Frequently Asked Questions
Is Body Tracker free to use?▾
Yes. Body Tracker is completely free. Guests get browser-based storage with no account required. Sign in to sync your data across devices.
How is body fat percentage calculated?▾
If you enter body fat % directly from a smart scale, that value is used. Otherwise, the US Navy method estimates it from waist, neck, and hip measurements.
What is BMR?▾
BMR (Basal Metabolic Rate) is the number of calories your body burns at rest. It's calculated using the Mifflin-St Jeor formula from your weight, height, age, and sex.
What is TDEE?▾
TDEE (Total Daily Energy Expenditure) is your BMR multiplied by an activity factor. It estimates the total calories you burn per day including exercise and movement.
Is my data private?▾
Guest data is stored only in your browser and never sent to our servers. Signed-in data is stored securely in your personal account and is never shared.
What units are supported?▾
Both metric (kg, cm) and imperial (lbs, inches) are supported. You can switch units at any time — data is always stored in metric internally.
What is the Navy method for body fat?▾
The US Navy method estimates body fat % from circumference measurements (waist, neck, and hips for women) and height. It requires no special equipment.
How do I track progress over time?▾
Log entries on different dates and trend charts will appear automatically once you have two or more data points for any metric.