TDEE for a 30-Year-Old Man (180 cm, 80 kg)

What this TDEE result means

For a 30-year-old man at 180 cm, 80 kg, 18% body fat, and moderate activity, the estimated TDEE is 2,770 kcal/day. That is the approximate calorie intake expected to maintain weight. This result uses body composition as well as scale weight, which makes it different from examples calculated with Mifflin–St Jeor.

Why body fat changes the formula

With 18% body fat entered, the calculator estimates 65.6 kg of lean mass and uses Katch–McArdle. The compact calculation is BMR: 370 + 21.6 × (80 × 0.82) = 1,787; TDEE: 1,787 × 1.55 = 2,770 kcal/day. This can be helpful when body-fat data is reasonably accurate, but the output is only as reliable as that measurement.

Smart scales, calipers, and scans can produce different percentages. Repeating the same method under similar conditions is usually more useful than switching methods to find a preferred result. The formula comparison explains when Katch–McArdle may add value.

Activity can outweigh formula precision

Moderate activity raises this estimate from 2,457 kcal/day at light activity to 2,770. Very active would raise it again to 3,083 kcal/day. That 626-calorie span is larger than many small formula differences, so an accurate body-fat input cannot compensate for an activity level that does not match the person’s actual week.

Reading BMI alongside body composition

The calculated BMI is 24.7, near the upper boundary of the general normal range. Here, the entered 18% body fat provides context that BMI cannot: two people with the same height and weight can carry different amounts of lean mass. Waist changes, gym performance, and consistently measured body composition are therefore more informative than trying to move BMI down automatically.

The ideal-weight range of roughly 72.6–78.8 kg is based on height and sex only. It does not use the 18% body-fat entry, so it should remain background information rather than a required destination.

Matching calories to the goal

Maintenance is 2,770 calories. The mild cut is 2,270 kcal/day, while the lean-bulk option is 3,020 kcal/day. A cut may suit a fat-loss phase; a small surplus may support muscle gain. Neither card can predict the exact rate because training, water shifts, tracking accuracy, and metabolic adaptation affect the scale.

Calibrate the macro plan

At maintenance, moderate-carb provides about 208 g protein, 108 g fat, and 243 g carbohydrate. The other splits change the balance without changing total calories.

Use 2,770 as a testable baseline for two to three consistent weeks. Compare average weight, waist, recovery, and training performance, then adjust modestly if the pattern does not match the goal. This is an educational estimate and does not replace individualized health or sports-nutrition advice.