Calculate how many calories you need per day to lose, maintain, or gain weight. Simple interface with goal-based targets, macro breakdown, and food calorie reference.
Knowing how many calories you need per day is the foundation of any weight management plan. Whether your goal is fat loss, muscle gain, or simply maintaining your current weight, your daily calorie target determines success or failure. This simple calculator uses the Mifflin-St Jeor equation — the most accurate BMR formula for most adults — combined with your activity level to estimate your Total Daily Energy Expenditure (TDEE).
From your TDEE, the calculator generates ready-to-use calorie targets for six different goals: aggressive fat loss (−750 kcal/day), moderate loss (−500), mild loss (−250), maintenance, lean gain (+250), and bulk (+500). It also accepts an optional goal weight and timeline, automatically computing the daily calorie target needed to reach that goal safely. A minimum calorie floor (1,500 for men, 1,200 for women) ensures the recommendation stays within safe bounds.
The included macro breakdown shows how to split those calories across protein (30%), carbohydrates (40%), and fat (30%) — a balanced ratio that supports satiety, muscle preservation, and energy. A common food calorie reference table shows how everyday foods stack up as a percentage of your budget, helping you make informed choices without consulting an app for every meal.
This calculator distills the science of energy balance into a straightforward tool: enter a few numbers, get your calorie targets for every goal. No jargon, no complexity — just actionable numbers you can start using today. Keep these notes focused on your operational context. Tie the context to the calculator’s intended domain. Use this clarification to avoid ambiguous interpretation.
BMR (Mifflin-St Jeor): Males = 10×weight(kg) + 6.25×height(cm) − 5×age + 5; Females = same − 161. TDEE = BMR × Activity Factor. Weight loss: 1 lb ≈ 3,500 kcal deficit. Moderate loss (−1 lb/wk) = TDEE − 500 kcal/day.
Result: Maintenance: 2,636 kcal/day; Moderate loss: 2,136 kcal/day
A 30-year-old moderately active male has a BMR of ~1,756 kcal and TDEE of ~2,636 kcal. For a 1 lb/week loss, he needs a 500 kcal deficit: 2,136 kcal/day. At this level, macros split to ~160g protein, ~214g carbs, ~71g fat.
The classic rule — 3,500 calories = 1 pound of fat — is a useful rough guide but oversimplifies biology. As you lose weight, metabolic rate decreases, NEAT decreases, and hormones (leptin, ghrelin) shift to promote hunger and energy conservation. The actual deficit needed to lose subsequent pounds increases over time. Dynamic models (like the NIH Body Weight Planner) account for these adaptations, but for practical purposes, recalculating every 10 lbs keeps the simple model workable.
Very low calorie diets (VLCDs, <1,200 kcal) cause rapid initial weight loss but almost always trigger: (1) significant muscle loss (25–50% of weight lost), (2) metabolic adaptation far beyond what weight loss predicts, (3) hormonal disruption (menstrual irregularity, low testosterone, thyroid downregulation), and (4) psychological rebound leading to weight regain. The Biggest Loser studies showed contestants' BMR dropped 500+ kcal below predicted even 6 years later.
Both approaches can work, but they serve different phases. Calorie counting is most valuable when starting out — it builds portion awareness and reveals hidden calories. After 3–6 months, many people transition to intuitive eating informed by their tracking experience. The key insight is that you don't need to track forever, but everyone should track at least once to calibrate their internal portion sense.
Most people need a 500 kcal/day deficit (about 1 lb/week loss). Find your maintenance calories and subtract 500. Never go below 1,500 (men) or 1,200 (women) without medical supervision. Slower loss (250 deficit) is more sustainable and preserves more muscle.
For pure weight change, yes — a calorie is a calorie. But for body composition, satiety, and health, food quality matters enormously. 200 calories of chicken breast (high protein, high satiety, high TEF) is metabolically different from 200 calories of soda (no protein, low satiety, minimal TEF).
0.5–1.0% of body weight per week is the evidence-based safe range. For most people, that is 1–2 lbs/week. Faster loss increases muscle loss, nutrient deficiencies, gallstone risk, and metabolic adaptation.
The three most common reasons: (1) underestimating calorie intake (studies show people underreport by 30–50%), (2) overestimating activity level, (3) metabolic adaptation after several weeks of dieting. Solution: track meticulously for 2 weeks, then adjust by 100–200 kcal.
TEF is the energy cost of digesting food — about 10% of total calories. Protein has the highest TEF (20–30%), carbs 5–10%, fat 0–3%. This is one reason high-protein diets are effective — you burn more calories processing protein.
Generally, no — or eat back only 50% of them. Exercise calorie estimates (from watches, machines) are notoriously inaccurate (up to 50% overestimation). Your activity factor already accounts for general exercise. Competitive athletes may need to eat back more.