Twelve free, instant calculators for weight, nutrition, fitness, and pregnancy — all run entirely in your browser.
Body mass index from your height and weight, with CDC weight categories.
CalculatorEstimate body-fat % with the U.S. Navy tape method from a few measurements.
CalculatorA healthy-weight range from the Devine, Robinson, Miller, and Hamwi formulas.
CalculatorBasal metabolic rate — the calories you burn at rest — via Mifflin-St Jeor.
Total daily calorie needs, plus targets for cutting and bulking.
CalculatorSplit your calories into protein, carbs, and fat by goal or custom ratio.
CalculatorA daily hydration target from your body weight and activity.
CalculatorEstimate calories burned for dozens of activities using MET values.
Max heart rate and target training zones, including Karvonen (heart-rate reserve).
CalculatorSolve for pace, speed, time, or distance for any run.
Estimate your due date from your last period, conception, or ultrasound.
CalculatorFind your fertile window, ovulation day, and next period from your cycle.
This tool is for general informational and educational purposes only and is not medical advice. It does not diagnose, treat, or replace care from a qualified professional. Always consult a physician or other qualified healthcare provider about your individual health.