Fitness
tools
10 tools that show their working. Each one uses the numbers this site already publishes, so the answer here and the answer in the guide are the same answer. No account needed, and nothing you type is stored.
Read the maths behind theseEnergy and nutrition
What a day costs you, and how to divide it.
TDEE and calorie targets
What a day costs you, and the five calorie targets that come off it.
Signed in, the weight box opens in your unit and the activity level starts from the training days on your profile.
Macros
A calorie target divided into protein, fat and carbohydrate.
Nothing here is stored. Everything stays in this browser.
Strength
What you lifted, what it is worth, and what to hang on the bar.
Body composition
Measurements, and what they do and do not tell you.
BMI
One division, the category it falls in, and what it cannot tell you.
Nothing here is stored. Everything stays in this browser.
Body fat and lean mass
The tape measure estimate, and the lean mass that comes off it.
Saves the measurements and the estimate to your own line.
Cardio and pacing
Heart rate, pace and distance.
Heart rate zones
Five training zones, from your age and your resting heart rate.
Nothing here is stored. Everything stays in this browser.
Pace and race times
Your pace from any run, and what it predicts at other distances.
Nothing here is stored. Everything stays in this browser.
Calories burned
What a session cost, gross and net, and why those differ.
Nothing here is stored. Everything stays in this browser.
In the gym
For the session itself, rather than the arithmetic around it.
What is not here, and why
No measurement tracking. Every tool here works out an answer and forgets it, and nothing in the database stores a waist or a bodyweight over time, so a chart of your own trend is not something this site can honestly offer yet. That is the thing worth building next, because the tape measure estimate above is far more useful as a line than as a number.