BMI Weight Loss Calculator

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Estimates calorie needs and time required to reach a target weight based on BMI.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Height (inches), Weight (pounds), Target Weight (pounds), Activity Level, and Weekly Calorie Deficit (calories) in the units shown.

Step 2

Read Weight Difference to Target, Activity Multiplier, Basal Metabolic Rate (BMR), BMI, Height (meters), Estimated Weeks to Target, Daily Calorie Needs, Ideal Weight (maximum) - BMI 24.9, and Ideal Weight (minimum) - BMI 18.5 in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Moderate Activity, 180 lbs to 160 lbs

Height (inches): 70; Weight (pounds): 180; Target Weight (pounds): 160; Activity Level: Moderately Active (moderate exercise/sports 3-5 days/week); Weekly Calorie Deficit (calories): 500

Weight Difference to Target: 20 pounds; Activity Multiplier: 1.55; Basal Metabolic Rate (BMR): 1,872.4 calories; BMI: 25.8244898; Height (meters): 1.778; Estimated Weeks to Target: 20 weeks; Daily Calorie Needs: 2,902.22 calories; Ideal Weight (maximum) - BMI 24.9: 173.5391532 pounds; Ideal Weight (minimum) - BMI 18.5: 128.9347123 pounds

Sedentary, 200 lbs to 175 lbs

Height (inches): 72; Weight (pounds): 200; Target Weight (pounds): 175; Activity Level: Sedentary (little to no exercise); Weekly Calorie Deficit (calories): 750

Weight Difference to Target: 25 pounds; Activity Multiplier: 1.2; Basal Metabolic Rate (BMR): 2,022.4 calories; BMI: 27.12191358; Height (meters): 1.8288; Estimated Weeks to Target: 16.66666667 weeks; Daily Calorie Needs: 2,426.88 calories; Ideal Weight (maximum) - BMI 24.9: 183.5973409 pounds; Ideal Weight (minimum) - BMI 18.5: 136.4076629 pounds

Lightly Active, 160 lbs to 150 lbs

Height (inches): 68; Weight (pounds): 160; Target Weight (pounds): 150; Activity Level: Lightly Active (light exercise/sports 1-3 days/week); Weekly Calorie Deficit (calories): 500

Weight Difference to Target: 10 pounds; Activity Multiplier: 1.375; Basal Metabolic Rate (BMR): 1,722.4 calories; BMI: 24.32525952; Height (meters): 1.7272; Estimated Weeks to Target: 10 weeks; Daily Calorie Needs: 2,368.3 calories; Ideal Weight (maximum) - BMI 24.9: 163.7642948 pounds; Ideal Weight (minimum) - BMI 18.5: 121.6722672 pounds

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Important

Use the result as an estimate and confirm any medical decisions with a qualified professional.