Metric — healthy range
Input
175 cm · 70 kg · WHOOutput
BMI 22.9 — Normal (18.5–24.9)70 ÷ (1.75)² ≈ 22.9. Healthy weight for 175 cm ≈ 56.7–76.3 kg.
Calculate your BMI from height and weight—metric (kg/cm) or imperial (lb/ft/in). Get your adult category, healthy weight range, and optional waist-to-height screening. BMI is a screening estimate for adults, not a medical diagnosis.
BMI is a screening tool for adults—not a diagnosis. Formulas follow WHO/CDC adult standards. Children need age- and sex-specific percentiles (CDC).
BMI (Body Mass Index) estimates whether weight is in a typical range for height. Adults use fixed WHO cutoffs; children and teens need age- and sex-specific BMI-for-age percentiles instead.
**How to calculate BMI**
**WHO adult categories (international):** underweight <18.5, healthy 18.5–24.9, overweight 25–29.9, Obese Class I 30–34.9, Class II 35–39.9, Class III ≥40.
**Asia-Pacific mode (optional):** overweight from BMI 23; higher-risk bands from 27.5 (WHO expert consultation public-health action points). Choose this only when that guidance applies to you—discuss with a clinician.
**Limitations:** BMI does not measure body fat, muscle, or fat distribution. Optional waist and waist-to-height ratio (WHtR) add central-adiposity context. This tool is a screening estimate for adults—not a diagnosis.
Enter height and weight to see your BMI, adult category, and healthy weight range—screening only, not a medical diagnosis.
Adults checking weight status
Answer “what is my BMI?” from height and weight with clear category labels.
US customary users
Use imperial inputs with the standard 703 multiplier—no manual conversion.
Metric users
Enter centimeters and kilograms for the WHO metric formula.
People comparing category standards
Toggle Asia-Pacific mode when population-specific guidance uses BMI 23 / 27.5 action points.
Anyone under 18
Use CDC Child and Teen BMI tools—adult cutoffs on this page do not apply.
Input
175 cm · 70 kg · WHOOutput
BMI 22.9 — Normal (18.5–24.9)70 ÷ (1.75)² ≈ 22.9. Healthy weight for 175 cm ≈ 56.7–76.3 kg.
Input
5 ft 10 in · 180 lb · WHOOutput
BMI 25.8 — Overweight (25.0–29.9)703 × 180 ÷ 70² ≈ 25.8. Healthy weight at 5′10″ ≈ 129–174 lb.
Input
170 cm · 68 kg · Asia-PacificOutput
BMI 23.5 — Overweight (23–27.4 Asia-Pacific)Same BMI is Normal on WHO international (18.5–24.9) but Overweight under Asia-Pacific action points.
Input
180 cm · 95 kg · low body fatOutput
BMI 29.3 — Overweight on WHOBMI cannot separate muscle from fat. Pair with body fat % or waist when muscular.
Standard adult screening bands used by CDC and most US references.
| Category | BMI range |
|---|---|
| Underweight | Below 18.5 |
| Normal (healthy weight) | 18.5 – 24.9 |
| Overweight | 25.0 – 29.9 |
| Obese Class I | 30.0 – 34.9 |
| Obese Class II | 35.0 – 39.9 |
| Obese Class III | 40 and above |
Screening categories only—not a medical diagnosis.
Same BMI formula; different category cutoffs when Asia-Pacific mode is selected.
| Category | WHO international | Asia-Pacific mode |
|---|---|---|
| Underweight | <18.5 | <18.5 |
| Normal | 18.5–24.9 | 18.5–22.9 |
| Overweight | 25–29.9 | 23–27.4 |
| Obese Class I | 30–34.9 | 27.5–32.4 |
| Obese Class II | 35–39.9 | 32.5–37.4 |
| Obese Class III | ≥40 | ≥37.5 |
Asia-Pacific bands follow WHO expert-consultation action-point style cutoffs (23 / 27.5 / 32.5 / 37.5). Not universal for every individual.
Illustrative results; enter your own values above for a precise figure.
| Height | Weight | Approx. BMI | Category |
|---|---|---|---|
| 5′0″ | 120 lb | 23.4 | Normal |
| 5′5″ | 150 lb | 25.0 | Overweight |
| 5′10″ | 180 lb | 25.8 | Overweight |
| 6′0″ | 200 lb | 27.1 | Overweight |
Common metric checks; calculator rounds to one decimal.
| Height | Weight | Approx. BMI | Category |
|---|---|---|---|
| 160 cm | 55 kg | 21.5 | Normal |
| 170 cm | 70 kg | 24.2 | Normal |
| 175 cm | 80 kg | 26.1 | Overweight |
| 180 cm | 90 kg | 27.8 | Overweight |
Keep keyword ownership clear—use the right tool for the question.
| Question | Use |
|---|---|
| What is my BMI / category? | This BMI Calculator |
| Target weight from height formulas | Ideal Weight Calculator |
| Body fat % | Body Fat Calculator |
| Daily calories / BMR | Calorie Calculator |
| Child BMI percentile | CDC Child & Teen BMI (external) |
Adult BMI uses the Quetelet index. Categories follow WHO international cutoffs, or Asia-Pacific public-health action points when that mode is selected. Healthy weight range back-calculates the selected healthy BMI band at your height.
