Which calorie formula is most accurate?

Mifflin-St Jeor is recommended by the Academy of Nutrition and Dietetics as the most accurate for the general population. Katch-McArdle may be more accurate for lean athletes who know their body fat %.

How do I choose my activity level?

Be honest about your total daily activity, not just exercise. Sedentary = desk job, minimal movement. Light = 1-3 workouts/week. Moderate = 3-5 workouts. Active = daily exercise. Very Active = 2x/day or physical labor.

Should I eat the same calories every day?

Consistency is simplest, but some prefer calorie cycling (higher on training days, lower on rest days). The weekly total matters more than any single day.

Calorie Intake Calculator

Name: Calorie Intake Calculator
Author: Manish Kumar

How Many Calories Do You Need?

This calculator estimates your daily calorie needs using established BMR formulas and activity multipliers. It provides a single, goal-adjusted calorie target with macro breakdown — designed as the unified "how many calories should I eat" tool ^[1].

For formula-specific deep dives, see our Mifflin-St Jeor Calculator or Harris-Benedict Calculator.

BMR Formulas Compared

Mifflin-St Jeor (default): Most accurate for the general population according to multiple validation studies ^[2]
Harris-Benedict: The classic formula, tends to slightly overestimate compared to Mifflin-St Jeor
Katch-McArdle: Uses lean body mass, making it more accurate for athletes with known body fat percentage

Goal Adjustments

The goal multiplier adjusts your maintenance TDEE by a percentage:

Maintain (0%): Eat at maintenance calories
Mild Surplus (+10–15%): For gradual lean mass building
Moderate Surplus (+20%): For focused bulking phases
Mild Deficit (−15%): Sustainable reduction pace
Moderate Deficit (−20%): More aggressive, requires adequate protein

For more detailed deficit planning, see our Calorie Deficit Calculator. For macro-specific calculators, see Protein Calculator and Carb Calculator.

How to Use This Calculator

Enter your sex, age, height, and weight
Choose a BMR formula (Mifflin-St Jeor recommended for most)
Select your activity level and goal
Set meals per day for per-meal calorie targets
Click "Calculate Daily Calories" for your personalized plan

Frequently Asked Questions

Sources & References

Predictive Equations for BMR and Energy Expenditure. Mifflin MD, et al.. American Journal of Clinical Nutrition (1990)
Dietary Reference Intakes for Energy. Institute of Medicine. National Academies Press (2005)
Analysis of Daily Calorie Requirements. ResearchGate. Nutrition Research (2024)

Manish Kumar

Certified Personal Trainer & Sports Nutritionist

NASM-CPTCertified Sports Nutritionist10+ Years Experience500+ Clients Coached

NASM-certified fitness and nutrition coach with over 10 years of hands-on experience helping people build strength, lose fat, and live healthier lives. Specializing in gym-based workouts with a strong focus on lifting technique, biomechanics, and practical exercise science. Through FitLifeRegime, sharing the tools, tips, and insights that have worked for hundreds of clients — helping you start your own fitness journey with confidence and clarity.

Learn more about Manish

NASM Certified

Certified Personal Trainer & Sports Nutritionist from the National Academy of Sports Medicine

Disclaimer: This calculator is for informational and personal awareness purposes only. Results are estimates based on published formulas and may not reflect your exact measurements or outcomes.