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.
InstantUse it →
Calorie Calculator
Daily calorie needs for weight loss, maintenance, or muscle gain. TDEE-based, customizable.
InstantUse it →
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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Guides & explainers
Browse all tools →Body composition
BMI vs body fat percentage
Which number actually reflects your health — and exactly when BMI misleads.
Kidney function
Normal eGFR by age
What a healthy kidney-function range looks like, and how it shifts as you age.
Kidney function
CKD stages G1–G5 explained
What your eGFR result means, stage by stage, in plain English.
Kidney function
CKD-EPI 2021 vs 2009
Why the eGFR formula changed — and how it affects your number.
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.