Tou Calo

Written by Tou Calo Nutrition Team · Vulcan Labs · Updated June 2026

How many calories should I eat to lose weight? The answer is different for every person — and guessing it is the #1 reason most diets fail. Before counting a single calorie, you need one number: your Total Daily Energy Expenditure (TDEE). That is the exact number of calories your body burns each day. Eat below it, and you lose weight. Eat above it, and you gain. Everything else is noise.

Free tool: Calculate your personal calorie target in 30 seconds →

1. What is TDEE — and why does it determine how many calories you should eat to lose weight?

Your TDEE is the total calories your body burns in a 24-hour period — not just at rest, but including every step you take, every workout you do, and even the energy used to digest food. It is calculated from your Basal Metabolic Rate (BMR) — the calories your body needs at complete rest — multiplied by your activity level.

Most people try to answer “how many calories should I eat to lose weight” by cutting food randomly — removing carbs, skipping meals, eating “clean” — without ever knowing their actual burn rate. Without your TDEE, you are guessing. And guessing is why most diets stall within 3 weeks.

Example: Two people who both weigh 70 kg can have TDEEs of 1,800 and 2,400 calories — a 600 calorie difference — depending on age, height, gender and activity level. The same diet would produce completely different results for each of them. This is why generic answers to “how many calories should I eat to lose weight” are not just unhelpful — they can be actively harmful.

Use our free BMR calculator to find your resting baseline first, then use our TDEE calculator to get your full daily burn, including activity.

2. How many calories should I eat to lose weight?

To lose weight, you need to eat fewer calories than your TDEE. The difference between what you burn and what you eat is your calorie deficit. Your body makes up that energy gap by burning stored fat.

For most adults asking how many calories they should eat to lose weight, the answer is a deficit of 400–500 calories per day below their TDEE, producing approximately 0.5 kg of fat loss per week at a rate that is safe, sustainable, and preserves muscle mass.

Goal	Daily intake	Weekly loss	Recommended for
Slow and steady	TDEE − 250 kcal	~0.25 kg/week	Close to goal weight, elderly adults
Recommended ✅	TDEE − 500 kcal	~0.5 kg/week	Most adults — best balance of speed and sustainability
Aggressive	TDEE − 750 kcal	~0.75 kg/week	Higher starting weight, short-term only

Calculate your personal number: Use our TDEE calculator to find exactly how many calories you burn per day, then subtract 500 to get your daily weight loss target.

3. How many calories should I eat to lose weight safely? The 400–500 rule explained

The most common mistake when figuring out how many calories to eat to lose weight is making the deficit too large too fast. A deficit of 1,000+ calories per day might seem like it would double your results — but it consistently leads to muscle loss, extreme hunger, metabolic adaptation, and eventual rebound weight gain.

The sweet spot for most people asking how many calories they should eat to lose weight safely is a deficit of 400–500 kcal per day. Here is why this works better than extremes:

• Preserves muscle: A moderate deficit with high protein keeps muscle while burning fat. Very low-calorie diets burn muscle and fat equally, so you lose weight but end up with worse body composition.
• Sustainable hunger levels: You are not constantly starving, so you can actually maintain the deficit over weeks and months. Compliance is the biggest variable in weight loss.
• Protects metabolism: Very low-calorie diets slow your metabolism as your body adapts to conserve energy. A 500-calorie deficit avoids this metabolic slowdown.
• Muscle protein synthesis: Eating enough supports muscle repair from exercise, which increases your resting metabolic rate over time — making future weight loss easier.

Important: Never eat below your BMR — the minimum calories your body needs at complete rest. This is your absolute floor when deciding how many calories you should eat to lose weight. Use our free BMR calculator to find your personal floor before setting any calorie target.

How to calculate exactly how many calories you should eat to lose weight

1. Step 1 — Find your BMR: Use our BMR calculator to find how many calories your body burns at complete rest.
2. Step 2 — Calculate your TDEE: Use our TDEE calculator — enter your activity level to find your true daily calorie burn.
3. Step 3 — Set your deficit: Use our calorie deficit calculator to subtract 500 calories and get your exact daily eating target.
4. Step 4 — Track every meal accurately: Knowing how many calories you should eat to lose weight only works if your tracking is accurate. See Section 4 below.

