How Many Calories Should I Eat to Lose Weight?

"How many calories should I eat to lose weight?" is the single most common nutrition question on the internet. And the frustrating truth is that no single number works for everyone.

General ranges suggest women typically need 1,400 to 1,800 calories per day and men need 1,800 to 2,200 calories per day for moderate, sustainable weight loss. But these ranges span 400 calories, and the wrong number for YOUR body could mean the difference between steady progress and a miserable plateau.

This guide gives you the data, the science, and the tables to narrow down your personal range. Then we will explain why tracking your actual intake with a tool like Nutrola is the only way to find your exact number.

How Weight Loss Calories Are Calculated

Weight loss requires a calorie deficit: you must consume fewer calories than your body burns. Your body's total daily energy burn is called your Total Daily Energy Expenditure (TDEE), and it is composed of three main components.

Basal Metabolic Rate (BMR) accounts for 60-70% of your daily burn. This is what your body needs just to keep your organs running, your blood circulating, and your cells functioning while you lie completely still.

Thermic Effect of Food (TEF) accounts for roughly 10% of your daily burn. Digesting, absorbing, and processing food itself costs energy.

Physical Activity accounts for the remaining 20-30%. This includes both structured exercise and Non-Exercise Activity Thermogenesis (NEAT), which covers everything from fidgeting to walking to your car.

The most validated formula for estimating BMR is the Mifflin-St Jeor equation, published in 1990 and consistently shown to be the most accurate predictive equation for healthy adults (Mifflin et al., 1990, American Journal of Clinical Nutrition).

Mifflin-St Jeor Equation:

• Men: BMR = (10 x weight in kg) + (6.25 x height in cm) - (5 x age) + 5
• Women: BMR = (10 x weight in kg) + (6.25 x height in cm) - (5 x age) - 161

Once you have your BMR, multiply it by an activity factor to get your TDEE.

TDEE Estimates by Age, Gender, and Activity Level

The following tables show estimated TDEE values based on the Mifflin-St Jeor equation with standard activity multipliers. These assume average heights (170 cm for men, 163 cm for women).

Women: Estimated Daily TDEE (Calories)

Age	Weight (kg)	Sedentary (x1.2)	Lightly Active (x1.375)	Moderately Active (x1.55)	Very Active (x1.725)
25	60	1,632	1,870	2,108	2,346
25	70	1,776	2,035	2,294	2,554
25	80	1,920	2,200	2,480	2,760
35	60	1,572	1,801	2,031	2,260
35	70	1,716	1,966	2,217	2,467
35	80	1,860	2,131	2,402	2,673
45	60	1,512	1,733	1,953	2,174
45	70	1,656	1,897	2,139	2,380
45	80	1,800	2,063	2,325	2,588

Men: Estimated Daily TDEE (Calories)

Age	Weight (kg)	Sedentary (x1.2)	Lightly Active (x1.375)	Moderately Active (x1.55)	Very Active (x1.725)
25	70	1,944	2,228	2,511	2,795
25	80	2,088	2,393	2,697	3,002
25	90	2,232	2,557	2,883	3,208
35	70	1,884	2,159	2,434	2,708
35	80	2,028	2,323	2,619	2,914
35	90	2,172	2,488	2,804	3,121
45	70	1,824	2,090	2,356	2,622
45	80	1,968	2,255	2,542	2,828
45	90	2,112	2,419	2,727	3,036

How Many Calories for a 150 lb Woman to Lose Weight?

This is one of the most commonly asked specific questions, so let us break it down.

A 150 lb (68 kg) woman who is 5'5" (165 cm) and 30 years old has an estimated BMR of approximately 1,387 calories using the Mifflin-St Jeor equation.

Activity Level	TDEE	Moderate Deficit (-500)	Target Calories
Sedentary	1,664	1,164	1,400*
Lightly Active	1,907	1,407	1,407
Moderately Active	2,150	1,650	1,650
Very Active	2,392	1,892	1,892

*Note: We rounded up to 1,400 because going below 1,200 is not recommended for women without medical supervision.

This is exactly why generic advice like "eat 1,500 calories" can be wildly wrong. A sedentary 150 lb woman and a very active 150 lb woman have completely different targets.

Choosing Your Deficit Size: 250 vs 500 vs 750+ Calories

Not all deficits are created equal. The size of your daily calorie deficit determines both how fast you lose weight and how sustainable the process will be.

Small Deficit: 250 Calories Per Day

• Expected loss: ~0.25 kg (0.5 lb) per week
• Best for: People close to goal weight, athletes, those who want minimal muscle loss
• Sustainability: High. Most people barely notice this reduction
• Risk of muscle loss: Low

Moderate Deficit: 500 Calories Per Day

• Expected loss: ~0.5 kg (1 lb) per week
• Best for: Most people with 5-20 kg to lose
• Sustainability: Moderate. Requires some conscious food choices
• Risk of muscle loss: Low to moderate with adequate protein

Aggressive Deficit: 750+ Calories Per Day

• Expected loss: 0.75+ kg (1.5+ lb) per week
• Best for: Those with significant weight to lose (30+ kg), under medical supervision
• Sustainability: Low. Hunger, fatigue, and metabolic adaptation become real risks
• Risk of muscle loss: Moderate to high

Research published in the International Journal of Obesity (Ashtary-Larky et al., 2020) consistently shows that slow, moderate deficits preserve more lean mass than rapid, aggressive ones.

