TDEE Macros Cutting Calculator

A moderate deficit of 300-500 calories below TDEE produces 0.6-1.0 lbs of fat loss per week — the sweet spot for preserving muscle mass. Larger deficits (750-1000 calories) accelerate weight loss but increase muscle loss risk, especially for lean individuals below 15% body fat. Research shows that leaner individuals should use smaller deficits: 10-15% below TDEE at 10-15% body fat, 15-20% at 15-20%, and up to 25% above 20% body fat. For a 180-pound male with a TDEE of 2,800 calories, a 20% deficit targets 2,240 calories — enough to lose approximately 1 lb per week. Periodic diet breaks (1-2 weeks at maintenance every 6-8 weeks) help prevent metabolic adaptation where TDEE decreases beyond what weight loss alone would predict.

Protein is the most critical macronutrient during caloric restriction. Multiple studies demonstrate that protein intake of 0.8-1.2g per pound of body weight minimizes muscle loss during a cut, while intake below 0.6g/lb leads to significant lean mass reduction. For a 180-pound individual, this means 144-216g of protein daily (576-864 calories from protein alone). Higher protein intake also increases satiety (keeping you fuller on fewer calories), has the highest thermic effect of food (25-30% of protein calories are burned during digestion versus 5-10% for carbs and 0-3% for fat), and preserves metabolic rate by maintaining muscle mass. Distribute protein across 3-5 meals with at least 25-40g per meal to maximize muscle protein synthesis throughout the day.

After setting protein, remaining calories split between carbs and fats. Minimum fat intake should be 0.3-0.4g per pound of body weight (54-72g for 180 lbs) to support testosterone production, hormone function, and fat-soluble vitamin absorption. Dropping below 40g of fat daily reliably impairs hormonal health. Remaining calories go to carbohydrates, which fuel high-intensity training. For the 180-lb example at 2,240 calories with 180g protein (720 cal) and 65g fat (585 cal): remaining carbs = (2,240 - 720 - 585) / 4 = 234g. On training days, shift more calories toward carbs (reduce fat slightly) to support workout performance. On rest days, slightly higher fat and lower carbs can improve satiety without affecting recovery. Track weekly averages rather than obsessing over daily exact numbers.

This cutting calculator works in four steps: it estimates your resting energy needs, scales them to your daily activity, subtracts a calorie deficit, then acts as a macro calculator to split the result into protein, carbs, and fat.

First it computes your basal metabolic rate (BMR) with the Mifflin-St Jeor equation, which the Academy of Nutrition and Dietetics recognizes as one of the most accurate predictive formulas for healthy adults. BMR is then multiplied by an activity factor to give total daily energy expenditure (TDEE) — the calories you burn in a typical day.

The calculator subtracts your chosen deficit and converts the target calories into grams using fixed energy values:

• Protein — 4 calories per gram
• Carbohydrate — 4 calories per gram
• Fat — 9 calories per gram

These conversion factors are the standard Atwater values published by the USDA. Because BMR formulas are estimates, treat the output as a starting point and adjust based on 2-3 weeks of real weight data.

Enter your stats, pick a phase and a macro preset, then read your target calories and macro grams. The whole process takes under a minute.

Follow these steps:

• Enter gender, age, height, and weight in your preferred units
• Choose an activity level that reflects your weekly training and daily movement, not your best week
• Select the phase — cut, maintain (recomp), or bulk
• Pick aggressiveness — mild, moderate, or aggressive
• Choose a macro preset — standard 40/30/30, high-protein 40/40/20, keto, or custom

Worked example: a 30-year-old male, 80 kg, 180 cm, moderate activity gets a TDEE near 2,765 calories. A moderate cut of −500 sets the target at 2,265 calories per day, and the high-protein preset returns roughly 227 g protein, 227 g carbs, and 50 g fat, for about 1 lb of loss per week.

After two to three weeks, compare your weekly average weight to the predicted rate and adjust calories if you are off target.

The most common cutting mistake is setting the deficit too aggressively, which sacrifices muscle and stalls progress. A slower cut protects lean mass and training quality far better than crash dieting.

Watch for these frequent errors:

• Cutting too hard, too fast — very large deficits accelerate muscle loss, especially once you are already lean
• Underestimating portions — the CDC notes that most people undercount calories, so weigh foods rather than guessing
• Dropping protein — protein is the macro that preserves muscle in a deficit and should stay high
• Slashing fat below the floor — chronically low fat intake can impair hormone production
• Weighing yourself only on good days — water weight masks trends, so track a weekly average instead

Another mistake is treating the calculator output as permanent. As you lose weight, your BMR and TDEE fall, so recalculate every 4-6 kg (about 10 lb).

