Estimate your body fat percentage with the U.S. Navy method from body measurements, then see your fat mass and lean body mass.
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Estimate lean body mass with Boer, James and Hume, with an optional comparison from a known body-fat percentage.
Health & wellnessNewUse this tool
Calculate FFMI, height-normalized FFMI and FMI from height, weight and body-fat percentage.
Health & wellnessNewUse this tool
Calculate your running pace, finish time or distance, predict race times from 5K to marathon and get your split times, in miles or kilometres.
Health & wellnessNewUse this tool
Estimate your basal metabolic rate in kcal and kJ, and compare the Mifflin-St Jeor, Harris-Benedict and Katch-McArdle equations.
Health & wellnessNewFeaturedUse this tool
Work out your bra size from your underbust and bust measurements, with UK, US, EU, French, Italian and Australian sizes and sister sizes.
Health & wellnessNewFeaturedUse this tool
Validate JSON-LD syntax and detect types, entities, and structural warnings.
Web & SEONewFeaturedUse this tool
Encrypt and decrypt text with a password using AES-256-GCM, right in your browser.
Security & privacyNewFeaturedUse this tool
Generate TOTP 2FA codes from a Base32 secret, build the otpauth:// URI and verify a 6- or 8-digit code.
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Calculate your maximum heart rate (Tanaka, 220 − age, Gulati) and your five training zones, with the Karvonen method if you know your resting heart rate.
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Calculate your body mass index from height and weight, with adult reference ranges and clearly explained limitations.
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Estimate your total daily energy expenditure from your activity, compare the five levels and get guideline intakes for each weight goal.
Health & wellnessNewFeaturedUse this tool
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Resources
Guides, methods and stories.
The latest guides, tutorials and profiles published on Bethemesh.
NewsConcepts and technologiesIntermediate
Is local browser processing replacing traditional online tools?
WebAssembly, browser APIs and faster devices enable more processing locally. How far can this approach replace services that upload files to servers?
30 August 20264 min
GuideBest practicesBeginner
Body composition: understanding what your weight doesn't tell you
Understand the difference between weight, fat mass, lean mass and muscle mass, and why the scale tells only part of the story.
30 September 20264 min
GuideBest practicesBeginner
Body fat: what is body-fat percentage and how should you interpret it?
Learn what body-fat percentage measures, how it differs from fat mass in kilograms and what to keep in mind when tracking changes over time.
30 September 20264 min