Health and Fitness
What Is Waist-to-Hip Ratio and What Is a Healthy Number?
Learn how to measure your waist and hips, how to work out the ratio, the WHO risk limits for men and women and what to do with the result.
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Health and Fitness
Simple calculators can give a useful starting point for everyday health habits: body mass index, daily calories, water intake and sleep timing. These guides explain what each number means, where it is useful and where it is not, so that you use the result as a guide and not as a diagnosis. They are general information and not medical advice.
11 guides
Health and Fitness
How to Test Your Reaction Time and Improve It
Measure your reaction time in milliseconds, learn what a typical score is, what affects it and how sleep, practice and setup can improve it.
Health and Fitness
How to Calculate Running Pace and Predict Race Times
Turn a distance and time into pace per kilometre and mile, speed, and projected finish times for 5K, 10K, half marathon and marathon.
Health and Fitness
How Many Calories Does Exercise Burn? Walking to Running
Estimate calories burned for 14 activities using MET values, with worked examples for a 70 kg person and honest limits of the estimate.
Health and Fitness
How to Find Your Target Heart Rate Zones for Exercise
Learn how to work out your maximum heart rate and training zones, with a simple method and a more personal one using resting heart rate.
Health and Fitness
How Much Protein Do You Need Per Day? A Simple Guide
Find your daily protein target based on body weight and activity, with examples for everyday life, strength training and weight loss.
Health and Fitness
How to Estimate Body Fat with the US Navy Method
Learn how the US Navy method estimates body fat from height, neck and waist, how to measure correctly, and how to read the result.
Health and Fitness
How to Use a Sleep Calculator: Bedtime and Wake-up Time
Find the best bedtime or wake-up time using 90-minute sleep cycles, and learn habits that improve the quality of your sleep.
Health and Fitness
How to Calculate BMI and Read the Result Sensibly
Calculate your body mass index in metric or imperial units, see the healthy weight range for your height and learn what BMI can and cannot tell you.