TDEE Calculator

What Is a TDEE Calculator?

TDEE — Total Daily Energy Expenditure — is the number of calories your body actually burns in a day, accounting for everything you do: sleeping, working, exercising, walking to the kettle. It's the maintenance number. Eat exactly this amount and your weight stays roughly flat. Eat less and you lose weight; eat more and you gain.

Most people operate on a vague sense of what they eat without any reference point. The result is that diets feel either too restrictive (a deficit that's too large) or mysteriously ineffective (no actual deficit at all). Having a concrete TDEE number fixes both problems. It also explains why cutting calories stopped working: as you lose weight, your TDEE drops, and what was a deficit becomes maintenance.

Enter your age, sex, height, current weight, and activity level. Activity level matters enormously — the difference in TDEE between sedentary and moderately active is typically 400–600 kcal a day, which is more than most people realise. You'll get your TDEE alongside suggested targets for fat loss and muscle gain.

How Do You Use This TDEE Calculator?

Enter your sex, age, weight, and height. Select your activity level — be honest, most people overestimate. Click Calculate to see your TDEE and calorie targets for different goals.

1. Select your sex — biological sex affects BMR due to hormonal and body composition differences.
2. Enter your age in years.
3. Enter your weight in kg (or switch to lbs using the imperial option).
4. Enter your height in cm (or feet and inches).
5. Select your typical activity level — average across a full week.
6. Click Calculate to see your TDEE and calorie targets for different goals.

How Does the TDEE Calculator Formula Work?

The formula used: TDEE = BMR × Activity Multiplier. BMR (Mifflin-St Jeor): Men = 10W + 6.25H - 5A + 5; Women = 10W + 6.25H - 5A - 161

What Are Some Example Calculations?

A 30-year-old man, 80 kg, 175 cm, moderately active: BMR = 1,848 kcal. TDEE = 1,848 × 1.55 = 2,864 kcal/day.

When Should You Use a TDEE Calculator?

When starting a structured diet or fitness plan. Use your TDEE as the anchor: subtract 400–500 kcal for steady fat loss, add 200–300 kcal for lean muscle gain. Track your intake against it for two weeks, then adjust based on actual results — the formula is accurate for most people but individual metabolism varies.

Every 4–6 weeks during an ongoing programme. Body weight changes affect TDEE, so recalculate at your new weight. Ignoring this is the most common reason diets plateau — the deficit that produced results in week 1 has disappeared by week 8 as your body adapts.

What Do These Terms Mean?

What Are the Best Tips to Know?

• Be honest about activity level — overestimating inflates your TDEE and makes calorie targets too high.
• A deficit of 500 kcal/day below TDEE produces approximately 0.5 kg of fat loss per week.
• Recalculate your TDEE every 4–8 weeks as your weight changes.
• TDEE is an estimate — individual metabolic variation means actual needs can differ by 10–15%.
• Protein has a higher thermic effect than carbs or fat — roughly 25–30% of protein calories are used in digestion.

What Mistakes Should You Avoid?

• Selecting a higher activity level than your actual average — this is the most common source of error.
• Not recalculating after weight loss — TDEE decreases as you lose weight.
• Treating TDEE as an exact figure rather than an estimate.
• Underestimating food intake — studies show people typically underreport calories by 20–40%.