Omikuji Tools Life & Calc

BMI, BMR & Calorie Calculator

BMI, ideal weight, basal metabolic rate, daily calorie needs and diet targets from height, weight, age, sex and activity level – calculated as you type.

✨ Features

  • BMI with WHO category, ideal weight, normal-weight range and slim weight
  • BMR from both the Mifflin-St Jeor and the revised Harris-Benedict equations
  • Daily calorie needs (TDEE) from your activity level, plus intake targets for losing, maintaining and gaining
  • Enter a target weight to see the calorie balance and estimated days; everything updates as you type

🪄 Use cases

Planning a diet

See how many calories per day give a 0.5 kg weekly loss.

Health check-ups

Know your BMI category and distance from the ideal weight.

Bulking

Maintenance calories plus 250–500 kcal for lean gains.

Family health

Compare BMR across ages and sexes.

🔒 Privacy

Your inputs are processed in your browser and never sent to a server. Only when you shorten a share URL is that URL (including the input) sent to the shortening service.

❓ FAQ

How is BMI calculated?

Weight (kg) divided by height (m) squared. Ideal weight is the weight at BMI 22, i.e. 22 × height(m)².

What is the difference between the two BMR equations?

Mifflin-St Jeor (1990) is considered the more accurate for modern populations and is the default in most calculators. The revised Harris-Benedict (1984) is older and tends to give slightly higher values.

What activity factors are used for TDEE?

Sedentary 1.2, lightly active 1.375, moderately active 1.55, very active 1.725, extra active 1.9, multiplied by BMR.

How are the weight-loss targets calculated?

Assuming 1 kg of body fat ≈ 7,200 kcal, a 0.5 kg weekly loss needs about 514 kcal/day less (shown as 500). Targets never go below BMR.

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Enter your height, weight and age to see your BMI and category, healthy weight range, basal metabolic rate, daily calorie needs and diet targets at once.

Look up restaurant calories

Once you know your daily target, check the calories of what you actually eat on our sister site: official nutrition data from Japanese restaurant chains (KFC, MOS Burger, Osaka Ohsho and more), searchable and comparable.

Browse menu calories on calories.omikuji.dev →