BMI Calculator
Body Mass Index from height and weight.
Your BMI
Healthy weight22.9
kg/m²Introduction
Body Mass Index is a quick screen for whether your weight falls in a healthy range for your height. It doesn’t know your muscle mass, so treat it as a starting point — not a verdict.
What is BMI Calculator?
BMI Calculator helps you body mass index from height and weight. It belongs to the Body composition group within health and fitness tools on The Daily Tools. Enter your values, get an immediate result, and adjust inputs to explore different scenarios.
Definition: BMI Calculator is a free, browser-based calculator that body Mass Index from height and weight.
Formula
BMI = weight (kg) ÷ height (m)²
How it works
Formula. BMI = weight (kg) / height (m)². Imperial inputs are converted to metric first.
Categories. The ranges shown follow the World Health Organization’s adult classification. Different guidance applies to children, pregnant people and some ethnic groups.
Limits. BMI does not distinguish muscle from fat, so it can misclassify athletes as overweight. Pair it with a body-fat estimate for a fuller picture.
Worked example
Example: BMI for a 70 kg person who is 175 cm tall
Inputs: Weight = 70 kg, Height = 175 cm
- Convert height to metres: 175 cm ÷ 100 = 1.75 m
- Square height: 1.75² = 3.0625
- Divide weight by height²: 70 ÷ 3.0625 = 22.9
BMI ≈ 22.9 — within the normal weight range (18.5–24.9).
Use cases
- Quick body composition estimates during planning or study
- Comparing scenarios by adjusting inputs in the BMI Calculator
- Private calculations when you don't want data uploaded to third-party servers
- Searching for "bmi" and needing an instant answer
- Searching for "body mass index" and needing an instant answer
Advantages
- 100% browser-based — your data never leaves your device
- No sign-up, no ads required to calculate
- Instant results with a clean, readable interface
- Works offline after the page loads
- Transparent formula shown on this page
Limitations
- Results are estimates — not professional medical, financial, legal, or religious advice
- Individual health varies — consult a healthcare provider for personal guidance
- The Daily Tools does not save your history between sessions
Frequently asked questions
- Is BMI accurate for athletes?
- Not always — muscle weighs more than fat, so muscular people often land in the ‘overweight’ band. Use the body-fat calculator alongside it.
- Does BMI apply to children?
- No. Children use age- and sex-specific BMI percentiles, not the adult 18.5–24.9 range.
Sources & references
- World Health Organization — BMI classification
- Mifflin-St Jeor equation (BMR/TDEE tools) — Standard resting metabolic rate estimate
- The Daily Tools Methodology
Key points
- BMI Calculator is a free, browser-based calculator that body Mass Index from height and weight.
- Formula: BMI = weight (kg) ÷ height (m)²
- Private, browser-only processing
- Related search: bmi
- Related search: body mass index