Health

1 tool - Calorie, BMI, water and nutrition calculators.

Get your daily calorie target for fat loss, muscle gain, or body recomposition - plus a personalized 7-day regional meal plan.

About the category

The Health category is a set of tools for understanding and improving your body: calorie and macro targets, water intake, BMI, body fat estimates, workout tracking, sleep quality, heart rate zones, and reference tables for nutrition. Whether you are a beginner who just wants to figure out your daily calories or someone deep into fitness optimization, this category gives you clear numbers, honest formulas, and no black boxes.

How to choose a tool

If you want to lose weight or gain muscle

Start with the Calorie Calculator. It produces your daily calorie target, macro breakdown in grams, water intake, and a personalized 7-day meal plan.

If you want to understand the formula behind it

Read the About section on the Calorie Calculator page - it explains the Mifflin-St Jeor equation, TDEE, BMR, and why they differ.

If you track fitness metrics

Use the same Calorie Calculator to compare targets across different goals (cut, maintenance, bulk) and different activity levels.

Frequently Asked Questions

Is the calorie calculator accurate? v

It uses the Mifflin-St Jeor equation, accurate within +/- 200 calories for about 85% of healthy adults. Real metabolic rates vary by 5-15% between individuals, so use the result as a starting point and adjust after 2-3 weeks of tracking.

Should I use these tools instead of seeing a doctor? v

No. These are educational tools, not medical advice. If you have a medical condition, are pregnant, or under 18, consult a healthcare provider before making significant changes to your diet or exercise routine.

Which health metrics can I calculate here? v

Currently: daily calorie target (TDEE and BMR), macronutrient breakdown (protein, fat, carbs in grams), water intake, BMI, and a personalized 7-day regional meal plan. More health tools are on the way.

Is my health data saved anywhere? v

No. All calculations run locally in your browser. Your weight, height, age, and other metrics never leave your device and are never sent to a server.

Can I use this on mobile? v

Yes. OmniTools is designed mobile-first. All tools, including the calorie calculator with its multi-step form, work on phones and tablets.

How often should I recalculate? v

Recalculate every 4-6 weeks, or whenever your weight changes by more than 2-3 kg. Your calorie target changes as your body changes.

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