500 kcal/day produces approximately 0.5 kg of gain per week.

Understanding TDEE vs BMR

BMR (Basal Metabolic Rate) is the number of calories your body needs at complete rest to maintain basic functions: breathing, circulation, cell repair. It represents the minimum energy expenditure just to stay alive.

TDEE (Total Daily Energy Expenditure) is your BMR multiplied by an activity factor. It represents the total calories you burn in a real day including movement, exercise, and digestion. This is the number to target for maintaining your current weight.

Activity LevelFactorExample
SedentaryΓ— 1.2Desk job, no planned exercise
Lightly ActiveΓ— 1.375Walking, light gym 1–3 days/week
Moderately ActiveΓ— 1.55Gym 3–5 days/week, active job
Very ActiveΓ— 1.725Daily hard training, sports
Extra ActiveΓ— 1.9Manual labour + twice-daily training

Frequently Asked Questions

How accurate is this calorie calculator?
The Mifflin-St Jeor equation is within Β±10% for most people. Accuracy depends on how precisely you estimate your activity level. Track your actual intake and adjust after 2–3 weeks if weight isn't moving as expected.
Should I eat below my BMR?
Eating significantly below your BMR for extended periods can trigger muscle loss and metabolic adaptation. Most nutritionists recommend staying above 1,200 kcal for women and 1,500 kcal for men, even during aggressive cuts.
What macros should I aim for?
This calculator uses a 30/40/30 split (protein/carbs/fat) as a balanced starting point. Athletes or those with specific goals may benefit from different ratios: consult a registered dietitian for a personalised macro plan.
Why is my calculated TDEE different from other calculators?
Different calculators use different formulas (Harris-Benedict, Katch-McArdle, etc.). This site uses the Mifflin-St Jeor equation, which peer-reviewed research consistently finds to be the most accurate for most people without known body fat percentage data.
Disclaimer: Calorie calculations are estimates. Individual metabolism varies. Consult a registered dietitian or doctor before making significant changes to your diet.
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FCALCULATOR Health Team
Last reviewed
Formula validated against NIH and Academy of Nutrition and Dietetics recommendations. Reviewed annually.