How is the calorie deficit calculated?

The calculator determines your Total Daily Energy Expenditure (TDEE) based on your age, sex, height, weight, and activity level, then subtracts your desired deficit rate.

Can my calorie deficit be too large?

Yes. Deficits exceeding 1,000 calories per day can trigger muscle loss, metabolic slowing, and nutritional deficiencies.

Calorie Deficit Calculator

Q: What is a good calorie deficit for weight loss?

A safe and sustainable calorie deficit is between 300 to 500 calories per day, resulting in approximately 0.5 to 1 lb (0.25 to 0.5 kg) of fat loss per week.

Gender

Age

Height (cm)

Weight (kg) Check standard ranges using our Ideal Weight Calculator or BMI Calculator.

Activity Level Learn how total energy output is measured via the TDEE Calculator.

Deficit & Weight Loss Goal

How Calorie Deficit Work

To lose weight, your body needs to burn more calories than it consumes. The calculator uses the Revised Harris-Benedict formula to establish baseline maintenance and applies your target rate of loss:

Core Equations:

1. BMR = Mifflin-St Jeor / Harris-Benedict Formula

2. Maintenance (TDEE) = BMR × Activity Multiplier

3. Calorie Target = TDEE - Chosen Daily Deficit

Note: 1 lb of fat is equivalent to roughly 3,500 calories. A 500 kcal daily deficit yields ~1 lb of weight loss per week.

Frequently Asked Questions (FAQ)

1. What is a good calorie deficit for weight loss?

A moderate calorie deficit of 300 to 500 calories per day is generally recommended. It promotes consistent fat loss without causing severe hunger or muscle degradation.

2. How does this link with my daily calorie guide?

If you're unsure about overall nutrition planning, check our comprehensive How Many Calories Should I Eat Guide for deep dietary strategies.

3. How much water should I drink during a deficit?

Water requirements remain high during fat loss to flush metabolic byproducts. Use our Water Intake Calculator to calculate exact fluid requirements.

4. Should I recalculate as I lose weight?

Yes. As your body weight decreases, your baseline BMR drops slightly. Recalculate your deficit every 5 to 10 lbs lost to maintain progress.