Health & Fitness
· Reviewed by Ali Abbas

Calorie & TDEE Calculator – Free Daily Calorie Needs Estimator

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How to Use the Calorie & TDEE Calculator

The CalkHub Calorie & TDEE Calculator uses the Mifflin-St Jeor equation — the most validated BMR formula in peer-reviewed nutrition science — to estimate your Total Daily Energy Expenditure and generate personalized calorie targets for weight loss, maintenance, or muscle gain. Enter your sex, age, weight, height, and activity level. All results update instantly and include BMR, TDEE, and four goal-based calorie targets with projected weekly outcomes.

How Many Calories Should I Eat to Lose Weight?

To lose approximately 0.5 kg (1 lb) per week, eat 500 calories per day below your TDEE. To lose 1 kg (2 lbs) per week — the maximum generally recommended without medical supervision — aim for a 1,000 calorie daily deficit. Never eat below your BMR without professional oversight; doing so risks muscle loss and metabolic adaptation. For most people, the "Moderate Loss" target in this calculator (TDEE minus 500) is the most sustainable starting point.

Understanding Your Maintenance Calories

Your TDEE (Total Daily Energy Expenditure) is the number of calories your body burns on a typical day when you factor in your activity level. It is your maintenance calorie level — eating exactly at your TDEE over time keeps your weight stable. TDEE is calculated by multiplying your Basal Metabolic Rate (BMR) by an activity multiplier:

  • Sedentary (×1.2): Desk job, no deliberate exercise. Most US adults fall here.
  • Lightly Active (×1.375): Walking or light gym sessions 1–3 days per week.
  • Moderately Active (×1.55): Purposeful exercise (gym, running, cycling) 3–5 days per week. Most active adults.
  • Very Active (×1.725): Hard training 6–7 days per week, or physical occupation plus exercise.
  • Extremely Active (×1.9): Twice-daily training, elite athlete level, or very demanding physical job.

What Is My TDEE at Sedentary Activity Level?

A sedentary 35-year-old woman at 65 kg and 165 cm has a BMR of approximately 1,404 kcal and a sedentary TDEE of approximately 1,685 kcal. A sedentary 35-year-old man at 85 kg and 178 cm has a BMR of approximately 1,890 kcal and a sedentary TDEE of approximately 2,268 kcal. Enter your exact stats above for your personalized figure.

TDEE Calculator Limitations and Accuracy Tips

TDEE calculators provide an evidence-based estimate, not a guarantee. The Mifflin-St Jeor equation predicts BMR within ±10% for most adults in controlled conditions. Real-world variation comes from several sources:

  • Activity level over-selection: Studies consistently show people overestimate their activity level. If unsure, select one level lower than you think and adjust based on your real-world results after 2–3 weeks.
  • Metabolic adaptation: As you lose weight, your TDEE decreases because a smaller body burns fewer calories. Recalculate every 4–6 weeks during active weight loss.
  • Non-exercise activity thermogenesis (NEAT): Fidgeting, standing, casual walking, and other unconscious movement can vary daily calorie burn by 100–500 kcal between individuals at the same body weight.
  • Formula limitations: Mifflin-St Jeor was validated primarily on adults aged 19–78. It may underestimate BMR for very muscular individuals and overestimate it for those with very high body fat percentages.

How Accurate Are Online TDEE Calculators?

A meta-analysis in the Journal of the Academy of Nutrition and Dietetics found that the Mifflin-St Jeor equation predicted measured resting energy expenditure within ±10% for 82% of participants — making it the most accurate of the major predictive equations for most adults. The Harris-Benedict equation (the older alternative) tends to overestimate by 5–15% in sedentary populations. The real accuracy test is tracking: if your weight is stable eating at your calculated TDEE, the estimate is accurate for you.

Calorie Adjustments for Weight Loss or Muscle Gain

Once you have your TDEE, creating your target is straightforward. For fat loss, subtract 300–500 calories for a moderate deficit; subtract 500–750 for an aggressive cut. For muscle gain (lean bulk), add 200–500 calories above TDEE combined with a progressive resistance training program — a smaller surplus minimizes fat gain while still supporting hypertrophy. Calorie cycling (eating more on training days, less on rest days) is an advanced strategy some find helpful once the basics are consistent. Regardless of goal, protein intake of 1.6–2.2 g per kg of body weight is recommended to preserve or build muscle mass during any phase.

How to Use

  1. 1
    Step 1 — Enter Your Personal DetailsSelect your sex and enter your age, weight, and height. Switch between Imperial (lbs/ft+in) and Metric (kg/cm) using the toggle at the top. All values update results instantly.
  2. 2
    Step 2 — Select Activity Level & FormulaChoose the activity level that best describes your typical week — not your best week. If you have a sedentary job and exercise 3 days per week with moderate intensity, select 'Moderately Active'. Use the formula dropdown to compare Mifflin-St Jeor (recommended for most adults) against Harris-Benedict (the classic alternative).
  3. 3
    Step 3 — Read Your TDEE and Goal TargetsYour TDEE (maintenance calories) appears in the primary card. Below it, four goal-based daily calorie targets are shown: Aggressive Loss (−1 kg/week), Moderate Loss (−0.5 kg/week), Maintenance, and Lean Bulk (+0.25 kg/week). Use these as starting points and adjust based on 2–3 weeks of real tracking data.

