How many calories should a woman eat per day?

The average woman needs approximately 1,600-2,400 calories per day depending on age, weight, height, and activity level. A sedentary 30-year-old woman weighing 60 kg needs roughly 1,700 calories for maintenance. For weight loss, subtract 500 calories from your maintenance level. Use our [Calorie Calculator](/tools/calorie-calculator) for an exact figure based on your specific stats.

How many calories should a man eat per day?

The average man needs approximately 2,000-3,000 calories per day. A moderately active 30-year-old man weighing 80 kg typically needs around 2,500 calories for maintenance. Individual needs vary significantly — a 6'2" man who exercises daily might need 3,000+, while a shorter, sedentary man might need only 2,000.

Is 1,200 calories a day enough?

For most adults, 1,200 calories is the absolute minimum recommended for women (1,500 for men) and should only be followed under medical supervision. Eating below these thresholds increases the risk of nutrient deficiencies, muscle loss, metabolic slowdown, and hormonal disruption. A moderate deficit of 500 calories below your TDEE is safer and more sustainable.

How many calories do I need to lose 1 kg per week?

To lose 1 kg (2.2 lb) per week, you need a daily deficit of approximately 1,100 calories. However, most health professionals recommend a maximum deficit of 500-750 calories per day (losing 0.5-0.75 kg per week) to minimise muscle loss and metabolic adaptation. Faster loss is rarely sustainable.

Do I need to count calories to lose weight?

No — calorie counting is one strategy, not the only one. Some people prefer portion control, intuitive eating, or eliminating specific food groups. However, counting calories is the most precise method and removes guesswork. Even counting for just 2-4 weeks can teach you enough about portion sizes to estimate accurately going forward.

What is the thermic effect of food?

The thermic effect of food (TEF) is the energy your body spends digesting nutrients. Protein has the highest TEF (20-35%), meaning your body burns 20-35% of protein calories just processing them. Carbs have a TEF of 5-15%, and fat only 0-5%. This is one reason high-protein diets are effective for weight loss — fewer net calories are absorbed.

Should I eat the same calories every day?

You don't have to. Zigzag calorie cycling — alternating higher and lower calorie days while maintaining the same weekly total — can reduce metabolic adaptation and improve adherence. Schedule higher days on training days or weekends, and lower days on rest days. Our [Calorie Calculator](/tools/calorie-calculator) generates a personalised zigzag schedule.

How often should I recalculate my calories?

Every 4-6 weeks, or whenever your weight changes by more than 2-3 kg. As your weight drops, your BMR and TDEE drop too, which means the deficit that worked initially will eventually become a maintenance intake. Regular recalculation prevents plateaus.

How Many Calories Should I Eat Per Day? Science-Backed Guide (2026)

The question "how many calories should I eat?" is one of the most searched health questions on the internet — and for good reason. Your daily calorie intake determines whether you lose weight, gain weight, or stay the same. Get it wrong and you'll either plateau, lose muscle, or gain fat you didn't want.

This guide breaks down the science behind calorie needs, explains the formulas dietitians actually use, and gives you a practical framework for finding your number — no guesswork required.

Want the quick answer? Use our free Calorie Calculator to get your personalised target in under 60 seconds. It uses the same formulas explained below.

What Are Calories, Really?

A calorie is a unit of energy. Specifically, it's the amount of energy needed to raise the temperature of 1 gram of water by 1°C. When we talk about food calories, we're actually talking about kilocalories (kcal), but the shorthand "calories" has become universal.

Your body needs calories for three things:

Basal Metabolic Rate (BMR) — the energy to keep your organs functioning, blood pumping, and lungs breathing while at complete rest. This accounts for 60-75% of your daily burn.
Thermic Effect of Food (TEF) — the energy spent digesting, absorbing, and processing nutrients. This is roughly 10% of your intake.
Physical Activity — everything from walking to the gym to fidgeting. This is the most variable component, ranging from 15% (sedentary) to 30%+ (very active).

Together, these make up your Total Daily Energy Expenditure (TDEE) — the total calories you burn in a day. Understanding TDEE is the foundation of every calorie goal.

How to Calculate Your Daily Calorie Needs

Step 1: Calculate Your BMR

Your BMR is the baseline. Two formulas are widely used:

Mifflin-St Jeor (recommended)

Men: (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
Women: (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161

This is the formula recommended by the Academy of Nutrition and Dietetics as the most accurate for the general population. It was developed in 1990 and has been validated across multiple studies.

Harris-Benedict (revised 1984)

Men: 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) − (5.677 × age)
Women: 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) − (4.330 × age)

The original Harris-Benedict equation dates back to 1919. The revised version (Roza & Shizgal, 1984) is more accurate but still tends to estimate slightly higher than Mifflin-St Jeor for some populations.

Katch-McArdle (if you know your body fat %)

BMR = 370 + (21.6 × lean body mass in kg)

This formula ignores gender and age, using lean mass instead. It's the most accurate option for athletes, very lean individuals, or anyone who knows their body fat percentage.

Step 2: Multiply by Your Activity Level

BMR tells you what you burn at rest. To get your TDEE, multiply by an activity factor:

Sedentary ×1.2 Desk job, little 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 exercise 6–7 days/week Extra active ×1.9 Intense daily training or physical job

Common mistake: Most people overestimate their activity level. If you work out 3 times a week but sit at a desk the rest of the time, you're probably "lightly active" — not "moderately active." When in doubt, choose one level lower and adjust based on results.

Step 3: Adjust for Your Goal

Your TDEE is your maintenance number — the calories that keep your weight stable.

