Health calculators
Good estimates, clearly labelled. Your doctor still gets the last word.
BMI, calories, body fat, macros, fitness, sleep, pregnancy due dates and cycle dates.
Body and weight
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BMI Calculator
Calculate body mass index in metric or imperial units. e.g. Your BMI = 22.9 -
Body Fat Calculator
Estimate your body fat percentage from a few tape-measure readings. e.g. Body fat = 16.4% -
Ideal Weight Calculator
Your ideal weight by four medical formulas, and the healthy BMI range for your height. e.g. Devine (the most used) = 73.2 kg -
Waist-to-Hip Ratio Calculator
Your waist-to-hip and waist-to-height ratios, and what they say about health risk. e.g. Waist-to-hip ratio = 0.8 -
BMR and Calorie Calculator
Estimate the calories your body burns at rest and in a normal day. e.g. BMR (at complete rest) = 1,345 kcal/day -
Child Height Predictor
How tall your child is likely to be as an adult, from the parents’ heights. e.g. Likely adult height = 179 cm
Food, drink and nutrition
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Calorie Deficit Calculator
How many calories a day to eat to lose weight, and how long it takes. e.g. Eat per day = 1,368 kcal -
Macro Calculator
Grams of protein, carbs and fat a day for your calories and eating style. e.g. Protein per day = 100 g -
Protein Calculator
How much protein you need a day, for your weight and your goal. e.g. Protein per day = 98 g -
Water Intake Calculator
A rough daily water estimate based on your weight and exercise. e.g. Estimated water per day = 2.5 L -
Goal Weight Date Calculator
When you will reach your goal weight at a steady weekly pace, and the deficit it takes.
Coffee, alcohol and smoking
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Blood Alcohol (BAC) Calculator
A rough estimate of your blood alcohol level, and how long it takes to fall to zero. e.g. Estimated BAC = 0.047% -
Caffeine Calculator
How much caffeine is still in your body at bedtime, hour by hour. e.g. Caffeine left at bedtime = 25 mg -
Quit Smoking Savings Calculator
The money and cigarettes you have saved since you quit, and what a year saves. e.g. Money saved = 547.50
Fitness and sleep
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Calories Burned Calculator
How many calories an activity burns, for your weight and how long you do it. e.g. Calories burned = 343 kcal -
Running Pace Calculator
Find your pace, finish time or distance, in km or miles. e.g. Pace per km = 5:30 /km -
Heart Rate Zone Calculator
Your maximum heart rate and the five training zones, from your age. e.g. Maximum heart rate = 180 bpm -
Steps to Miles and Km Calculator
How far your steps take you in km or miles, or how many steps a distance is. e.g. Distance = 7.04 km -
One-Rep Max Calculator (1RM)
Your estimated one-rep max from any set, and the weights for every rep range. e.g. Estimated one-rep max = 116.7 kg -
Sleep Calculator: Bedtime and Wake-Up Time
When to go to bed, or when to wake up, to fit whole 90-minute sleep cycles. e.g. Go to bed at, for 6 cycles (9 hours of sleep) = 21:45 -
Race Time Predictor
Your likely time for a 5K, 10K, half or full marathon, from a recent race. e.g. Predicted time = 1:50:19
Pregnancy and cycle
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Pregnancy Due Date Calculator
Estimate a due date from the last period or the conception date. -
Ovulation Calculator
Your likely ovulation day and fertile window, for this cycle and the next ones. -
Period Calculator
When your next periods are due, for the next six cycles. -
Conception Date Calculator
When conception most likely happened, from a due date, last period or birth date.
