Every tool here uses peer-reviewed formulas and transparent methodology — body composition, nutrition, fitness, sleep, and women’s health. Free, instant, no account.
Measure where your weight comes from — fat, muscle, and how it’s distributed — with tools that go beyond the bathroom scale.
Find how many calories your body needs and how to split them — the foundation of any cut, bulk, or maintenance plan.
Train smarter with strength, pace, and heart-rate tools built on established sports-science formulas.
Time your sleep around natural cycles and understand how alcohol affects your body.
Track cycles, fertility windows, and pregnancy milestones. These tools give estimates only and are not a substitute for medical advice.
FitCalcTools also covers personal finance — loans, debt payoff, retirement, and investing.