Body Statistics Calculator: BMI, Body Fat, BMR & Calories

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Formula at a glance

Body Statistics Calculator: BMI — weight (kg) ÷ height (m)². Example: Man, 30, 175 cm, 78 kg → BMI: 25.5 — Overweight (Obese on the Asian scale) — How the Body Statistics Calculator works: BMI — weight (kg) ÷ height (m)²

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📘 About the Body Statistics Calculator

BMI is a quick screen for weight, but it says nothing about where fat sits or how much muscle you have. This calculator adds body fat (by the US Navy tape method if you enter waist and neck), lean mass, waist-to-height and waist-to-hip ratios, plus your energy needs.

It uses well-known formulas: Mifflin–St Jeor for BMR, an activity factor for daily calories, Devine for ideal body weight, Watson for total body water and Mosteller for body surface area. For people of South Asian origin it also shows the Asian BMI cut-offs used by ICMR and WHO.

🧮 Formula

BMI

weight (kg) ÷ height (m)²

BMR (Mifflin–St Jeor)

10 × kg + 6.25 × cm − 5 × age + 5 (men) or − 161 (women)

Body fat (US Navy, men)

495 ÷ (1.0324 − 0.19077 log(waist − neck) + 0.15456 log(height)) − 450

Body surface area (Mosteller)

√(cm × kg ÷ 3600)

✏️ Worked examples

Man, 30, 175 cm, 78 kg

You enter
Sex	Male
Age	30 years
Height	175
Height in	cm
Your weight	78 kg
Weight in	kg
Activity	Light (exercise 1–3 days a week)
Waist (optional)	88 cm
Neck (optional)	38 cm

You get
BMI	25.5 — Overweight (Obese on the Asian scale)
Healthy weight for your height	56.7–76.3 kg (Asian scale up to 70.1 kg)
Ideal body weight (Devine formula)	70.5 kg
Body fat	19.2% (US Navy tape method)
Lean body mass	63 kg; fat mass 15 kg
BMR (calories at complete rest)	1,729 kcal a day
Daily calories to keep your weight (light exercise 1–3 days a week)	2,377 kcal
To lose about 0.5 kg a week	1,877 kcal a day
Protein need (0.8–1.2 g per kg)	62–94 g a day
Water to drink	2.7 litres a day (about 35 ml per kg)
Total body water (Watson)	44.6 litres (57% of your weight)
Body surface area (Mosteller)	1.95 m²
Waist-to-height ratio	0.5 — increased risk

25.5 — Overweight (Obese on the Asian scale); body fat 19.2% (US Navy tape method).

Woman, 35, 5 ft 4 in, 62 kg

You enter
Sex	Female
Age	35 years
Height	5.4
Height in	feet.inches (5.7 = 5 ft 7 in)
Your weight	62 kg
Weight in	kg
Activity	Moderate (3–5 days)
Waist (optional)	78 cm
Neck (optional)	32 cm
Hip (optional, women)	98 cm

You get
BMI	23.5 — Healthy weight (Overweight on the Asian scale)
Healthy weight for your height	48.9–65.8 kg (Asian scale up to 60.5 kg)
Ideal body weight (Devine formula)	54.7 kg
Body fat	31.1% (US Navy tape method)
Lean body mass	42.7 kg; fat mass 19.3 kg
BMR (calories at complete rest)	1,300 kcal a day
Daily calories to keep your weight (moderate exercise 3–5 days)	2,015 kcal
To lose about 0.5 kg a week	1,515 kcal a day
Protein need (0.8–1.2 g per kg)	50–74 g a day
Water to drink	2.2 litres a day (about 35 ml per kg)
Total body water (Watson)	30.6 litres (49% of your weight)
Body surface area (Mosteller)	1.67 m²
Waist-to-height ratio	0.48 — healthy
Waist-to-hip ratio	0.8 — healthy

23.5 — Healthy weight (Overweight on the Asian scale).

🧭 How to use this calculator

What you enter

Sex
Age (years)
HeightIn cm, or feet.inches like 5.7 for 5 ft 7 in when you choose feet.
Height in
Your weight (kg)
Weight in
Activity
Waist (optional) (cm)At the navel, for body fat and waist ratios.
Neck (optional) (cm)
Hip (optional, women) (cm)

What you get

BMI
Healthy weight for your height
Ideal body weight (Devine formula)
Body fat
Lean body mass
BMR (calories at complete rest)
Daily calories to keep your weight (light exercise 1–3 days a week)
To lose about 0.5 kg a week
Protein need (0.8–1.2 g per kg)
Water to drink
Total body water (Watson)
Body surface area (Mosteller)

💡 How to measure

Weigh yourself in the morning before breakfast.
Measure waist at the navel, relaxed, after breathing out.
Measure the neck just below the Adam's apple.
For hips, measure at the widest point.

❓ Frequently asked questions

What is a healthy BMI for Indians?

ICMR and WHO's Asian cut-offs treat 18.5–22.9 as healthy, 23–24.9 as overweight and 25+ as obese, because South Asians tend to have more body fat at the same BMI.

Which body fat method is most accurate?

DEXA scans are the most accurate. The US Navy tape method is usually within 3–4% for most people; the BMI-based estimate is rougher.

What is BMR?

Basal metabolic rate: the calories your body burns at complete rest to stay alive. Your daily need is BMR × an activity factor (1.2–1.9).

📏 Body Statistics Calculator: BMI, Body Fat, BMR & More