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Health & Fitness Tools
901 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/carb/fat from goal
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
L/hr sweat + hydration plan
Aerobic capacity benchmark
WHtR — better than BMI
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.
Find your ideal weight range using 5 medical formulas — with ASEAN-adjusted healthy ranges.
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
Calculate your daily protein, carbs and fat targets — based on your body, goals and activity level.
Calculate your daily calorie needs based on age, weight, height and activity level.