Health calculators (16)

Body metrics and nutrition: BMI, BMR, TDEE, body fat, ideal weight, macros, hydration, heart-rate zones, due date.

Markdown version: /health.md · JSON: /api/v1/calculators?category=health

• BMI Calculator — Computes body mass index (BMI) from weight and height and classifies it with the WHO adult categories, plus the healthy weight range for that height. (md · api)
• BMR Calculator — Estimates basal metabolic rate (calories burned at complete rest per day) with the Mifflin-St Jeor equation, and also reports the revised Harris-Benedict estimate. (md · api)
• TDEE Calculator — Estimates total daily energy expenditure from Mifflin-St Jeor BMR and an activity level, and derives calorie targets for maintaining, losing or gaining weight. (md · api)
• Body Fat Calculator — Estimates body-fat percentage from height and neck, waist (and hip for women) circumferences using the US Navy method, and classifies the result with ACE categories. (md · api)
• Ideal Weight Calculator — Computes ideal body weight from height and sex with the four common clinical formulas (Devine, Robinson, Miller, Hamwi) and the BMI 18.5–24.9 healthy range. (md · api)
• Water Intake Calculator — Estimates daily drinking-water needs from body weight (35 ml per kg) plus an allowance for exercise time, reported in litres, millilitres and 240 ml cups. (md · api)
• Calorie Deficit & Weight Loss Time Calculator — Converts a weight change goal into total energy and the number of days and weeks required at a given daily calorie deficit or surplus, using 7,700 kcal per kilogram of body fat. (md · api)
• Macro Calculator — Splits a daily calorie target into grams of protein, carbohydrate and fat using a preset ratio (balanced, low-carb, high-protein, keto) or custom percentages. (md · api)
• Heart Rate Zone Calculator — Estimates maximum heart rate from age (Tanaka or Fox formula) and computes the five training zones, using the Karvonen heart-rate-reserve method when resting heart rate is supplied. (md · api)
• Pregnancy Due Date Calculator — Estimates the due date, conception date and current gestational age from the first day of the last menstrual period, adjusting for cycle length (Naegele's rule). (md · api)
• Ovulation Calculator — Estimates the ovulation date, the six-day fertile window and the next period start from the first day of the last period and the average cycle length. (md · api)
• Waist-to-Height Ratio Calculator — Divides waist circumference by height and classifies the ratio using the 'keep your waist to less than half your height' guidance (NICE 2022). (md · api)
• Lean Body Mass Calculator — Estimates lean body mass (fat-free mass) from weight, height and sex with the Boer (1984), James (1976) and Hume (1966) formulas. (md · api)
• Protein Intake Calculator — Recommends a daily protein range in grams from body weight and goal (sedentary RDA 0.8 g/kg up to 1.6–2.2 g/kg for muscle gain or fat loss), based on the ISSN position stand. (md · api)
• Blood Pressure Category Calculator — Classifies a systolic/diastolic blood pressure reading into the ACC/AHA 2017 categories (normal, elevated, stage 1, stage 2, hypertensive crisis) and reports mean arterial and pulse pressure. (md · api)
• Body Surface Area Calculator — Computes body surface area in square metres from height and weight using the Mosteller and Du Bois formulas, as used for chemotherapy and other weight-independent dosing. (md · api)