BMI and Calorie Calculator
Choose BMI to see your weight category and ideal weight for your height, or Calories to see how many calories and grams of protein, carbs and fat you need each day for your goal.
How is BMI calculated?
BMI = weight in kg ÷ (height in metres × height in metres). For 70 kg and 1.75 m: 70 ÷ 3.0625 = 22.9, a healthy weight.
| BMI | Category (WHO) |
|---|---|
| Below 18.5 | Underweight |
| 18.5 to 24.9 | Healthy weight |
| 25 to 29.9 | Overweight |
| 30 and above | Obesity |
How are calories for bulking and cutting calculated?
Your basal metabolic rate comes from the Mifflin-St Jeor equation (10 × weight + 6.25 × height − 5 × age, + 5 for men or − 161 for women), multiplied by your activity level. For cutting we subtract 20%, for bulking we add 10%. Protein is 2 g per kg when cutting, 1.6 to maintain and 1.8 to bulk; fat is 25% of calories and the rest is carbs.
BMI does not tell muscle from fat and does not suit children or pregnant women. Ask a doctor for a full assessment.
Frequently asked questions
What is a healthy BMI?
How many calories do I need to bulk?
How much protein do I need per day?
Official sources
Results are estimates for guidance and do not replace the official authority or professional advice.