TDEE = BMR (Mifflin-St Jeor) × activity multiplier (1.2 sedentary to 1.9 extremely active)
BMR of 1,738 kcal at 'moderately active' (×1.55): TDEE ≈ 2,694 kcal/day.
1.2 for sedentary/desk jobs, up to 1.9 for very intense daily training; pick the closest match to your typical week.
TDEE maintains current weight; eat below it for weight loss or above it for weight gain.