How Many Calories Should I Eat Per Day?

"How many calories should I eat per day?" is one of the most searched nutrition questions on the internet — and the answer is genuinely different for every person. Generic advice like "eat 2,000 calories" ignores the factors that actually determine your needs: body size, age, sex, activity level, and your goal. This guide walks you through how to find your personal number.

General calorie guidelines by age and gender

The following ranges come from dietary guidelines and apply to moderately active individuals at average heights and weights. They are starting points, not personal prescriptions.

• Men aged 19–30: 2,600–2,800 calories/day
• Men aged 31–50: 2,400–2,600 calories/day
• Men aged 51+: 2,200–2,400 calories/day
• Women aged 19–30: 2,000–2,200 calories/day
• Women aged 31–50: 1,800–2,000 calories/day
• Women aged 51+: 1,600–1,800 calories/day

These figures decrease as we age primarily because muscle mass naturally decreases, lowering the basal metabolic rate.

How to find your personal calorie target in 3 steps

Step 1: Calculate your BMR (Basal Metabolic Rate) using the Mifflin-St Jeor equation:

• Men: BMR = (10 × kg) + (6.25 × cm) – (5 × age) + 5
• Women: BMR = (10 × kg) + (6.25 × cm) – (5 × age) – 161

Step 2: Multiply by your activity level to get your TDEE (maintenance calories):

• Sedentary (desk job, no exercise): × 1.2
• Lightly active (1–3 workouts/week): × 1.375
• Moderately active (3–5 workouts/week): × 1.55
• Very active (6–7 workouts/week): × 1.725

Step 3: Adjust for your goal:

• Weight loss: TDEE – 300 to 500 calories
• Maintenance: TDEE
• Muscle gain: TDEE + 200 to 300 calories

Worked example – 35-year-old man, 80 kg, 178 cm, lightly active

BMR = (10 × 80) + (6.25 × 178) – (5 × 35) + 5 = 800 + 1,112.5 – 175 + 5 = 1,742.5 calories

TDEE = 1,742.5 × 1.375 = 2,396 calories/day to maintain weight

For gradual weight loss: 2,396 – 400 = 1,996 calories/day

Why 1,200 calories is too low for most people

Many popular diet plans default to 1,200 calories for women and 1,500 for men. For most adults, these levels are below what's needed to meet daily protein, vitamin, and mineral requirements without supplementation. Eating at these levels long-term leads to muscle loss, fatigue, hair thinning, hormonal disruption, and metabolic slowdown. A 300–500 calorie deficit from your TDEE is almost always preferable to an arbitrary low ceiling.

Calories are not equal – food quality matters

Two people can eat the same calorie amount with dramatically different health outcomes depending on what those calories come from. 1,800 calories from whole foods (vegetables, lean proteins, whole grains, healthy fats) supports energy, gut health, and satiety. 1,800 calories from ultra-processed foods (chips, biscuits, sugary drinks) may meet the calorie target but causes hunger, blood sugar swings, and nutritional gaps.

How hunger, weight loss speed, and adherence interact

The best calorie target is one you can actually maintain for months. Extreme deficits (800–1,000 calories below TDEE) produce fast initial results but are almost universally abandoned due to hunger, fatigue, and social friction. A moderate 300–500 calorie deficit creates progress you can sustain for 12–24 weeks — which produces better long-term outcomes even if the weekly loss looks slower.

Calorie cycling – a flexible approach

Rather than eating the same number of calories every day, some people prefer calorie cycling — eating more on workout days and less on rest days, while the weekly average still hits the target deficit. This approach can improve workout performance and reduce the monotony of rigid daily targets.

Frequently asked questions about daily calorie intake

How many calories should I eat to lose weight? Eat 300–500 fewer calories than your TDEE per day. This creates approximately 0.3–0.5 kg of fat loss per week — sustainable and realistic.

How many calories should an average woman eat per day? Most moderately active women need 1,800–2,200 calories per day to maintain weight. This varies significantly with size and activity level.

Is 1,200 calories a day enough? For most adults, 1,200 calories is below the minimum to meet nutritional needs. It is not recommended as a long-term approach unless supervised by a doctor or dietitian.

Why there is no single answer

The frequently cited "2,000 calories for women, 2,500 for men" is a population average designed for food labelling purposes — not a prescription for any individual. Your personal calorie requirement depends on your specific height, weight, age, body composition, activity level, and goal. Using a generic figure without personalising it is one of the most common reasons people's calorie targets fail to produce the expected results.

Your personalised calorie target in three steps

Step 1 — Find your BMR (Mifflin-St Jeor equation, most validated for adults):

• Men: BMR = (10 × weight kg) + (6.25 × height cm) – (5 × age) + 5
• Women: BMR = (10 × weight kg) + (6.25 × height cm) – (5 × age) – 161

Step 2 — Multiply by activity factor to get TDEE (maintenance calories):

• Sedentary: × 1.2 | Lightly active: × 1.375 | Moderately active: × 1.55 | Very active: × 1.725

Step 3 — Adjust for goal:

• Fat loss: TDEE – 300 to 500 calories
• Maintenance: eat at TDEE
• Lean muscle gain: TDEE + 200 to 300 calories with high protein

Worked example — 40-year-old man, 85 kg, 180 cm, lightly active:

BMR = (850 + 1125 – 200 + 5) = 1780. TDEE = 1780 × 1.375 = 2447 cal. Fat loss target: 2447 – 400 = 2,047 calories/day

Recommended daily calorie intake by age and gender

• Men 19–30: 2,600–2,800 kcal (moderately active)
• Men 31–50: 2,400–2,600 kcal (moderately active)
• Men 51+: 2,200–2,400 kcal (moderately active)
• Women 19–30: 2,000–2,200 kcal (moderately active)
• Women 31–50: 1,800–2,000 kcal (moderately active)
• Women 51+: 1,600–1,800 kcal (moderately active)

These decline with age primarily because lean muscle mass decreases with age (sarcopenia), which lowers BMR. Resistance training is the most effective strategy to preserve metabolic rate as you age.

Why the 1,200-calorie myth is harmful

Many popular diet apps and plans default to 1,200 calories for women. For the average adult woman with a TDEE of 1,800–2,200 calories, eating 1,200 creates an extreme deficit of 600–1,000 calories per day. While this produces rapid initial weight loss, it comes with serious costs: accelerated muscle loss (which permanently lowers metabolic rate), nutrient deficiencies requiring supplementation, fatigue, hair thinning, disrupted menstrual cycles, and a high rebound rate when the diet ends.

A 300–500 calorie deficit from your TDEE produces 0.3–0.5 kg of fat loss per week — slower but sustainable, with muscle preserved and adherence dramatically higher.

Macronutrient priorities within your calorie target

• Protein first (1.6–2.2 g/kg bodyweight): Preserves muscle during fat loss, most satiating macronutrient, highest thermic effect
• Fat second (0.8–1 g/kg minimum): Essential for hormonal health, fat-soluble vitamin absorption, satiety
• Carbohydrates with remaining calories: Primary fuel for high-intensity exercise and brain function; prioritise quality (vegetables, whole grains, fruit) over processed sources

Calorie cycling — a flexible alternative

Rather than eating the same calories daily, calorie cycling eats more on training days and less on rest days while the weekly average stays at the target deficit. On a 2,000-calorie average: 2,300 on 3 training days, 1,800 on 4 rest days. This approach improves workout performance and psychological adherence for many people.