Free tool
Calorie deficit calculator
The daily calories to reach a target rate of loss, held above a safe floor.
— calories a day
Fill in the fields to see your result.
- Maintenance (TDEE)
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- Resting burn (BMR)
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- Actual deficit
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- Protein
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- Carbohydrate
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- Fat
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An estimate. Rapid loss costs muscle as well as fat, which is why the result will not drop below 1,500 calories for men or 1,200 for women.
FAQ
Common questions
What is a calorie deficit?
A calorie deficit occurs when you consume fewer calories than your body burns in a day. Your body requires energy to sustain vital functions like breathing, digestion, and circulation — known as your Basal Metabolic Rate (BMR). When your total calorie intake falls below your Total Daily Energy Expenditure (TDEE), your body taps into stored energy reserves (primarily fat). Over time, this consistent energy gap results in weight loss.
How is calorie deficit calculated?
Calorie deficit is calculated in two steps. First, you determine your Total Daily Energy Expenditure (TDEE), which combines your Basal Metabolic Rate (BMR) with an activity multiplier. The Mifflin-St Jeor equation is the gold standard for estimating BMR. Second, you subtract your desired deficit from your TDEE. For example, if your TDEE is 2,400 calories and you target a 500-calorie deficit, your daily intake goal would be 1,900 calories.
What is a safe calorie deficit?
Most healthcare professionals recommend a calorie deficit between 300 and 500 calories per day for safe, sustainable weight loss, resulting in 0.5 to 1 pound per week. Men should not consume fewer than 1,500 calories per day, and women should not go below 1,200 calories per day.
Do you lose a pound a week with a 500 calorie deficit?
The traditional 3,500-calorie rule suggests a 500-calorie daily deficit equals 1 pound of weight loss per week. While useful as a starting estimate, research published in the International Journal of Obesity has shown this formula tends to overestimate actual weight loss due to metabolic adaptation.
What are the symptoms of an unhealthy calorie deficit?
Symptoms include persistent fatigue, irritability, difficulty concentrating, hair loss, weakened immune function, loss of menstrual periods in women, muscle loss, intense food cravings, disrupted sleep, and feeling cold. If you experience these symptoms, consult a healthcare provider.
How can you create a healthy calorie deficit?
Focus on nutrient-dense whole foods, prioritize protein intake (0.7-1g per pound of body weight), incorporate resistance training and cardiovascular exercise, stay hydrated, manage stress, and prioritize sleep quality.