27 calculator

Health

Calculates Body Mass Index from your height and weight and tells you the WHO category — underweight, normal,…

Computes your Basal Metabolic Rate — the calories you burn at rest just to keep the body running. The foundation of…

Estimates daily calorie needs based on sex, age, weight, height and activity level. Shows targets for maintenance,…

Total Daily Energy Expenditure — how many calories you burn in 24 hours given your lifestyle. The starting line for…

Splits your daily calories into grams of protein, carbs and fat by chosen ratio. Perfect for keto, IIFYM, fitness…

Body fat percentage using the US Navy method (waist, neck, hip measurements). More accurate than BMI for active…

Recommended daily water intake based on weight and activity level. Helps you stay hydrated, especially in summer or…

Maximum heart rate and training zones (cardio, fat-burn, endurance) by age. The basis for effective cardio and HIIT.

Calculates due date from the first day of last menstrual period and average cycle length. Also shows current…

Local context: Singapore parameters

Singapore's rules are unusually flat and predictable, and Health reflects that structure directly.

Currency: Singapore dollars, S$1,234.56. GST is currently 9% and shown inclusive on most consumer prices.
Income tax: Progressive resident rates from 0% up to 24%, with no capital gains tax and no inheritance tax.
CPF: Mandatory CPF contributions from both employer and employee, split across Ordinary, Special and MediSave accounts by age band.
Units: Metric — km, kg, °C, litres — with residential space quoted in square feet despite the metric norm.
Power: 230 V / 50 Hz with Type G plugs, and installations follow SS 638.

Example — CBD: An employee in the CBD uses Health to separate CPF from take-home pay before budgeting.
Example — HDB resale: A buyer checks an HDB resale figure with Health, keeping stamp duty as a separate calculation.

Every figure above applies to Singapore specifically and is reviewed when the rules change.