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Accurate, evidence-based calculators for fitness, nutrition, pregnancy, and everyday health — 100% free, private, and easy to use.

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BMITDEEBody FatPregnancy Due DateProtein Intake
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B

BMI

Find your Body Mass Index and see what it means for your health — using the WHO formula, with India-specific cutoffs applied automatically based on your region.
T

TDEE

Estimate your Total Daily Energy Expenditure — the calories you burn per day — using the Mifflin-St Jeor equation, then see targets for losing, maintaining, or gaining weight.
B

Body Fat

Estimate your body fat percentage from a few tape measurements using the U.
P

Pregnancy Due Date

Estimate your due date from the first day of your last menstrual period using Naegele's Rule (LMP + 280 days).
P

Protein Intake

Find your recommended daily protein range based on your body weight and activity level, from the RDA baseline up to athlete-level intake.

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F

Fitness & Body

Build, measure & improve
N

Nutrition

Food, calories & nutrients
P

Pregnancy

For you and your baby
G

General Health

Everyday essentials

Why HealthCalcNow

Built on trust, not guesswork

Evidence-Based

Sources: WHO, CDC, NIH

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Guides

Featured health guides

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H

How to Calculate Your TDEE

Understand your daily calorie needs in simple steps.
P

Protein Intake: How Much Do You Need?

Science-backed recommendations for your goals.
P

Pregnancy Due Date Guide

How due dates are calculated and what to expect.

Questions

Frequently asked questions

Every calculator is built on a published, cited formula. Each result shows its source and a confidence level, so you know how precise the estimate actually is.
No. Every calculation runs on your device — nothing is sent to a server, and no account is required.
No — these tools are for informational purposes only and aren't a substitute for professional medical advice.

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