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Health & Fitness Tools
920 free calculators, converters and checkers — built for SG, MY and the region, reviewed with current figures. No accounts, no paywalls.
Widmark formula (educational only)
WHO weight, length/height & head-circumference percentiles for ages 0–60 months
Decay tracker + sleep cutoff
Likely conception date, fertile window + due date
FTP + W/kg + Coggan zones
Karvonen HRR 5-zone method
Boer + Hume + James formulas
Protein set by body weight (g/kg); carbs fill the rest
Tanaka/Fox/Gulati/Nes equations
MET-based, 35+ activities
Predict a child's adult height from the parents
5-formula 1RM average + % table
Your six-day fertile window, with the uncertainty stated instead of hidden behind a single date.
Riegel formula across distances
Mifflin-St Jeor + TDEE multipliers
Target time → pace + splits
Measured sweat rate in L/h from a before-and-after weigh-in
Aerobic capacity benchmark
WHtR — keep your waist under half your height
Calculate your BMI instantly using ASEAN health thresholds — metric and imperial.
Calculate your daily calorie needs in seconds — enter your details and get your maintenance calories instantly.
Calculate your ideal daily water intake based on weight, activity and climate — with ASEAN tropical heat adjustment.
Estimate your body fat percentage using the Navy method — with ASEAN-specific health ranges.
See what the Robinson, Miller, Devine and Hamwi formulas give for a height of 5 ft or more, side by side with the BMI 18.5–22.9 band.
Calculate your pregnancy due date and current week — enter your last period or conception date.
Find the best times to wake up or go to sleep based on 90-minute sleep cycles — wake up refreshed, not groggy.
Calculate target heart rate zones
Split your daily calories into protein, carbs and fat by percentage.
Calculate your daily calorie needs based on age, weight, height and activity level.