Weight loss: Subtract 500 calories for ~1 lb (0.5 kg) per week
Mild weight loss: Subtract 250 calories for ~0.5 lb (0.25 kg) per week
Lean bulk: Add 250 calories for slow muscle gain with minimal fat
Aggressive cut: Subtract 750 calories (not recommended without medical supervision)

Try it yourself: Our Calorie Calculator does all three steps automatically and shows you a complete daily plan with macro targets, protein range, and hydration goal.

How Many Calories Per Day: Quick Reference

These are general estimates based on average body sizes. Your actual needs depend on your specific stats — use a calculator for precision.

Woman, 25, 60 kg 1,700 2,050 2,350 Woman, 35, 70 kg 1,750 2,100 2,400 Woman, 45, 65 kg 1,600 1,950 2,250 Man, 25, 75 kg 2,100 2,550 2,900 Man, 35, 85 kg 2,150 2,600 2,950 Man, 45, 80 kg 2,000 2,450 2,800

The Role of Protein in Calorie Goals

Not all calories are equal when it comes to body composition. Protein is uniquely important:

Preserves muscle during a deficit — without enough protein, up to 25% of weight lost can be muscle rather than fat
Has the highest thermic effect — your body burns 20-35% of protein calories just digesting them (compared to 5-15% for carbs and 0-5% for fat)
Increases satiety — protein keeps you fuller for longer, making it easier to stick to a calorie target

Recommended intake: 0.7–1.0g per pound of body weight (1.6–2.2g per kg). For a 170 lb person, that's 119–170g of protein per day.

Use our Protein Intake Calculator for a personalised target, or our Macro Calculator for a complete protein/carbs/fat breakdown.

Zigzag Calorie Cycling: An Advanced Strategy

Instead of eating the exact same calories every day, zigzag cycling alternates between higher-calorie and lower-calorie days. For example, instead of eating 2,000 calories daily (14,000/week), you might eat:

Higher days (3 days): 2,300 calories
Lower days (4 days): 1,775 calories
Weekly total: 14,000 calories (same as eating 2,000 daily)

Why this works:

Higher-calorie days partially restore leptin (the hormone that regulates hunger and metabolism)
You can align higher days with training or social occasions
It prevents the metabolic adaptation that slows weight loss on a constant deficit

Our Calorie Calculator generates a complete 7-day zigzag schedule automatically.

Why Weight Loss Slows Down (And What to Do)

After 8-12 weeks of dieting, weight loss often stalls. This isn't failure — it's your body adapting. Here's what happens:

Your TDEE drops because you weigh less (lighter bodies burn fewer calories)
Metabolic adaptation reduces your BMR by 5-15% beyond what weight change alone explains
NEAT decreases — you unconsciously move less, fidget less, and take fewer steps
Hunger hormones increase — ghrelin (hunger) goes up, leptin (satiety) goes down

What to do:

Recalculate every 4-6 weeks with your current weight
Track daily steps and keep them above 8,000-10,000 to maintain NEAT
Take a diet break (1-2 weeks at maintenance) every 8-12 weeks
Prioritise sleep — poor sleep increases hunger hormones and reduces willpower

10 Common Calorie Counting Mistakes

Choosing too large a deficit — extreme cuts (1,000+ cal below TDEE) cause muscle loss, metabolic slowdown, and binge cycles
Ignoring liquid calories — a daily latte (190 cal), juice (112 cal), and glass of wine (125 cal) = 427 hidden calories
Eyeballing portion sizes — most people underestimate by 30-50%. Weigh food for the first 2 weeks to calibrate your eye
Not counting cooking oils — one tablespoon of olive oil adds 119 calories. A "light drizzle" can easily be 3 tablespoons (357 cal)
Overestimating exercise burn — fitness trackers overestimate by 30-90%. Don't eat back exercise calories
Skipping protein — insufficient protein during a deficit means losing muscle, which lowers your metabolism further
Weekend "breaks" — two days of unrestricted eating can wipe out a 5-day deficit. A single restaurant meal can exceed 2,000 calories
Not adjusting for weight change — the deficit that worked at 200 lb doesn't work at 180 lb
Relying on "net carbs" labels — sugar alcohols and fibre still have caloric impact for some individuals
Quitting after plateaus — weight fluctuates 2-4 lb daily from water. Look at weekly averages, not daily numbers

The Hidden Calories That Derail Most Diets

These everyday items are where most people unknowingly overshoot:

Olive oil 1 tbsp (119 cal) 3 tbsp pour 357 cal Peanut butter 2 tbsp (190 cal) 3+ tbsp spread 285+ cal Granola ½ cup (260 cal) 1.5 cups poured 780 cal Ranch dressing 2 tbsp (129 cal) 4+ tbsp on salad 258+ cal Grated cheese 30g (120 cal) 70g handful 280 cal

See the full list: Our Calorie Calculator includes a complete hidden calories reference with 15 sneaky items and exactly why they catch people out.

When to See a Professional

A calorie calculator is a starting point — not a diagnosis. See a registered dietitian or your GP if:

You want to eat below 1,200 cal/day (women) or 1,500 cal/day (men)
You have a medical condition that affects metabolism (thyroid, PCOS, diabetes)
You're pregnant, breastfeeding, or recovering from surgery
You have a history of disordered eating
You're under 18

Tools to Help You Hit Your Target

Calorie Calculator — find your exact daily target with 3 formula options and zigzag cycling
Macro Calculator — get personalised protein, carbs, and fat targets
BMR Calculator — understand your resting metabolic rate
TDEE Calculator — see your full daily energy breakdown
Protein Intake Calculator — optimise protein for your goal
Body Fat Calculator — estimate body fat for more accurate BMR
Weight Loss Calculator — project how long it will take to reach your goal

How Many Calories Should I Eat Per Day? The Complete Science-Backed Guide