14 categories
See all →
  1. Home
  2. Health & Fitness
  3. BMI Calculator

BMI Calculator

Calculate your Body Mass Index and health category

0
—
—
Underweight
<18.5Normal
18.5–25Overweight
25–30Obese
>30
BMI0
Category—
Ideal Weight Range—
Weight to Lose/Gain—
BMR (Daily Calories)—
Advertisement
BMI Categories (WHO Standard)
BMI RangeCategoryHealth Risk
< 16Severely UnderweightVery High
16 – 18.4UnderweightModerate
18.5 – 24.9Normal WeightLow
25 – 29.9OverweightIncreased
30 – 34.9Obese Class IHigh
35 – 39.9Obese Class IIVery High
≥ 40Obese Class IIIExtremely High

BMI is a screening tool, not a diagnostic tool. Consult a healthcare provider for proper assessment.

Advertisement

What is BMI Calculator?

Free BMI calculator. Calculate Body Mass Index in metric or imperial units. Find your health category, ideal weight range, and health tips. Health calculators aligned with Indian dietary guidelines and South Asian health benchmarks. TekPulse's BMI Calculator is completely free — no signup, no ads in results, and no data stored on our servers.

How to Use BMI Calculator Online

  1. Select your preferred unit: metric (kg, cm) or imperial (lbs, feet/inches)
  2. Enter your weight in kilograms (or pounds)
  3. Enter your height in centimetres (or feet and inches)
  4. Your BMI is calculated instantly with your category: Underweight, Normal, Overweight, or Obese
  5. For South Asian users, note that Indian guidelines set the overweight threshold at BMI 23+

BMI Calculator Formula & Calculation

BMI = Weight (kg) ÷ [Height (m)]² | Imperial: BMI = [Weight (lbs) × 703] ÷ [Height (inches)]²

WHO Categories: Underweight < 18.5 | Normal 18.5–24.9 | Overweight 25–29.9 | Obese ≥ 30.
Indian/Asian cutoffs (ICMR): Overweight ≥ 23 | Obese ≥ 25 — adjusted for higher visceral fat at the same BMI vs Western populations.

Example: Weight = 70 kg, Height = 170 cm (1.70 m). BMI = 70 ÷ 2.89 = 24.2.
WHO: Normal. ICMR (Indian guideline): Overweight — metabolic risk screening recommended.

Key Factors That Affect Your Result

  1. Muscle mass — BMI cannot distinguish fat from muscle. A 75 kg bodybuilder with 12% body fat and a 75 kg sedentary person with 32% body fat get the same BMI. Use body fat % or waist circumference alongside BMI.
  2. South Asian risk adjustment — Indians develop Type 2 diabetes, hypertension, and heart disease at a BMI of 23–25, whereas the equivalent risk appears at BMI 27–30 in Caucasians. Use ICMR cutoffs for Indian adults.
  3. Waist circumference — More predictive of cardiovascular risk than BMI. High risk: men > 90 cm, women > 80 cm (Indian standards per Consensus Statement, 2008). Measure at the navel, not hips.
  4. Age consideration — BMI thresholds are for adults (18–65). Children use age-gender-specific percentile charts. For adults 65+, a BMI of 22–27 is associated with better outcomes than the standard normal range.

Why Use TekPulse BMI Calculator?

Runs Entirely in Your Browser
BMI, ideal weight range, and BMR are computed instantly with JavaScript — nothing is uploaded or stored
WHO-Standard BMI Formula
Uses the standard weight(kg) / height(m)² calculation and WHO category bands (underweight to obese class III)
Mifflin-St Jeor BMR Estimate
Also estimates daily calorie burn at rest using the Mifflin-St Jeor equation based on age and gender
Metric & Imperial Units
Switch between kg/cm and lb/ft-in without re-entering your details

Share & Embed

Help others discover this free tool. Share it or embed it on your website.

WhatsApp X/Twitter LinkedIn

Free to embed with attribution link to tekpulse.in

Related Guides

Understanding BMI: A Complete Health Guide for Indians

Frequently Asked Questions

BMI (Body Mass Index) is a measure of body fat based on height and weight. It is calculated as weight (kg) / height (m)². It is a screening tool, not a diagnostic measure.

For adults: Below 18.5 = Underweight, 18.5–24.9 = Normal weight, 25–29.9 = Overweight, 30 and above = Obese. For Asians, a BMI of 23+ is considered overweight.

BMI does not account for muscle mass, bone density, or body fat distribution. Athletes may have high BMI but low body fat. It is best used alongside other health metrics.

A combination of a calorie-controlled diet and regular physical activity (150+ minutes of moderate exercise per week) is the most effective way to reduce BMI sustainably.

Was this tool helpful?