Should I Eat 1200 Calories to Lose Weight?

Almost certainly not.

The 1,200-calorie recommendation has persisted for decades, but it originated as the minimum threshold for clinical very-low-calorie diets under medical supervision. For most adults, 1,200 calories is insufficient to meet basic micronutrient needs.

Why 1,200 calories is problematic:

• It is below the BMR of most adult women, meaning your body cannot fuel basic organ function
• Studies show metabolic adaptation increases significantly below BMR (Muller et al., 2015, Obesity Reviews)
• Adherence rates plummet. A 2019 review in Nutrients found that very-low-calorie diets had dropout rates exceeding 40%
• Muscle loss accelerates, which further lowers your metabolism
• Micronutrient deficiencies become almost inevitable without supplementation

Minimum recommended intakes:

• Women: 1,200 calories (absolute floor, with medical supervision)
• Men: 1,500 calories (absolute floor, with medical supervision)
• General recommendation: Never go below your BMR

How Many Calories Should a Man Eat to Lose Weight?

Men generally have higher calorie needs than women due to greater muscle mass and larger body size. Here are practical ranges based on common male body types.

Body Type	Weight Range	Sedentary Target	Active Target
Smaller frame	65-75 kg	1,600-1,800	2,000-2,200
Average frame	75-85 kg	1,800-2,000	2,200-2,500
Larger frame	85-100 kg	2,000-2,200	2,400-2,800

These targets assume a moderate 500-calorie deficit. Men should generally not drop below 1,500 calories per day without medical guidance.

Why Calorie Calculators Give You the Wrong Number

Every online calorie calculator, including the tables above, has one fundamental problem: they are based on population averages.

Individual variation is enormous. Research by Pontzer et al. (2021) published in Science analyzed over 6,400 people and found that individuals of the same age, sex, and body size could have metabolic rates that differ by up to 20%.

This means two 35-year-old women who weigh 70 kg could have TDEEs that differ by 300-400 calories per day. One could lose weight steadily at 1,800 calories while the other gains weight at the same intake.

Other factors calculators cannot account for:

• Genetics and metabolic efficiency
• Gut microbiome composition
• Sleep quality and stress levels
• Hormonal status (thyroid, cortisol, sex hormones)
• Medication effects
• Previous dieting history (metabolic adaptation)

The Only Way to Find YOUR Exact Number

Calculators give you a starting point. Tracking gives you the answer.

Here is the evidence-based approach that actually works:

1. Calculate your estimated TDEE using the tables above
2. Subtract 500 calories for a moderate deficit
3. Track your actual intake precisely for 2-3 weeks
4. Weigh yourself daily and calculate weekly averages
5. Adjust based on real results, not predictions

If you are losing 0.5-1% of body weight per week, your calories are right. If not, adjust by 100-200 calories and track again.

This process requires accurate food tracking, and this is where most people fail. Estimating portions by eye leads to errors of 30-50% according to research published in the British Medical Journal (Lichtman et al., 1992).

What 1,600 Calories Actually Looks Like

To make these numbers practical, here is a sample day at 1,600 calories with balanced macros.

Meal	Food	Calories	Protein
Breakfast	2 eggs, 1 slice whole grain toast, 1/2 avocado	380	18g
Lunch	Grilled chicken salad with olive oil dressing, mixed vegetables	450	35g
Snack	Greek yogurt (150g) with berries	170	15g
Dinner	Salmon fillet (150g), sweet potato, steamed broccoli	520	38g
Snack	20 almonds	140	5g
Total		1,660	111g

Logging a day like this in Nutrola takes under two minutes with AI photo recognition. Snap a photo of each meal, confirm the portions, and your full macro and micronutrient breakdown is done.

How to Track Your Calories Accurately

Precision matters. A 100-calorie daily tracking error adds up to over 3 kg of unexpected weight change per year.

Tips for accurate tracking:

• Log everything. Cooking oils, sauces, and beverages account for 200-400 hidden calories in most people's diets
• Use a food scale when starting out. After a few weeks, your portion estimation will improve dramatically
• Track before you eat, not after. Memory-based logging underestimates intake by an average of 30%
• Use verified nutrition data. Many calorie tracking apps contain user-submitted entries with errors. Nutrola's database of 1.8M+ verified foods eliminates this problem
• Track consistently, not perfectly. Research shows that people who track at least 5 days per week lose significantly more weight than those who track sporadically

Find Your Exact Number with Nutrola

The tables and ranges in this guide give you a solid starting point. But the best answer to "how many calories should I eat to lose weight?" comes from tracking YOUR actual intake and adjusting based on YOUR real results.

Nutrola makes this process effortless. AI-powered photo recognition, voice logging, and barcode scanning let you log meals in seconds. The verified database of 1.8M+ foods tracks over 100 nutrients, not just calories, so you know your deficit is not creating nutritional gaps.

Available on iOS, Android, Apple Watch, and Wear OS in 9 languages, Nutrola costs just EUR 2.50 per month with zero ads. Import your favorite recipes, track your progress, and find the calorie target that actually works for your body.

Because the right number of calories is not the one a calculator gives you. It is the one that produces results when you actually track it.