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Free health & fitness calculators

Explore adult BMI, estimated maintenance calories and the arithmetic behind a macro split. Each page explains its equation, accepted units and limitations. These tools provide estimates from the values you enter, not measurements of your complete health or personalized treatment advice. Use accurate inputs and read the age restrictions. A clinician or registered dietitian can help interpret results for your circumstances.

BMI calculator

A quick adult body mass index estimate.

Open BMI calculator →

Calorie estimator

Estimate resting and daily maintenance energy.

Open Calorie estimator →

Macro calculator

Turn your calorie target into protein, fat and carbs.

Open Macro calculator →

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Distinguish measurements from estimates

Height, weight, age and activity inputs are not interchangeable. BMI uses height and weight; calorie estimation adds an equation and an activity assumption; macro calculations divide a chosen calorie total. The result of one tool does not automatically establish a suitable target for another.

Use the stated population and scope

The BMI categories here are for adults aged 20 and over. The calorie estimator accepts adults aged 18–100. These tools do not assess pregnancy, growth in children or clinical nutrition needs. Read the source linked on each tool page and discuss health decisions with a qualified professional.

Category questions

How do I choose from these tools?

Height, weight, age and activity inputs are not interchangeable. BMI uses height and weight; calorie estimation adds an equation and an activity assumption; macro calculations divide a chosen calorie total. The result of one tool does not automatically establish a suitable target for another.

What should I check before using the result?

The BMI categories here are for adults aged 20 and over. The calorie estimator accepts adults aged 18–100. These tools do not assess pregnancy, growth in children or clinical nutrition needs. Read the source linked on each tool page and discuss health decisions with a qualified professional.

Do these tools require an account?

No. The listed utilities are free to use with no tool signup. Read the individual page for input limits and processing details.