Explore your BMI, estimated basal metabolism and daily calorie needs in a few seconds.
Enter your details for an estimate. No account needed.
See the indicators together, understand their limitations and use estimates as information — not as a diagnosis or diet.
Estimates based on the inputs provided. They do not replace a professional assessment.
Visual scale from 15 to 45. Values outside it are placed at the ends; the number and category use the full BMI value.
This result is close to a boundary: the category uses the full value before rounding.
A screening indicator. It does not directly measure body fat or diagnose a condition.
The Mifflin–St Jeor equation estimates energy expenditure at rest. It is not an individual measurement of basal metabolism.
Resting energy × activity factor. Actual expenditure may differ.
An illustrative scenario, not a personal target or dietary prescription.
The 10% adjustments are mathematical examples chosen for this tool, not universal recommendations. They do not predict weight loss or gain.
Weight range corresponding to the conventionally defined healthy adult BMI range.
For the height entered, using BMI from 18.5 to below 25. Displayed limits are rounded inward in 0.1 kg steps.
Muscle mass, age, body composition, health conditions and medicines can change their interpretation. Athletes, older adults and people with clinical needs should seek individual advice before making dietary changes.
Look up foods, build complete meals and explore the calories, protein, carbohydrates and fat in your food.
A future, independent TOOLSIA tool. Not available yet.
Body mass index relates weight to height: divide weight in kilograms by height in metres squared. It provides an adult screening reference, rather than a complete account of someone's health.
No. BMI cannot distinguish muscle, fat, bones or fluid. People with high muscle mass can have a high BMI without sharing the same body composition as others. A clinical assessment adds context.
It is the energy required for vital functions under specific basal conditions. Here, Mifflin–St Jeor estimates resting expenditure as an approximation of BMR. A direct measurement and a population-based estimate are different things.
Resting energy is only part of a day. Total daily energy expenditure also includes movement, exercise and digestion. We multiply estimated resting energy by an approximate activity factor to calculate TDEE.
Work, travel, household tasks and training all contribute. One exercise session does not describe the rest of your day. The five factors simplify activity and may overestimate or underestimate your routine.
The equation does not know your body composition, health conditions, medicines or training adaptations. Individual responses vary. The original Mifflin–St Jeor study included adults aged 19 to 78; estimates outside that range require additional care.
Male coefficient: +5. Female coefficient: −161. This equation estimates resting expenditure and is often used to approximate BMR. The difference between coefficients comes from statistical fitting between the groups studied; it does not measure your individual body composition.
| Unrounded BMI | Conventional category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 to below 25 | Healthy weight range |
| 25 to below 30 | Overweight |
| 30 to below 35 | Class I obesity |
| 35 to below 40 | Class II obesity |
| 40 and above | Class III obesity |
| Sedentary | × 1.20 |
|---|---|
| Lightly active | × 1.375 |
| Moderately active | × 1.55 |
| Very active | × 1.725 |
| Extremely active | × 1.90 |
These five multipliers are product-level approximations, not constants in the original equation or a validated clinical scale. Your routine description may not match your actual expenditure.
Yes. No sign-up is needed and the body measurements entered are not saved. You can clear your inputs when you finish.
No. This version is for adults aged 20 and over. BMI interpretation for children and teenagers needs age- and sex-specific references; adult categories will not be applied.
No. These stages have specific requirements. Calculation is blocked without confirmation of the intended audience; seek appropriate individual care.
No. Categories always use the full BMI value. Only the displayed number is rounded. If rounding crosses a category boundary, an explanatory note is shown.
No. The −10% and +10% scenarios are mathematical examples with no prediction of weight change. Reduction is not shown for BMI below 18.5, and adjustments are not shown when estimated TDEE is below 1,600 kcal/day. The latter is a conservative product guard, not an individual minimum energy requirement.
We show conventional adult ranges, not an individual assessment. Changes in muscle mass and other factors can limit interpretation in older adults. Health and nutrition needs should be considered in context.
No. Each language opens a separate page with an empty form. Body measurements are not placed in the URL or transferred between pages.
A food and meal calculator is planned as an independent tool. It is not available yet; the card below has no link to avoid sending you to a missing page.
For information only. Formulas and limitations reviewed on November 3, 2026. Neither BMI categories nor this equation assess your individual health.
Form inputs are not used for advertising or analytics. The hosting provider may process technical access data, such as IP addresses, to deliver and protect the page. See the privacy policy.