Estimate blood alcohol level using Widmark formula — includes time to sober up.
Calculate your body mass index and find the normal weight range.
Calculate how many calories you burn per day at rest.
Calculate your personal daily calorie requirement.
Calculate how much sleep you need based on your activity level.
Calculate your running pace based on distance and time.
Calculate your daily water requirement based on weight and activity level.
Calculate daily calorie needs and macronutrients based on your goals.
Calculate optimal bedtime or wake-up time based on 90-minute sleep cycles.
Calculate due date, pregnancy week, and trimester.
Calculate your optimal heart rate zones using the Karvonen formula.
Calculate calories burned during exercise based on MET values.
Calculate wind chill temperature and how cold it feels in windy weather.
Estimate body fat percentage using the US Navy formula from simple measurements.
Calculate daily protein needs based on body weight and activity level.
Calculate ideal body weight using Devine, Robinson, and Miller formulas.
Calculate your pregnancy due date, current week, and trimester using Naegele's rule.
Check your blood pressure category based on AHA guidelines.
Estimate your 1RM for any lift using the Epley and Brzycki formulas.
Calculate your waist-to-hip ratio and health risk category per WHO guidelines.
Find your fertile window and estimated ovulation day based on cycle length.
Calculate the daily calorie deficit needed to reach your weight-loss goal.
Convert daily step count to calories burned using the MET method.
Calculate calories in beer, wine, spirits, and cocktails per serving.
Calculate net carbs by subtracting fiber and sugar alcohols for keto diets.
Convert your dog's age to human years based on breed size.
Convert your cat's age to human years using veterinary guidelines.
Predict possible blood types for a child based on parents' blood types.
Convert running pace between min/mile and min/km with race time estimates.
Calculate how much water you should drink daily based on weight and activity.