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.

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.

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.

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. 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.

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. 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.

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.

BMI Calculator — What Does Your BMI Mean?

BMI Calculator

Calculate your Body Mass Index and find out what it means for your goals.

Weight (kg) Height (cm)

Age Gender

Please fill in all fields with valid values.

Underweight
<18.5 Normal
18.5–24.9 Overweight
25–29.9 Obese
30+

What is BMI?

Your Body Mass Index (BMI) is a simple calculation that divides your weight by the square of your height. The result places you into one of four categories: Underweight, Normal Weight, Overweight, or Obese.

BMI was developed as a population-level screening tool and is used by doctors, nutritionists, and fitness professionals worldwide as a quick reference point. While it is not a perfect measure of health or body composition, it gives you a useful starting point to set realistic goals.

The four BMI categories are:

Underweight: BMI below 18.5 — may indicate insufficient muscle or fat mass
Normal Weight: BMI 18.5–24.9 — associated with the lowest health risks for most adults
Overweight: BMI 25–29.9 — increased risk of metabolic and cardiovascular conditions
Obese: BMI 30 and above — significantly elevated health risks, fat loss is the top priority

BMI by Goal

Fat Loss

If your BMI is in the Overweight or Obese range, losing body fat is the most impactful thing you can do for your long-term health. A sustainable calorie deficit of 300–500 kcal per day combined with resistance training will help you lose fat while preserving muscle mass. Aim for 0.5–1% of body weight lost per week for best results.

Aggressive cut (500+ kcal deficit): Faster results but higher risk of muscle loss — not recommended without high protein intake
Moderate cut (300–500 kcal deficit): The sweet spot for most people — steady fat loss with minimal muscle loss
Slow cut (200–300 kcal deficit): Best for those close to their goal weight or highly active individuals

Maintenance

If your BMI falls in the Normal Weight range, your focus should be on maintaining your current weight while improving body composition over time. This means eating at roughly your TDEE, training consistently, and monitoring your weight monthly rather than daily. Use our TDEE Calculator to find your maintenance calories.

Muscle Gain

If your BMI is in the Normal or Underweight range and your goal is to build muscle, a slight calorie surplus of 200–300 kcal above your TDEE is ideal. Prioritize progressive resistance training and hit your daily protein target.

Lean bulk (200–300 kcal surplus): Slow but clean muscle gain with minimal fat gain
Standard bulk (300–400 kcal surplus): Slightly faster results, small amount of fat gain expected
Dirty bulk (500+ kcal surplus): Not recommended — excessive fat gain with no additional muscle benefit

BMI Limitations

BMI is a useful screening tool but has real limitations you should be aware of:

Does not distinguish muscle from fat: A muscular athlete can have a high BMI without carrying excess body fat
Does not account for fat distribution: Where you carry fat matters — abdominal fat carries more health risk than fat stored elsewhere
Varies by age and ethnicity: Asian populations may face health risks at lower BMI thresholds than standard classifications suggest
Not reliable for the elderly: Older adults often lose muscle mass, which can result in a normal BMI despite unhealthy body composition

Use BMI as a starting point, not a definitive measure of your health. For a fuller picture, consider tracking body fat percentage and waist circumference alongside your BMI.

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
Calorie Deficit Calculator — Set your fat loss calorie target
Body Fat % Calculator — Estimate your body fat percentage

BMI Calculator FAQ

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, for example, 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 our TDEE Calculator to find your calorie target and our Protein Calculator to protect muscle while losing fat.