Fitness
8 tools
Calculators for training and everyday fitness, all running in your browser. Estimate your BMI and body-fat percentage, work out daily calorie needs, find your heart-rate training zones, project a one-rep max from a lighter set, plan a running pace, and check your water intake. These give solid estimates from well-known formulas — useful for planning, not a replacement for a coach or clinician.
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Frequently asked questions
Is BMI reliable if I am muscular?
Not on its own. BMI is only weight over height squared, so it cannot tell muscle from fat — a lean, heavily trained person can read as "overweight" while carrying little fat. It works as a rough population screen, not a verdict on an individual. Pair it with the body-fat estimate for a fuller picture.
How can I estimate my one-rep max without actually lifting it?
The one-rep max calculator uses a formula that projects your maximum from a weight you can lift for several reps — for example, 100 kg for 5 reps predicts roughly a 113 kg single. It is an estimate, most accurate in the 2 to 10 rep range and less so at very high reps, and it lets you gauge your max without the injury risk of a true one-rep attempt.
Do these replace advice from a coach or doctor?
No. They apply standard formulas to the numbers you enter and return an estimate, which is great for setting targets and tracking progress. They do not know your medical history, injuries or training context, so treat the output as a starting point and consult a professional before big changes.