Health calculators

Estimate adult BMI, waist-to-height ratio, BMR, TDEE, calorie targets, and nutrition-label servings with formulas, practical limits, and clear next steps.

BMI Calculator

Calculate adult body mass index from height and weight locally in your browser.

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BMR Calculator

Estimate basal metabolic rate with the Mifflin-St Jeor formula locally in your browser.

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TDEE Calculator

Estimate total daily energy expenditure from BMR and activity level locally in your browser.

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Calorie Goal

Estimate a daily calorie target for maintenance, fat loss, or weight gain locally in your browser.

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Waist-to-Height Ratio

Calculate adult waist-to-height ratio with metric or US customary units and compare it with the half-your-height screening guideline.

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Nutrition Serving Calculator

Scale Nutrition Facts values from the labeled serving to the amount eaten, with optional US Daily Value percentages.

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Choose a health calculator by the question you are asking

These calculators are useful starting estimates, not diagnoses or personalized treatment. Use the result to understand a formula, then compare it with longer-term measurements, habits, and professional guidance when needed.

Use BMI for a quick height-to-weight screening value, not a direct body-fat measurement.
Use BMR as the resting-energy estimate, then TDEE when normal daily activity also needs to be included.
Treat a calorie goal as a starting range and review two to four weeks of weight, waist, food, and training records before adjusting it.

Task	Start with	Why
Calculate adult body mass index	BMI Calculator	Uses height and weight for a common adult screening reference.
Estimate calories used at rest	BMR Calculator	Uses the Mifflin-St Jeor equation as a resting-energy estimate.
Estimate maintenance calories	TDEE Calculator	Adds an activity factor to the BMR estimate.
Plan a maintenance, loss, or gain target	Calorie Goal Calculator	Compares a selected goal with estimated TDEE.
Compare waist size with height	Waist-to-Height Ratio Calculator	Uses the same unit for waist and height and explains the half-height screening guideline.
Scale a Nutrition Facts serving	Nutrition Label Serving Calculator	Recalculates listed nutrients for the amount actually eaten.