Formula
Metric: BMI = weight(kg) ÷ height(m)²
Imperial: BMI = 703 × weight(lb) ÷ height(in)²
Healthy weight (WHO): 18.5 × h² to 24.9 × h²
Healthy weight (Asia-Pacific mode): 18.5 × h² to 22.9 × h²Same time of day, barefoot height, similar clothing weight.
Central fat can elevate risk even when BMI is “normal.”
Use CDC/WHO BMI-for-age percentiles for under 18. Adult bands on this page are wrong for kids.
Use BMI as one screening input. Discuss results with a healthcare provider before medical decisions.
Use the unit toggle. Imperial BMI requires 703 × lb ÷ in².
Toggle Asia-Pacific only when that guidance is relevant; confirm with a clinician.
This tool does not compute CDC/WHO growth-chart percentiles.
Use Body Fat or Lean Body Mass calculators—BMI is weight-for-height only.
Not a clinical assessment, obesity diagnosis, or prescribing tool.
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Enter your height and weight above. Metric: divide kg by height in meters squared. Imperial: multiply lb by 703, then divide by height in inches squared. The result is your BMI; adult categories map that number to underweight through Obese Class III.
On WHO international cutoffs, a healthy (normal) BMI is 18.5–24.9. Asia-Pacific mode uses a narrower healthy band of 18.5–22.9. This calculator also shows the matching healthy weight range for your height.
Convert cm to meters (divide by 100), square height, then divide weight in kg by that value. Example: 70 kg at 175 cm → 70 ÷ 1.75² ≈ 22.9.
BMI = 703 × weight(lb) ÷ height(in)². Example: 180 lb at 70 in (5′10″) → 703 × 180 ÷ 4900 ≈ 25.8. Enter feet and inches separately in this tool.
No. The BMI formula is the same. Optional waist thresholds differ by sex; women often have higher body fat than men at the same BMI. Categories here do not use separate male/female BMI cutoffs.
The adult formula does not change with age. Interpretation can. Children need percentiles. Some clinicians interpret older adults differently—discuss with a healthcare provider. Entering age under 18 only shows a warning; it does not switch to pediatric charts.
WHO expert consultation described lower public-health action points for many Asian populations (notably overweight around BMI 23 and higher risk around 27.5). Select Asia-Pacific mode to apply those category bands and a healthy weight range of BMI 18.5–22.9. They are not automatic for every person—use clinical judgment.
Not for category interpretation. Under 18 requires BMI-for-age and sex percentiles (CDC Child and Teen BMI Calculator). Adult fixed cutoffs on this page do not apply to kids or teens.
Standard adult BMI categories are not designed for pregnancy. Weight-gain targets depend on pre-pregnancy BMI and gestational week—follow obstetric guidance. This tool can warn if you mark pregnancy; it does not provide gestational targets.
WHtR = waist ÷ height. Some guidelines flag values ≥0.5 as increased central adiposity even when BMI is normal. Enter an optional waist measurement to see WHtR alongside BMI.
No. BMI is a screening classification. It does not diagnose disease, prescribe treatment, or replace labs, waist measures, or clinical assessment.
Core calculations run in your browser. Height and weight are not uploaded to EverydayTools servers for normal use. Optional local save uses device storage only.
On WHO international cutoffs, BMI ≥30 is obesity, subdivided into Class I (30–34.9), Class II (35–39.9), and Class III (≥40). Asia-Pacific mode uses different higher-risk bands starting at 27.5.
A common healthy weight range uses BMI 18.5–24.9 (or 18.5–22.9 in Asia-Pacific mode) converted to kg or lb for your height. This calculator displays that range automatically.
BMI is a fast height–weight screen. Body fat % estimates composition. Athletes and older adults often need body fat or waist context beyond BMI alone—use the Body Fat Calculator when that is the question.
BMI calculations run in your browser. Height and weight are not uploaded to EverydayTools servers for core use. Optional local save uses browser storage on your device.
Matches WHO/CDC adult BMI formulas for equivalent metric inputs. Imperial uses the standard 703 multiplier (±0.1–0.2 possible from rounding).
Client-side JavaScript only for core calculation—confirm in your browser Network tab if needed.
Cross-check with the CDC Adult BMI Calculator or NHLBI tool using the same height and weight.
Limitations: Adult screening only. No child percentiles, no clinical diagnosis, no body-fat measurement. Asia-Pacific mode is optional guidance. Pregnancy uses a warning, not gestational targets.
General BMI screening estimate only—not medical advice, diagnosis, or treatment. Consult a healthcare provider for personal health decisions.
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Reviewed by EverydayTools Editorial Team on 2026-09-06.
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Calculate your BMI
Adult BMI from height and weight—WHO or Asia-Pacific categories, healthy weight range, optional waist. Private in your browser.
BMI is a screening tool — consult a doctor for medical advice. Formulas follow WHO & NIH guidelines.
Measure around your bare abdomen at navel level after a normal exhale. Pairing waist with BMI improves screening for central obesity.
Under 18 triggers pediatric guidance.
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Calculations run in your browser — height and weight are never uploaded.