How do I lose weight using my TDEE?

To lose weight, eat less than your TDEE. A deficit of 300–500 calories per day leads to steady fat loss of 0.5–1 lb per week. Track your intake for 2–3 weeks and adjust based on results.

Is TDEE the same as BMR?

No. BMR is the number of calories your body burns at complete rest. TDEE includes BMR plus all additional calories burned through daily activity, exercise, and digesting food.

How accurate is a TDEE calculator?

TDEE calculators are estimates based on population averages. Most people find them accurate within 100–200 calories. Use the result as a starting point and adjust based on real-world results over 2–3 weeks.

Why am I not losing weight if I'm eating at a deficit?

The most common reasons are underestimating calorie intake, overestimating activity level, or water retention masking fat loss. Track food accurately for 2 weeks before adjusting your deficit.

How often should I recalculate my TDEE?

Recalculate every 4–6 weeks or whenever your weight changes by more than 5 lbs, your activity level changes significantly, or your results plateau for more than 3 weeks.

How much protein do I need per day?

Most research supports 0.7–1g of protein per pound of bodyweight per day for active individuals. For fat loss, staying toward the higher end helps preserve muscle. For muscle gain, 0.8–1g per pound is ideal.

Does protein timing matter?

Total daily protein intake matters far more than timing. That said, spreading protein across 3–4 meals and consuming 20–40g within a few hours of training can help maximize muscle protein synthesis.

Can I get enough protein without eating meat?

Yes. Plant-based sources like tofu, tempeh, edamame, lentils, chickpeas, and seitan are high in protein. Combining complementary protein sources throughout the day ensures you get all essential amino acids.

Is too much protein bad for you?

For healthy individuals, high protein intakes up to 1.5g per pound of bodyweight are generally safe. The concern about kidney damage from protein applies only to people with pre-existing kidney conditions.

What protein sources are best for muscle gain?

Animal sources like chicken, beef, eggs, fish, and dairy are complete proteins with high bioavailability. Whey protein is particularly effective post-workout. For plant-based options, soy protein and pea protein are the closest equivalents.

Should I change my protein intake when cutting?

Yes — increase it. When in a calorie deficit, higher protein intake (0.8–1.2g per pound) helps preserve lean muscle mass. This is one of the most evidence-backed strategies for improving body composition while losing fat.

What is a macro split?

A macro split is the percentage of your daily calories that come from protein, carbohydrates, and fat. A common split for fat loss is 40% protein, 30% carbs, 30% fat. For muscle gain, a 30% protein, 45% carbs, 25% fat split is often used.

Do I need to track macros to lose weight?

No — total calorie intake drives weight loss, not macro ratios. However, tracking macros gives you more control over body composition, energy levels, and hunger. It is especially useful if you want to lose fat while preserving muscle.

How many carbs should I eat per day?

Carb needs vary based on activity level and goals. After setting protein and fat targets, carbs fill the remaining calories. Active individuals and those focused on muscle gain benefit from higher carb intakes, while lower carb approaches can work for fat loss.

Should I go low fat or low carb for fat loss?

Research shows both approaches produce similar fat loss results when calories and protein are equated. Choose the approach that best fits your food preferences and lifestyle — the one you can sustain is the one that works.

How do I adjust my macros if I hit a plateau?

First verify your tracking accuracy. If intake is accurate, reduce calories by 100–150 per day by lowering carbs or fat slightly. Avoid dropping protein. Alternatively, increase daily activity with walking or NEAT before cutting more calories.

Can I build muscle and lose fat at the same time?

Yes — this is called body recomposition. It works best for beginners, those returning after a break, and people with higher body fat percentages. It requires eating near maintenance calories with high protein and consistent resistance training.

What is a healthy BMI?

A BMI between 18.5 and 24.9 is considered healthy for most adults. However, healthy BMI ranges can vary slightly by age and ethnicity. Asian populations may have health risks at lower BMI thresholds than the standard classification suggests.

Is BMI accurate for muscular people?

No — BMI is not accurate for highly muscular individuals. Since muscle is denser than fat, athletes and bodybuilders often show a high BMI despite having low body fat. In these cases, body fat percentage is a more reliable measure.

Can I have a normal BMI but still have too much body fat?

Yes. This is called normal weight obesity and occurs when someone has a healthy BMI but a high percentage of body fat due to low muscle mass. This is why BMI should always be considered alongside other measures like waist circumference and body composition.

