Calorie Deficit Calculator

This calculator is designed to help you estimate how many calories you need to consume to reach your target weight. Get recommendations based on your results, including whether Weight Loss by Wellis is right for you.

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Your calorie needs

To maintain current weight

-- calories/day

Adjustment of energy intake

Lose weight weekly

-- calories/day

Details of your goal

  • BMR: -- kcal
  • Total weight loss: -- kg
  • Target weight: -- kg
  • Expected weeks: --
  • Expected days: --
  • Weight loss per week: -- kg/week

Calorie Deficit Calculator – How much should you cut to lose weight?

What is a calorie deficit?

A calorie deficit occurs when you eat fewer calories than your body burns. Your body will then start burning fat, causing you to lose weight.

Calorie Deficit Calculator

Gender: Male / Female
Age
In years
Current weight
In kilograms (kg)
Height
In centimeters (cm)
Activity level
  • Sedentary (little or no exercise)
  • Lightly active (light exercise 1–3 days/week)
  • Moderately active (3–5 days/week)
  • Very active (6–7 days/week or physical job)
  • Extremely active (athlete or training twice a day)
Target weight
In kilograms (kg)
Weight loss per week
  • 0.25 kg/week (275 kcal deficit/day)
  • 0.5 kg/week (500 kcal deficit/day)
  • 0.75 kg/week (750 kcal deficit/day)
  • 1 kg/week (1000 kcal deficit/day)
Body fat percentage (optional)
In %, for a more accurate TDEE calculation
Your calorie deficit: [XXX] kcal/day

Weight loss rate

Calorie deficit per day
Weight loss rate Calorie deficit per day
0.5 kg/weekApprox. 500 kcal
1 kg/weekApprox. 1000 kcal

Note: this calculator provides a rough estimate of your required calorie deficit. It does not take into account personal health factors such as pregnancy, muscle mass, or medical conditions and is not intended as a medical diagnosis.

Healthy weight loss: what to keep in mind

Eat enough protein
When eating fewer calories, you risk losing muscle mass as well. You want to avoid this. Protein helps you maintain muscle mass, which is beneficial for your metabolism. Think of chicken, fish, eggs, yogurt, or plant-based options such as tempeh or lentils.
Tip: Try to include a protein source in every meal.

Be active
For your health and weight loss process, it’s important to keep moving. Walking, cycling, strength training, or simply being more active in daily life all count. Exercise supports fat burning and helps your body stay strong and fit.
Tip: Choose something you enjoy so you’ll stick with it longer.

Stay hydrated
Drinking water not only keeps you hydrated but also supports your metabolism and fat burning. Many people mistake thirst for hunger, so drinking enough can also help reduce snacking.
Tip: Start your day with a big glass of water and always carry a refillable bottle.

Get enough sleep
Sleep has a major impact on your hormones. Sleep deprivation increases appetite (especially for sugar and fat) and lowers your motivation to be active. It also slows your recovery after exercise.
Tip: Aim for at least 7 hours of sleep per night for optimal recovery and balance.

Extra tips for a calorie deficit

  • Avoid crash diets: a too-large deficit slows down your metabolism and can lead to muscle loss.
  • Keep your energy up: choose nutritious, filling foods such as vegetables, protein-rich foods, and whole grains.

Symptoms of an unhealthy calorie deficit

  • Fatigue
  • Persistent hunger
  • Feeling cold
  • Mood swings
  • Problems with hair, skin, and nails

Want to lose weight and curious whether you qualify for weight loss medication? Fill out our short questionnaire and find out right away.