Free Health Calculators

BMI, calories, macros, heart rate, and clinical tools built on peer-reviewed formulas. No sign-up. No data stored. Just answers.

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Everything you need to track your health

Four focused categories covering body metrics, nutrition, fitness, and clinical tools.

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How it works

1Pick a calculator from 0 tools
2Enter your age, weight, height, and activity level
3Get instant results - all client-side, no data stored
Why Trust Calceva

Built on peer-reviewed formulas, not guesswork

Every formula traces back to a published study. Every calculation runs locally in your browser.

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Peer-Reviewed Formulas

Mifflin-St Jeor, Harris-Benedict, Katch-McArdle, and other validated equations cited with source papers.

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Client-Side Privacy

All calculations run in your browser via JavaScript. No health data is transmitted, stored, or tracked on any server.

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Always Free

No subscriptions, no paywalls, no premium tiers. Every calculator on Calceva is free to use, always.

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WHO, NIH & CDC Data

Reference ranges, BMI classifications, and clinical thresholds sourced from WHO guidelines, NIH publications, and CDC datasets.

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About Calceva

Calceva is an independent health tools platform built with one goal: give everyone access to accurate, free, and transparent health calculators. Every formula references peer-reviewed studies, WHO guidelines, and NIH publications so you can trust the numbers.

Maren Solvik - Health & Nutrition Writer, NASM-CPT

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FAQ

Common questions

All formulas come from peer-reviewed research papers and established medical equations. BMI classifications follow WHO standards. Calorie and macro calculations use the Mifflin-St Jeor equation (1990) and Katch-McArdle formula. Clinical reference ranges are sourced from NIH and CDC publications. Maren Solvik, our Health & Nutrition Writer, cross-references every formula before it goes live.
Yes. Every Calceva calculator runs entirely through client-side JavaScript in your browser. No weight, height, calorie, or health data is sent to any server. There are no accounts, no cookies tracking your inputs, and no data storage on our end. Your numbers stay on your device.
Every calculator on Calceva is 100% free with no hidden paywalls, premium tiers, or required sign-ups. The site is supported by display advertising. You get full access to all 0 tools without creating an account or providing an email address.
No. Calceva calculators provide estimates for informational and educational purposes only. They use standard formulas based on population averages and do not account for individual health conditions, medications, or body composition differences. For medical decisions, diagnosis, or treatment plans, always consult a licensed healthcare provider. These tools help you understand your numbers, not replace professional medical advice.
Each calculator uses the same validated formulas that healthcare professionals and researchers use. However, all formulas produce estimates based on population averages. Individual results can vary based on genetics, metabolism, medical conditions, and other factors. We cite the source formula on every calculator page so you can verify the methodology yourself.

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