4. Why am I not losing weight even though I know how many calories I should eat?

This is the most common frustration in weight loss — and the answer is almost always the same. Studies consistently show that people underestimate their calorie intake by 20–40% when tracking manually or estimating portion sizes. So even when people think they know how many calories they should eat to lose weight and believe they are hitting that target, their actual intake is much higher.

• A handful of almonds logged as “small” is likely 200 calories, not 100.
• A restaurant portion of rice or pasta is typically 1.5–2× what people estimate.
• Cooking oil you forgot to log adds 100–120 calories per tablespoon.
• Sauces, dressings, and drinks add 200–400 invisible calories per day.

These gaps add up to hundreds of calories per day — completely erasing the deficit you worked out from our calorie deficit calculator, without you realising it.

The solution is accurate tracking. Tou Calo’s AI identifies food from a photo and logs exact calories in 3 seconds — removing the estimation errors that cause most calorie deficits to fail in practice.

5. How many calories should I eat to lose weight while keeping muscle?

Knowing how many calories you should eat to lose weight is only half the answer. The macro split — especially protein — determines whether you lose fat only, or fat and muscle together. Getting this right is what separates people who look lean after losing weight from those who just look smaller.

To preserve muscle while in a calorie deficit:

• Protein target: 1.6–2.2g per kg of bodyweight per day. For an 80 kg person, that is 128–176g of protein daily.
• Carbs and fat: Fill the remaining calories with a balance that suits your preference — there is no single correct split.
• Meal timing: Spread protein across 4–5 meals of 30–40g each for maximum muscle protein synthesis.

Use our BMR calculator to confirm your calorie floor, then prioritise hitting your protein target within your daily calorie budget.

FAQ — How many calories should I eat to lose weight?

How many calories should I eat to lose weight per day?

First calculate your TDEE — the calories your body burns each day. Then subtract 400–500 calories from that number. The result is your daily calorie target for weight loss. Use our free TDEE calculator to get your personal number in 30 seconds. The answer to how many calories you should eat to lose weight is always based on your individual TDEE, not a generic number.

Is 1,200 calories a day enough to lose weight?

1,200 calories is not a universal answer to how many calories you should eat to lose weight — it may be appropriate for some people, but dangerously low for others. Whether 1,200 creates a healthy deficit depends entirely on your personal TDEE. Someone with a TDEE of 1,600 kcal would have a reasonable 400 kcal deficit. Someone with a TDEE of 2,400 kcal would be creating a dangerous 1,200 kcal deficit. Always base your intake on your individual TDEE, found using our TDEE calculator.

How long will it take to lose 5 kg eating in a calorie deficit?

At a moderate deficit of 500 kcal per day, you will lose approximately 0.5 kg per week. At that rate, losing 5 kg takes about 10 weeks. A larger deficit of 750 kcal per day would achieve it in roughly 7 weeks, but comes with more hunger and slightly higher risk of muscle loss. Use our calorie deficit calculator to see your personalised timeline.

Should I eat back the calories I burn during exercise?

It depends on how you calculated your TDEE. If you used a moderate or active activity multiplier in our TDEE calculator, your exercise calories are already included — eating them back would cancel your deficit. If you used “sedentary” and exercise regularly, eating back around 50% of burned calories is reasonable to prevent excessive hunger and muscle loss.

What is the minimum calories I should eat per day to lose weight safely?

You should never eat below your BMR — the calories your body needs at complete rest. Eating below your BMR forces your body to break down muscle for energy and slows your metabolism significantly. Use our BMR calculator to find your personal floor. Most adults have a BMR between 1,300–1,900 kcal — this is the absolute minimum, not a target for weight loss.

Disclaimer: This guide provides general nutritional information on how many calories you should eat to lose weight. Individual calorie needs vary based on medical history, age, and health status. Consult a registered dietitian or physician before making significant changes to your diet.

Written by Tou Calo Nutrition Team — Vulcan Labs
The team behind Tou Calo AI Calorie Counter. We build tools that make understanding your personal calorie needs effortless.

Related tools and guides:
🔬 BMR Calculator — your resting calorie floor
⚡ TDEE Calculator — your total daily calorie burn
🔥 Calorie Deficit Calculator — your exact weight loss target