Weight Loss Calculators

Free Weight Loss and Health Calculators Body composition Energy and nutrition Goals and planning

Nine tools to understand your body, set a realistic goal, and see what treatment could cost. No login, results in under a minute.

Tools to Measure Body composition

These free weight loss calculators and health tools help you check where you stand today and what a realistic goal looks like. Measure your BMI, body fat, visceral fat, daily calorie burn, protein and macro targets, and projected weight loss. Each tool gives an instant, evidence based estimate, then points you to the next step if you want physician supervised support.

Body composition

BMI Calculator

See whether your BMI sits in a healthy range and if you may qualify for medical weight loss.

Body composition

Body Fat Calculator

Estimate body fat percentage, fat mass, and lean mass using the U.S. Navy formula.

Body composition

Visceral Fat Calculator

Check the dangerous fat around your organs with your waist to height ratio for better health.

Energy and nutrition

TDEE Calculator

Find how many calories you burn each day and your target to lose, maintain, or build.

Energy and nutrition

Macro Calculator

Get daily protein, carb, and fat targets, weighted to protect lean muscle while you lose weight.

Energy and nutrition

GLP-1 Protein Calculator

Hit the protein you need to preserve muscle during GLP-1 weight loss every day.

Goals and planning

Weight Loss Calculator

Project your weekly and monthly weight loss from your calorie target scheduled every day.

Goals and planning

GLP-1 Weight Projection

See your estimated results on semaglutide or tirzepatide, based on clinical trial averages.

Goals and planning

Cost and Savings

Compare brand prices to AHC flat rate pricing and see your savings over a year.

Medical Disclaimer: The calculators on this page provide estimates for informational purposes only and do not constitute medical advice. Results are based on published formulas and clinical reference data, and individual results vary. They do not replace a clinical evaluation. Compounded semaglutide and tirzepatide are not FDA-approved finished drug products. All prescriptions at Alternate Health Club are issued by independently licensed U.S. healthcare providers following individual patient evaluations. Consult a licensed healthcare provider before starting, changing, or stopping any treatment.

Which calculator should I use?

Start with the question closest to what you want to know.

I want to know if I may qualify for treatment

Start with the BMI calculator

I want to understand my body composition

Use the body fat and the visceral fat calculators

I want to know my daily calories

Run the TDEE calculator

I want the right protein and macros

Use the protein calculator, with the macro tool arriving soon

I want to see how fast I could lose weight

Try the weight loss calculator

I want to know what treatment costs

Start with the Coming Soon

Frequently Asked Questions

Are these weight loss calculators free?

Yes. Every calculator on this page is free to use and needs no account or login. Enter your details and your results appear instantly.

How accurate are the calculators?

Each tool uses a validated formula, such as Mifflin-St Jeor for energy needs and the U.S. Navy method for body fat. These give reliable estimates for most people, but they are not a clinical measurement. For exact figures, a provider can order body composition testing.

Which calculator should I start with?

If you want to know whether you may qualify for treatment, start with the BMI calculator. If you want to understand your daily calories and how to lose weight, start with the TDEE calculator. The guide above maps each goal to the right tool.

Do my results mean I qualify for GLP-1 medication?

The calculators can show whether your numbers fall in a range where treatment is often considered, but they do not decide eligibility. A licensed provider determines that after a full evaluation of your health history and goals.

Can GLP-1 treatment help me reach the goals these tools show?

For many patients, yes. GLP-1 medications like semaglutide and tirzepatide reduce hunger and make a calorie deficit easier to hold. Individual results vary and no outcome is guaranteed. A provider will tell you whether treatment is appropriate for you.

Your numbers are the start. We help you change them.

If your results point toward medical weight loss, AHC physicians build a personalized GLP-1 plan around your health profile, all online with no clinic visit.
Compounded semaglutide from $129 a month. Compounded tirzepatide from $169 a month.