BMI Calculator WHO method
Body Mass Index = weight / height². Categories follow WHO cutoffs.
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Global Settings
Switching updates field labels live.
Tip: Fill once — every calculator can reuse these. You can still override inside any card.
Smart Overview & Advice
Enter details or run any calculator to see a smart summary with suggestions.
BMR & TDEE Mifflin‑St Jeor
Basal Metabolic Rate and daily calorie needs based on activity level.
Body Fat % US Navy
Uses neck/waist (+ hip for women) and height. Works with cm or inches based on Global Settings.
Relative Fat Mass (RFM)
Alternative to BMI using waist and height (Woolcott & Bergman).
Ideal Body Weight Devine
Estimates ideal body weight using the Devine formula (height over 152.4 cm / 5 ft).
Daily Water Intake
Rule of thumb: ~35 ml per kg body weight + extra for exercise & hot climates.
Waist‑to‑Height Ratio
Screening for central adiposity: keep waist < 0.5 × height ideally.
Waist:Hip Ratio
Risk threshold: men ≥0.90, women ≥0.85 may indicate higher risk.
Target Heart Rate Zones
Estimated zones from 50% to 95% intensity using 220 − age (or HRR Karvonen with RHR).
If provided, Karvonen (HRR) method is shown alongside.
Blood Pressure Category ACC/AHA
Enter an average home or clinic reading.
HbA1c ↔ Average Glucose
eAG (mg/dL) ≈ 28.7 × A1c − 46.7 · mmol/L = mg/dL ÷ 18.
eGFR (CKD‑EPI 2021, creatinine)
Estimates kidney filtration. Uses the race‑free 2021 equation.
Lipids: LDL, Non‑HDL & Ratios Friedewald
Approximate LDL (fasting): LDL = Total − HDL − Triglycerides/5.
Macro Planner
Split your calories into protein, fat, and carbs.
Protein & Fiber Targets
Quick targets from weight & calories.
Calorie Burn (MET)
Energy cost = MET × weight(kg) × hours.
Pregnancy Dates Naegle’s rule
Get EDD, current gestational age & trimester (if LMP known).
Calorie Deficit Planner
Plan weekly weight change with a daily calorie target (approximate).
Weight Goal Timeline
How long to reach a target weight at a chosen weekly rate.
Use positive numbers; direction inferred from goal.
Body Surface Area Mosteller
BSA (m²) = √((height(cm) × weight(kg)) / 3600).
Sleep Schedule & Needs
Suggests bedtimes using ~90‑min sleep cycles and adult target 7–9 hours.
VO₂max (Cooper 12‑min)
Estimate from distance in 12 minutes: VO₂max = (meters − 504.9) / 44.73.
About these calculators & important notes
- Estimates for education only; not a diagnosis or treatment plan. Always consult a healthcare professional for medical decisions.
- BMR uses Mifflin‑St Jeor. Body fat uses US Navy method. LDL uses Friedewald (unreliable if TG ≥ 400 mg/dL or non‑fasting). eGFR uses CKD‑EPI 2021 (creatinine‑only).
- All computations run locally in your browser. No data is transmitted.
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