WHO · CDC · NHS · AHA aligned
Your health,
calculated.
Ten free clinical calculators built on published WHO, CDC, NHS, and AHA formulas.
No signup · No data stored · Cited sources
All tools
See methodology →BMI Calculator
Body Mass Index with WHO classification and personalized health interpretation.
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Calorie Calculator
Daily calorie needs for weight loss, maintenance, or muscle gain. TDEE-based, customizable.
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Pregnancy Due Date
Estimated due date, current week, and trimester from LMP, conception, or IVF transfer.
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Macro Calculator
Daily protein, carbs, and fat targets — balanced, high-protein, keto, or low-carb splits.
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BMR Calculator
Basal Metabolic Rate using the Mifflin-St Jeor equation. The starting point for any calorie plan.
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Blood Pressure Analyzer
Enter your BP readings and get ACC/AHA stage classification with actionable guidance.
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Body Fat Calculator
Estimate your body fat percentage using the US Navy method with ACE classification.
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Ideal Weight Calculator
Find your ideal body weight using Devine, Robinson, Miller, and Hamwi formulas.
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Water Intake Calculator
Calculate how much water you should drink daily based on your weight and activity level.
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GFR Calculator
Estimated Glomerular Filtration Rate using the CKD-EPI 2021 race-free equation.
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Methodology
Every formula, cited.
Each calculator names its equation and links to the original guideline document.
Editorial process
Honest about authorship.
An independent project — we say that plainly instead of inventing credentials.
Privacy
Your data stays here.
Calculator inputs never leave your browser. Optional progress tracking lives only on your device.