How often should I calculate my BMI?

Once every 4–8 weeks is sufficient for most people. BMI changes slowly and daily fluctuations in water weight can give misleading readings. Track trends over months rather than obsessing over weekly numbers.

Does BMI differ for men and women?

The BMI formula is the same for men and women, but body fat distribution differs between sexes. Women naturally carry more body fat than men at the same BMI. Some health professionals use gender-specific adjustments when interpreting BMI results.

What should I do if my BMI is in the Obese range?

Start with sustainable changes — a modest calorie deficit, daily walking, and resistance training 2–3 times per week. Even a 5–10% reduction in body weight produces significant health benefits. Use a TDEE calculator to find your calorie target and a protein calculator to protect muscle while losing fat.

What is a healthy body fat percentage?

For men, a healthy body fat percentage is generally 14–24%. For women, it is 21–31%. Body fat above 25% for men and 32% for women is associated with increased health risks.

How accurate is the Navy method?

The US Navy method is accurate within 3–4% for most people when measurements are taken correctly. It is more accurate than BMI-based estimates but less precise than DEXA scans.

How often should I measure my body fat?

Every 4–6 weeks is sufficient for most people. Always measure under the same conditions: same time of day, same hydration level, and same method.

Can I lose fat and gain muscle at the same time?

Yes — this is called body recomposition. It is most effective for beginners, people returning after a break, and those with higher body fat percentages. It requires eating near maintenance calories with high protein intake and consistent progressive resistance training.

Why do men and women have different healthy body fat ranges?

Women naturally carry more essential fat than men due to hormonal differences and the physiological demands of reproduction. Women require approximately 10–13% essential fat compared to 3–5% for men.

What is the fastest way to lower body fat percentage?

A combination of a moderate calorie deficit, high protein intake, and resistance training produces the fastest sustainable results. Resistance training preserves muscle — losing muscle raises your body fat percentage even if the scale drops.

There is no universal good BMR — it varies based on your size, age, and gender. A typical BMR for an adult male is 1,600–2,000 kcal/day and for an adult female is 1,300–1,600 kcal/day.

Does muscle mass affect BMR?

Yes — muscle tissue burns approximately 3 times more calories at rest than fat tissue. Building muscle through resistance training raises your metabolic floor, making it easier to maintain a healthy weight over time.

Why does BMR decrease with age?

BMR decreases with age primarily because of sarcopenia — the natural loss of muscle mass that begins around age 30. Regular resistance training significantly slows this decline and can even reverse it.

Can I increase my BMR?

Yes — the most effective way to increase your BMR is to build muscle through resistance training. Other factors include eating adequate protein, getting sufficient sleep, managing stress, and avoiding prolonged very low calorie diets.

Should I eat at my BMR to lose weight?

No — eating exactly at your BMR is too aggressive and risks muscle loss, fatigue, and nutrient deficiencies. Your fat loss calorie target should be below your TDEE but above your BMR.

How does BMR differ from RMR?

BMR requires strict laboratory conditions — complete physical rest, a fasted state, and a thermoneutral environment. RMR is measured under less strict conditions and is typically 10–20% higher than BMR. The practical difference for calorie planning is minimal.

Calorie Deficit Calculator — How Long to Reach Your Goal Weight?

Q: Should I eat back calories burned during exercise?

It depends on how you calculated your TDEE. If you used an activity multiplier that includes your workouts, do not eat them back. If you used a sedentary multiplier and add exercise separately, eating back 50–75% of burned calories is reasonable.

Calorie Deficit Calculator

Find your daily calorie target and how long it will take to reach your goal weight.

Age

Gender

Weight (kg)

Goal Weight (kg)

Height (cm)

Activity Level Weight Loss Pace

Slow
0.25 kg/week

Moderate
0.5 kg/week

Fast
0.75 kg/week

Please fill in all fields with valid values.

Your TDEE

kcal/day

Target Calories

kcal/day

Daily Deficit

kcal/day

Time to Goal

weeks

Your Plan

What this means for your goals

What is a Calorie Deficit?

A calorie deficit occurs when you consume fewer calories than your body burns in a day. Your body responds by tapping into stored fat for energy, which leads to weight loss over time.

