Sports Tools Hub

Sports Tools Hub is a collection of free calculators for training, nutrition, and performance. The pitch is that the math behind training (VO2 max, one-rep max, pace zones, calorie burn) is not complicated, but it is annoying to do by hand, and most existing calculators are buried under ads.

What the calculators cover

Common fitness metrics: pace and splits, heart-rate zones, one-rep max estimates, calorie burn by activity, body composition. The formulas are standard ones from exercise science; the site lists which formula each calculator uses.

Notes

• Free, no account required.
• Mobile-friendly, which matters because most of these calculations happen at the gym or on the track.
• The site is run as a utility. There is no training program, no coaching, no upsell to a paid plan.