Work out what you need · then check if it was right

The number you get is a starting guess.

Every calculator hands you a calorie total as if it were fact. This one asks what you actually eat and drink first, shows you how wide the guess could be, and walks you through the two-week check that tells you whether it was close.

  1. Safety
  2. Body
  3. Activity
  4. Goal
  5. Habits
  6. Plan
Before we start

Is this tool safe for you to use?

A few situations change what your body needs enough that a general formula gives the wrong answer — sometimes a dangerous one. Tick anything that's true. Nothing here is stored or sent anywhere.