What is a safe calorie deficit for weight loss?

A standard, healthy calorie deficit is 500 calories per day below your TDEE, which results in losing approximately 1 pound (0.45 kg) of fat per week without sacrificing lean muscle tissue.

What equation does this calculator use?

This calculator uses the Mifflin-St Jeor equation, universally regarded by dieticians and scientific clinical studies as the most accurate formula for estimating Basal Metabolic Rate (BMR).

TDEE & Calorie Deficit Macro Calculator

Calculate your daily maintenance calories, determine your ideal caloric deficit for fat loss, and view an exact macronutrient split for protein, fats, and carbs.

🧍 Body & Activity Profile

Biological Sex

Age (Years)

Current Weight Pounds (lbs)

lbs

Height Inches (5'10" = 70 in)

Daily Physical Activity

Your Fitness Goal

🎯 Your Daily Calorie Target

Target Daily Calories

2,025 kcal

500 kcal Deficit • Fat Loss Mode

Basal Metabolic Rate (BMR)	1,836 kcal / day
Maintenance Level (TDEE)	2,525 kcal / day
Weekly Estimated Fat Loss	-1.0 lb / week

🥗 Daily Macronutrient Split

PROTEIN (35%)

177g

708 kcal

FATS (25%)

56g

506 kcal

CARBS (40%)

203g

810 kcal

The Science of Caloric Deficits and TDEE

Weight management follows the first law of thermodynamics: energy cannot be created or destroyed, only transformed. To lose body fat, you must create an energy deficit where your body burns more calories than you consume through food.

1. What is BMR vs. TDEE?

BMR (Basal Metabolic Rate): The baseline number of calories your body requires just to stay alive (pumping blood, breathing, cellular repair) while at complete bed rest.
TDEE (Total Daily Energy Expenditure): Your actual daily calorie burn, combining BMR with daily movement, work activity, exercise, and the thermic effect of food (TEF).

Mifflin-St Jeor Equation:
Men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) + 5
Women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) - 161

2. Why a 500 kcal Deficit is the Gold Standard

One pound of human adipose tissue stores approximately 3,500 kilocalories of chemical energy. A deficit of 500 kcal daily results in 500 × 7 days = 3,500 kcal deficit over a week, leading to a steady, sustainable 1.0 lb of fat loss per week without triggering metabolic slowdown or extreme hunger.

Frequently Asked Questions (FAQ)

During a calorie deficit, clinical sports nutrition studies recommend consuming between 0.8 to 1.2 grams of protein per pound of lean body mass (approximately 1.8 to 2.4 g/kg). High protein preserves muscle tissue while burning fat and keeps satiety hormones elevated.

Excessive deficits often cause adaptive thermogenesis (metabolic slowdown), loss of skeletal muscle, fatigue, elevated cortisol, and gallstone risk. A moderate deficit of 20% below TDEE is optimal for long-term consistency.