Health & Fitness Calculators
Evidence-based formulas used by clinicians and coaches, explained in plain language. Results are estimates — not medical advice.
- 8 tested calculators
- Formulas explained
- Private and free
BMI Calculator
Body mass index with healthy weight range.
Calorie Calculator
Daily calories to maintain, lose or gain weight.
BMR Calculator
Calories burned at complete rest.
Body Fat Calculator
Body fat % from tape measurements.
Ideal Weight Calculator
Ideal body weight by four clinical formulas.
Macro Calculator
Daily protein, carbs and fat in grams.
Due Date Calculator
Estimated due date and current week of pregnancy.
Pace Calculator
Running pace, finish time or distance.
Know your numbers
Body mass index, calorie needs and body fat are simple numbers that help you set realistic goals and track progress. Each calculator explains the formula it uses — such as Mifflin-St Jeor for metabolism and the U.S. Navy method for body fat — along with its limitations, so you know how much weight to give the result.
These tools are for general information for healthy adults and are not a substitute for professional medical advice. Talk to your doctor before making significant changes to your diet or exercise.