Daily calorie intake target
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calories per day
Enter your stats, pick your goal weight-loss pace — get your daily calorie target, TDEE and projected timeline instantly.
A calorie deficit occurs when you consume fewer calories than your body burns in a day. This gap forces your body to draw on stored energy — primarily body fat — to make up the shortfall. It is the single most important mechanism behind fat loss, regardless of which diet or exercise plan you follow.
Understanding your calorie deficit requires knowing two key numbers: your Basal Metabolic Rate (BMR) — the calories your body needs just to stay alive at rest — and your Total Daily Energy Expenditure (TDEE), which adds calories burned through physical activity, digestion (the thermic effect of food) and non-exercise activity thermogenesis (NEAT). Once you know your TDEE, you can set your intake below it to create a controlled deficit.
This calculator uses the Mifflin-St Jeor equation, which a 2005 meta-analysis in the Journal of the American Dietetic Association confirmed is the most accurate formula for estimating resting energy expenditure across body weight categories.
| Level | Multiplier | Example |
|---|---|---|
| Sedentary | 1.20 | Desk job, no structured exercise |
| Lightly active | 1.375 | Light exercise 1–3 days/week |
| Moderately active | 1.55 | Moderate exercise 3–5 days/week |
| Very active | 1.725 | Hard training 6–7 days/week |
| Extra active | 1.90 | Very hard training + physical job |
The size of your calorie deficit directly controls how fast you lose weight — and the risks involved. Research consistently supports a moderate deficit of 300–500 kcal per day as the optimal range for most people. At this level, you lose approximately 0.3–0.5 kg of fat per week while preserving muscle mass, maintaining energy levels, and meeting nutritional needs without requiring extreme dietary restriction.
Larger deficits of 750–1,000 kcal per day produce faster initial results but come with trade-offs: increased muscle catabolism, hormonal disruption, fatigue, heightened hunger and a greater risk of nutrient deficiencies. The body also adapts to severe restriction by lowering metabolic rate — a phenomenon called adaptive thermogenesis — which progressively reduces the effectiveness of the deficit over time.
Minimum safe calorie floors are 1,200 kcal/day for women and 1,500 kcal/day for men. Below these thresholds it becomes very difficult to obtain adequate protein, vitamins and minerals. This calculator automatically enforces these minimums and adjusts your projected rate accordingly.
When you eat in a deficit, your body does not exclusively burn fat — it also breaks down muscle tissue for energy, especially if protein intake is low or the deficit is large. Protecting lean mass is critical because muscle is metabolically active tissue: every kilogram of muscle burns approximately 13–20 kcal per day at rest. Losing muscle makes your deficit harder to maintain and slows future fat loss.
The three most effective strategies for muscle preservation during fat loss are: (1) High protein intake — consume 1.6–2.2 g of protein per kilogram of body weight per day. Studies by Helms et al. and Phillips et al. confirm this range is optimal for lean mass retention during calorie restriction. (2) Resistance training — strength training 2–4 times per week sends a signal to preserve muscle. Even bodyweight exercises are sufficient. (3) Avoid extreme deficits — larger deficits accelerate muscle breakdown. The 500 kcal/day threshold is the widely cited tipping point above which muscle loss increases significantly.
Most people experience rapid initial weight loss followed by a slowdown or plateau. Several mechanisms explain this. First, as you lose weight your TDEE decreases — a lighter body simply burns fewer calories. A deficit that was 500 kcal in week one may shrink to 300 kcal by week twelve because your baseline energy needs have fallen. Second, metabolic adaptation — also called "starvation mode" — causes a modest additional reduction in metabolic rate beyond what body weight alone would predict. Research estimates this adaptive thermogenesis reduces TDEE by an extra 50–150 kcal/day during sustained calorie restriction.
