Adult BMI calculator
For adults age 20 and older. Not for children, pregnancy, or assessing body composition. BMI does not capture muscle mass or individual risk.
Source: CDC adult BMI guidance ↗Useful calculations, practical movement planning, and reliable information to support a better conversation about your health.
For adults age 20 and older. Not for children, pregnancy, or assessing body composition. BMI does not capture muscle mass or individual risk.
Source: CDC adult BMI guidance ↗See what a percentage change means in pounds or kilograms. A common initial discussion for adults with overweight or obesity is 5–10% over about six months; your appropriate goal may differ.
This is arithmetic, not a recommended target, timeline, or expected result. Do not use it to plan weight loss during pregnancy, an eating disorder, or when underweight.
Source: NIH/NIDDK realistic goals ↗Compare two weights in the same unit. A single change does not explain body composition, fluid shifts, or overall health.
The formula is (earlier weight − current weight) ÷ earlier weight × 100. Unintentional or rapid changes deserve clinical assessment. No data is tracked or stored.
Choose a manageable duration and frequency. This compares moderate-intensity walking minutes with the general adult 150-minute weekly activity guideline.
At moderate intensity you can generally talk but not sing. Gentle walking still matters, but may not count as moderate activity. Start at your ability and increase gradually. Adults also benefit from strength work on two or more days weekly.
Source: CDC adult activity guidance ↗Enter the numbers for one serving from a food label, then the number of servings eaten. The tool multiplies those amounts; it does not prescribe calorie or nutrient goals.
Use the correct per-serving column, not the whole-package column. Serving size is not a recommended amount to eat. Label rounding affects precision; the tool has no food database.
Source: FDA serving-size guidance ↗Short activity periods can fit between daily tasks. Try a brief comfortable walk, indoor movement, or an adapted routine that fits your ability. You do not have to reach a weekly guideline immediately.
Ask your clinician about restrictions if you have mobility limitations or health concerns. Stop activity and seek help for chest pain, faintness, or severe breathlessness.
Build varied meals around vegetables, fruit, whole grains, and protein foods. Compare food labels and notice portion sizes, added sugars, and fiber. Cultural preferences and budget belong in the plan.
For personalized calorie or protein needs, use a clinician or registered dietitian; generic online targets may not fit kidney disease, pregnancy, or other conditions.
Bring a medication list, a brief weight history, prior treatment experiences, relevant health information, and the questions that matter to you.
Ask about follow-up frequency, medication risks, testing, costs, and what to do if your plan becomes difficult to follow.
These are general care pathways. The right option depends on a full assessment, your preferences, safety, and access.
At ECMOS Prolific: start with a weight-management consultation to discuss assessment, lifestyle guidance, treatment options, and follow-up arrangements.
Discuss my options ↗Official public-health and clinical education resources. External sites have their own privacy policies. General information does not establish your eligibility for treatment.
What the measurement can—and cannot—tell you.
CDCAerobic activity, strength work, and getting started.
NIH / NIDDKQuestions to ask and unrealistic claims to recognize.
NIH / NIDDKGeneral benefits, risks, and treatment considerations.
USDA / MYPLATEFood groups and practical nutrition education.
FDAUnderstand servings and the information on food labels.
Sources checked October 16, 2026. Educational content should be reviewed periodically. Calculations use standard arithmetic; this toolkit is not a medical device or clinical decision system.
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