Medical Disclaimer: Calorie and TDEE estimates are based on validated predictive equations and are intended for informational purposes only. Individual metabolic rates vary — use results as a starting point and adjust based on real-world outcomes over 2–3 weeks. Consult a registered dietitian, physician, or qualified healthcare provider before making significant changes to your calorie intake, especially if you have a medical condition, history of disordered eating, or are pregnant or breastfeeding.

Frequently Asked Questions

How does this Calorie & TDEE Calculator differ from basic BMR tools?
This calculator goes beyond BMR by multiplying your basal metabolic rate by an activity level multiplier to give your Total Daily Energy Expenditure (TDEE) — the actual calories you burn on a typical day. It then generates four goal-specific calorie targets (aggressive loss, moderate loss, maintenance, and lean bulk) and supports both the Mifflin-St Jeor and Harris-Benedict formulas so you can compare results.
What activity level should I select for a desk job plus gym 3 times per week?
Select 'Moderately Active' (×1.55) for a desk job combined with purposeful gym sessions 3–5 days per week. If your gym sessions are light (30 minutes, low intensity), consider 'Lightly Active' (×1.375). Studies consistently show people overestimate their activity level, so if you're not seeing expected results, drop one level and adjust based on 2–3 weeks of real tracking data.
How often should I recalculate my TDEE as I lose weight?
Recalculate every 4–6 weeks during active weight loss. As your body weight decreases, your BMR and TDEE both decrease — meaning your maintenance calories drop. Continuing to eat at your original deficit without recalculating is one of the most common reasons weight loss plateaus. A 10-kg loss in a typical adult reduces TDEE by approximately 150–250 kcal/day.
What formula does this Calorie & TDEE Calculator use?
The default formula is Mifflin-St Jeor (1990), which is validated by a landmark study in the Journal of the American Dietetic Association as the most accurate predictive equation for most adults. The alternative is Harris-Benedict (revised 1984), an older formula that tends to overestimate BMR by 5–15% in sedentary individuals. You can toggle between both formulas in the calculator to compare your results.
Is TDEE the same as maintenance calories?
Yes — TDEE and maintenance calories are the same number. TDEE (Total Daily Energy Expenditure) represents all calories burned in a day (base metabolism plus all movement and activity). Eating at your TDEE over time maintains your current body weight. Eating below TDEE creates a deficit for fat loss; eating above it creates a surplus for weight gain.
What is a safe daily calorie deficit for fat loss?
A deficit of 300–500 calories per day is considered moderate and safe for most healthy adults, producing approximately 0.3–0.5 kg (0.6–1 lb) of fat loss per week. A 500–750 calorie deficit is on the aggressive end. Deficits larger than 1,000 kcal/day are not recommended without medical supervision, as they risk muscle loss, micronutrient deficiency, and metabolic adaptation. Avoid eating below your BMR.
Why do my TDEE results vary across different websites?
TDEE results vary across tools because of three factors: which BMR formula they use (Mifflin-St Jeor, Harris-Benedict, Katch-McArdle, or Cunningham), how they define activity multipliers (the exact multiplier values differ slightly between sources), and whether they round intermediate values. Differences of 50–150 kcal/day between calculators using the same inputs are normal and within the margin of measurement error for any predictive formula.
How do I use TDEE for muscle building goals?
To build muscle, eat in a caloric surplus of 200–500 kcal above your TDEE combined with a progressive resistance training program. A smaller surplus (200–275 kcal) is a 'lean bulk' approach that minimizes fat gain while still supporting hypertrophy. Prioritize protein intake at 1.6–2.2 g per kg of body weight. The 'Lean Bulk' card in this calculator adds 275 kcal above your TDEE as a conservative starting point.
Does the calculator adjust calories for women in perimenopause or menopause?
The Mifflin-St Jeor formula includes age and sex as variables, so it naturally produces lower calorie estimates for older women compared to younger women at the same weight and height — reflecting real metabolic changes. However, it does not specifically model hormonal changes from perimenopause or menopause. Women experiencing significant metabolic or body composition changes during this period should work with a registered dietitian for individualized recommendations.
Can this calculator account for strength training versus cardio?
The activity multiplier covers total weekly exercise volume rather than type. Both strength training and cardio are captured through your selected activity level. However, strength training tends to be more effective at preserving BMR during a calorie deficit (by maintaining muscle mass), so the same TDEE estimate can support different body composition outcomes depending on training type. For precision, choose your activity level based on total weekly exercise sessions and intensity.
How many calories per day do I need to maintain my weight?
Your daily calorie maintenance needs equal your TDEE, which this calculator computes from your personal inputs. As a general population reference: the 2020–2025 Dietary Guidelines for Americans estimate 2,200–2,400 kcal/day for active women and 2,600–3,000 kcal/day for active men — but these are population averages. Your actual TDEE may be meaningfully above or below these ranges depending on your specific body size, age, and activity.
What is the minimum safe calorie intake?
The generally accepted minimum calorie intake is 1,200 kcal/day for women and 1,500 kcal/day for men, below which meeting micronutrient needs becomes very difficult and muscle loss risk increases significantly. Going below these thresholds should only be done under medical and dietetic supervision. This calculator soft-floors aggressive deficit targets at 80% of your BMR to avoid generating clinically unsafe numbers.
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Formula & data source: Mifflin MD, St Jeor ST et al. (1990) — PubMed