Your total daily calorie burn — known as your TDEE (Total Daily Energy Expenditure) — is the baseline. Eat below that number consistently and you will lose weight. The size of your deficit determines how fast you lose it.

The key numbers to understand:

1 kg of fat = approximately 7,700 calories. To lose 1 kg per week you need a deficit of ~1,100 kcal/day — which is aggressive for most people
0.5 kg per week requires a daily deficit of ~550 kcal — the most common recommendation for sustainable fat loss
0.25 kg per week requires a deficit of ~275 kcal/day — ideal for those close to their goal or wanting to minimize muscle loss

How to Use Your Calorie Deficit

Fat Loss

A calorie deficit is the only proven method for losing body fat. The size of your deficit determines your pace — but bigger is not always better. Too large a deficit leads to muscle loss, fatigue, and metabolic adaptation. A moderate deficit of 300–500 kcal/day hits the sweet spot for most people.

Slow cut (275 kcal deficit): Minimal hunger, maximum muscle retention — best for athletes and those close to goal weight
Moderate cut (550 kcal deficit): The most popular approach — steady fat loss with manageable hunger
Aggressive cut (800+ kcal deficit): Faster results but higher risk of muscle loss — only recommended short term with very high protein intake

Maintenance

If your goal is maintenance, your calorie deficit is zero — you eat exactly at your TDEE. Use our TDEE Calculator to find your exact maintenance number, then track your weight weekly to confirm it is holding steady.

Muscle Gain

Building muscle requires a calorie surplus, not a deficit. However, body recomposition — losing fat while gaining muscle simultaneously — is possible when eating near maintenance with high protein and progressive resistance training. This works best for beginners and those returning after a break.

How Long Will It Take to Reach Your Goal Weight?

Fat loss timelines depend on three things: how much you want to lose, your daily deficit, and your consistency. Use the calculator above to get your personalized estimate.

As a general guide:

5 kg to lose: 10–20 weeks depending on pace
10 kg to lose: 20–40 weeks depending on pace
20 kg to lose: 40–80 weeks depending on pace

These are estimates based on a consistent deficit. Real-world results vary due to water retention, hormonal fluctuations, and adherence. Expect your weight to fluctuate by 1–2 kg day to day — track weekly averages, not daily numbers.

Related Calculators

TDEE Calculator — Find your total daily calorie needs
BMR Calculator — Calculate your basal metabolic rate
Protein Calculator — Find your ideal daily protein intake
Macro Calculator — Break your calories into protein, carbs, and fat
BMI Calculator — Calculate your Body Mass Index
Body Fat % Calculator — Estimate your body fat percentage

Calorie Deficit calculator FAQ

How do I calculate my calorie deficit?

Subtract your target daily calories from your TDEE. For example, if your TDEE is 2,500 kcal and you eat 2,000 kcal, your deficit is 500 kcal/day. Over 7 days that is a 3,500 kcal weekly deficit — enough to lose approximately 0.45 kg per week.

Is a 500 calorie deficit safe?

Yes — a 500 kcal/day deficit is widely considered safe and sustainable for most healthy adults. It produces roughly 0.5 kg of fat loss per week without significantly impacting energy levels or muscle mass, especially when paired with adequate protein intake.

What happens if my deficit is too large?

Deficits above 1,000 kcal/day increase the risk of muscle loss, nutrient deficiencies, fatigue, and metabolic adaptation — where your body lowers its calorie burn in response to prolonged restriction. This makes long-term fat loss harder. Staying in a moderate deficit is more effective over time.

Should I eat back calories burned during exercise?

It depends on how your TDEE was calculated. If your activity level already accounts for your workouts, do not eat them back. If you selected a sedentary multiplier and exercise on top of that, eating back 50–75% of burned calories is a reasonable approach to avoid too large a deficit.

Why am I not losing weight in a calorie deficit?

The most common reasons are underestimating calorie intake, overestimating portions, or not accounting for liquid calories and cooking oils. Weigh your food with a kitchen scale for 2 weeks to get an accurate picture. Water retention from high sodium, stress, or new training can also mask fat loss on the scale for 1–2 weeks.

How much protein should I eat in a calorie deficit?

Aim for 1.6–2.2g of protein per kg of bodyweight while cutting. Higher protein intake preserves muscle mass, keeps you fuller for longer, and has a higher thermic effect — meaning your body burns more calories digesting it compared to carbs or fat. Use our Protein Calculator to find your exact target.