Water retention is another confounding factor. Changes in carbohydrate intake, increased cortisol from dieting stress and normal hormonal fluctuations can cause 1–3 kg of water weight variation on the scale, masking real fat loss. The best approach to a plateau is to recalculate your TDEE at your current weight, increase physical activity (NEAT is particularly effective — taking 2,000 more steps daily adds roughly 80–100 kcal burned), and allow 2–3 weeks before making further adjustments.
| Goal | Daily deficit | Weekly loss | Best for |
|---|---|---|---|
| Gentle recomposition | 250 kcal | ~0.25 kg (0.5 lb) | Athletes, minimal fat to lose |
| Standard fat loss | 500 kcal | ~0.45 kg (1 lb) | Most people — best balance |
| Faster fat loss | 750 kcal | ~0.7 kg (1.5 lb) | Short-term, high protein essential |
| Maximum deficit | 1,000 kcal | ~1 kg (2 lb) | Only with medical oversight |
1 kg of body fat ≈ 7,700 kcal. Individual results vary based on body composition, hormones and adherence.
Both matter — but in different proportions. Research consistently shows that dietary changes are responsible for approximately 75–80% of weight loss outcomes, while exercise contributes the remaining 20–25%. This is partly because exercise is harder to sustain in large volumes and partly because appetite hormones respond to exercise in complex ways — many people feel hungrier after cardio and unknowingly compensate by eating more.
That said, exercise plays a crucial role beyond calorie burn: it preserves muscle mass, improves insulin sensitivity, reduces appetite-regulating hormone dysregulation and provides mental health benefits that support long-term adherence. The most evidence-based combination for sustained fat loss is a 300–400 kcal dietary deficit paired with 150–250 minutes of moderate exercise per week, particularly a mix of cardiovascular exercise and resistance training.
Non-exercise activity thermogenesis (NEAT) — the calories burned through everyday movement like walking, fidgeting and standing — is often underrated. NEAT can vary by up to 700 kcal per day between individuals at the same body weight, making it a powerful but often overlooked lever. Small habit changes such as using stairs, standing at a desk, or adding a 20-minute walk after dinner can contribute meaningfully to a calorie deficit without the structured time commitment of formal exercise.
A calorie deficit means consuming fewer calories than your body burns per day. The gap forces your body to use stored fat for energy, producing weight loss. A deficit of 7,700 kcal equates to roughly 1 kg (2.2 lb) of fat lost.
Most experts recommend a deficit of 300–500 kcal per day for safe, sustainable loss of 0.3–0.5 kg per week. Deficits above 750 kcal/day increase the risk of muscle loss, fatigue and nutrient deficiencies. This calculator enforces minimum safe floors of 1,200 kcal (women) and 1,500 kcal (men).
TDEE (Total Daily Energy Expenditure) is the total calories you burn per day including rest, digestion and all physical activity. It equals your BMR multiplied by an activity factor. Your daily intake target = TDEE minus your chosen deficit.
Men: BMR = (10 × kg) + (6.25 × cm) − (5 × age) + 5. Women: BMR = (10 × kg) + (6.25 × cm) − (5 × age) − 161. A 2005 review confirmed this is the most accurate BMR formula for most adults, beating the older Harris-Benedict equation.
Some muscle loss is possible without protective measures. To minimize it: eat 1.6–2.2 g of protein per kg of body weight, do resistance training 2–4 times per week, and keep your daily deficit at or below 500 kcal. High protein intake is the single most important factor.
As you lose weight, your TDEE decreases — meaning your original deficit shrinks over time. Recalculate at your new weight, increase NEAT (daily steps), and ensure your food tracking is accurate. Metabolic adaptation also reduces TDEE by an extra 50–150 kcal/day during prolonged restriction.
It depends on your individual TDEE. Most adults have a TDEE of 1,800–2,500 kcal/day. Subtract 500 kcal for a standard deficit, giving a target of 1,300–2,000 kcal/day. Never go below 1,200 (women) or 1,500 (men) without medical supervision.
At a 500 kcal/day deficit you lose approximately 0.45 kg (1 lb) per week, or about 2 kg per month. The first 1–2 weeks often show faster loss due to water and glycogen depletion, after which fat loss becomes the primary driver.