TDEE Calculator Free Online — Calories, BMR & Macros Explained

What TDEE Means and Why It Is the Most Important Number for Body Composition

TDEE stands for Total Daily Energy Expenditure — the total number of calories your body burns every day across all activity. It is the number that determines whether you gain, lose, or maintain weight. Eat below your TDEE and you lose fat; eat above it and you gain mass; eat at it and you maintain.

Most people trying to change their body composition fail not because of poor willpower but because they are guessing their intake against an unknown target. Knowing your TDEE removes the guesswork.

BMR vs TDEE: The Difference

BMR (Basal Metabolic Rate) is the calories your body burns at complete rest — the energy required for breathing, circulation, organ function, and cellular repair. For most adults, BMR is 60–75% of total daily calorie burn.

TDEE = BMR × Activity Multiplier. The multiplier accounts for exercise, daily movement, the thermic effect of food, and non-exercise activity thermogenesis (NEAT). For sedentary individuals the multiplier is 1.2; for those doing hard daily training it can reach 1.9.

The Four BMR Formulas the Calculator Uses

The calculator automatically uses Katch-McArdle as the primary formula when you provide body fat percentage, because it models lean mass directly and is more accurate for anyone whose body composition differs from the population average that Mifflin-St Jeor was derived from.

Activity Multipliers Explained

These multipliers are population averages. Individual NEAT (non-exercise activity thermogenesis — fidgeting, incidental walking, standing) can vary by 300–500 kcal/day between people with the same stated activity level. Always treat your initial TDEE estimate as a hypothesis and adjust by ±100–150 kcal every two weeks based on actual weight change.

How to Use the Calculator Step by Step

1. Select metric or imperial units at the top of the TDEE Calculator.
2. Enter age, gender, weight, and height. If you know your body fat percentage, enter it — this unlocks the Katch-McArdle formula and improves accuracy.
3. Select your activity level. When in doubt, choose the level below what you think — most people overestimate activity.
4. Choose your goal: aggressive cut, cut, mild cut, maintain, mild bulk, bulk, or aggressive bulk.
5. Click Calculate My TDEE to see BMR, TDEE, and your goal-specific calorie target.
6. Review the formula comparison table to see how all four formulas compare for your inputs.
7. Select a macro preset and adjust the number of meals to get per-meal targets.

Setting Calorie Goals

Macro Presets and When to Use Each

Balanced (30% protein / 40% carbs / 30% fat)

A practical default for most people. Hits adequate protein without being extreme, provides enough carbohydrates for energy, and keeps fat at a reasonable level. Works for general fitness, weight maintenance, and moderate cuts.

High Protein (40% protein / 35% carbs / 25% fat)

The best option for body recomposition — building muscle while in a deficit. High protein intake (typically 1.6–2.2 g/kg) is the single strongest dietary lever for preserving lean mass during a cut and maximising muscle protein synthesis during a bulk.

Low Carb (35% protein / 20% carbs / 45% fat)

Useful for individuals who manage blood sugar better with reduced carbohydrate intake, or who prefer fat as a primary fuel source. Not inherently superior for fat loss when protein and calories are controlled, but can reduce appetite for some people.

Keto (25% protein / 5% carbs / 70% fat)

A very low carbohydrate approach that induces nutritional ketosis. The 5% carb allocation at typical calorie targets means fewer than 30–40 g of carbs daily. Requires careful electrolyte management and is difficult to sustain for many people, but can be effective for those with specific metabolic goals.

High Carb (20% protein / 60% carbs / 20% fat)

Appropriate for endurance athletes — runners, cyclists, triathletes — whose performance depends on glycogen availability. Also used during deliberate muscle-building phases where high carbohydrate intake supports training volume and recovery.

Protein Targets by Goal

The calculator shows protein needs per kg of bodyweight across four levels. The key insight from the research: protein requirements increase during a calorie deficit. The body under energy restriction is more likely to break down muscle for fuel, so higher protein intake (2.2–2.6 g/kg) during a cut is needed to preserve the lean mass you are trying to keep.

Common Questions

My TDEE seems too high / low. What should I do?

TDEE formulas are population averages with real individual variation. The correct approach is to eat at your calculated TDEE for 2 full weeks while tracking weight daily. Calculate the weekly average weight change. If you are gaining weight at maintenance, reduce by 150 kcal. If losing, increase by 150 kcal. Repeat until weekly weight is stable.

Should I eat back exercise calories?

If you selected an activity level that already includes your exercise, no — eating back calories would create a double-count. The TDEE multiplier already accounts for your training. Only eat back exercise calories if you logged your activity as Sedentary and are tracking workouts separately.

Why is there a 1000 kcal minimum?

Below approximately 1000–1200 kcal it becomes very difficult to meet minimum protein and micronutrient needs. Severe restriction also drives significant metabolic adaptation — the body reduces TDEE in response — making the deficit less effective than the numbers suggest. Very low calorie diets should only be undertaken with medical supervision.

How often should I recalculate?

Recalculate every 4–5 kg of weight change, or whenever progress stalls for two consecutive weeks. TDEE decreases as body weight decreases, so the calorie target that produced results at the start of a cut will eventually stop working.