Because deep or prolonged dieting can affect health, the National Institutes of Health advises consulting a physician or registered dietitian before starting an aggressive cut, particularly if you have a medical condition.

TDEE (total daily energy expenditure) is the total number of calories you burn in a day, while BMR (basal metabolic rate) is only the energy your body uses at complete rest. TDEE is always larger because it adds movement, digestion, and exercise on top of BMR.

TDEE has four components:

• BMR — energy for breathing, circulation, and basic cell function, typically 60-70% of the total
• Thermic effect of food — calories burned digesting meals, roughly 10%
• Exercise activity — deliberate training sessions
• Non-exercise activity (NEAT) — walking, fidgeting, and daily chores, which the National Institutes of Health highlights as a large and variable driver of daily burn

This calculator estimates TDEE by multiplying BMR by an activity factor from about 1.2 (sedentary) to 1.9 (very active). The American College of Sports Medicine cautions that these multipliers are population averages, so your real maintenance may differ by a few hundred calories. Confirm your true maintenance by holding calories steady for two weeks and watching whether weight stays flat.

Cutting macros run below TDEE with protein prioritized to protect muscle, while lean bulk macros run just above TDEE with extra carbs to fuel growth. The macronutrient priorities shift with the calorie total, but protein stays high in both phases.

For a cut:

• Protein — high, commonly 2.2-2.6 g/kg, to preserve lean mass in a deficit
• Fat — kept above roughly 0.5 g/kg to support hormones
• Carbs — fill the remaining calories to power training

For a lean bulk:

• Surplus — a small 200-300 calories above TDEE to gain about 0.25-0.5 lb per week
• Protein — around 1.6-2.0 g/kg is sufficient when calories are ample
• Carbs — increased to drive performance and recovery

The International Society of Sports Nutrition supports higher protein at the upper end of these ranges during energy restriction. The American Heart Association recommends favoring unsaturated fats and fiber-rich carbohydrates in either phase, so the same gram targets can support heart health when food quality is good.

Each macro preset splits your target calories differently: standard 40/30/30 balances all three macros, high-protein 40/40/20 maximizes muscle retention, and keto uses very low carbs with high fat. Choosing a preset changes gram targets but not your total calories or rate of loss.

Here is what each preset emphasizes:

• Standard 40/30/30 — a balanced, sustainable split that suits most people
• High-protein 40/40/20 — extra protein and lower fat, useful on aggressive cuts to maximize satiety and lean-mass protection
• Keto 5/25/70 — very low carbohydrate (often under 50 g/day), high fat, moderate protein

The USDA Dietary Guidelines set broad acceptable ranges for each macronutrient, and all of these presets can fit within a healthy pattern when overall calories and food quality are controlled. Keto is not inherently superior for fat loss; the CDC notes that fat loss ultimately depends on the calorie deficit, not the specific carb-to-fat ratio. Pick the preset you can adhere to consistently, since adherence — not the ratio — drives long-term results.

When weight loss stalls for two or more weeks, make a small adjustment rather than a drastic calorie cut. As you lose weight your BMR and TDEE decline, so the deficit that once worked eventually becomes maintenance.

Try these steps in order before slashing food:

• Recalculate TDEE with your new, lower body weight
• Increase daily steps or NEAT to raise total burn without eating less
• Trim 100-150 calories from your current intake, usually from carbs or fat
• Take a 1-2 week diet break at maintenance to ease metabolic adaptation on long cuts
• Tighten tracking, since portion creep is the most common hidden cause of stalls

The National Institutes of Health has documented that the body adapts to prolonged energy restriction by lowering energy expenditure, which is a normal physiological response rather than a broken metabolism. The American College of Sports Medicine recommends adding activity as a first-line strategy because it preserves food intake and training fuel. Avoid repeatedly gutting calories, which harms adherence, performance, and muscle.

Yes, body recomposition — losing fat while gaining muscle — is possible, and it works best for beginners, people returning after a layoff, and those with higher body fat. Recomp uses calories at or near maintenance rather than a large deficit.

The key drivers of successful recomp are:

• High protein — around 2.2 g/kg or more to support muscle protein synthesis
• Progressive resistance training — the stimulus that partitions calories toward muscle
• Calories near maintenance (TDEE) — a very small deficit or maintenance, not an aggressive cut
• Adequate sleep and recovery — essential for both fat loss and muscle repair

Set the phase to "maintain" in this calculator to generate recomp-style targets. The American College of Sports Medicine confirms that resistance training paired with sufficient protein preserves and builds lean mass across a range of calorie levels. Progress is slower than a dedicated cut or bulk, so judge results with photos, strength numbers, and body measurements rather than scale weight alone, which can stay flat while composition improves.