As Calorie or C this measure is taken as 1000 calorie or 1000 c.
For men: BMR = (13.75 WT(kg) + 5.003 HT(cm))(-6.775 age + 66.5). For women: BMR = (9.563 WT(kg) + 1.850 HT(cm)(-4.676 age + 65.5).
BMR is your energy expenditure without any contribution from exercise or digestion. Another term used is the resting energy expenditure (REE), which may also include energy used in digesting food.
Men can use perhaps 2800 and women 2100 kcal/day. TDEE, the maintenance lever, is the total daily energy expenditure or total number of kcal/day.