Health & Fitness

Use free health calculators for blood type compatibility, TDEE, caffeine clearance, wellness, nutrition, exercise planning, and body metrics.

4 Calculators

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Blood Type Compatibility Chart

Free blood type compatibility chart for all 8 ABO/Rh types. Instantly see who you can donate to, receive from, universal donor O-, and AB+ universal recipient.

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Body Location Finder

Click an interactive 3D body map to find body part names. Rotate, zoom, explore bones, and copy a location description. Free, with local-only markers.

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Caffeine Clearance Calculator

Estimate how long caffeine stays in your system with a caffeine half-life calculator, intake tracker, clearance time, and sleep impact chart.

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TDEE Calculator

Calculate your Total Daily Energy Expenditure (TDEE) using Mifflin-St Jeor or Katch-McArdle. Get calorie targets for maintenance, cutting, and bulking.