If you are unable to use our Body Fat Calculator, or if you are interested in how your Body Fat Percentage is calculated, this page has the mathematical **Body Fat Formula**.

The best time to use this formula, is in the morning. Your body weight and waist measurements are the most accurate just after you wake up from 7-8 hours of sleep.

The formula below will not calculate your exact body fat percentage. The most accurate way is underwater weighing, but this formula should give you a consistent measurement you can use as a guideline so you can determine if you're losing body fat and/or muscle.

Body Fat Formula For Women | |
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Factor 1 | (Total body weight x 0.732) + 8.987 |

Factor 2 | Wrist measurement (at fullest point) / 3.140 |

Factor 3 | Waist measurement (at naval) x 0.157 |

Factor 4 | Hip measurement (at fullest point) x 0.249 |

Factor 5 | Forearm measurement (at fullest point) x 0.434 |

Lean Body Mass | Factor 1 + Factor 2 - Factor 3 - Factor 4 + Factor 5 |

Body Fat Weight | Total bodyweight - Lean Body Mass |

Body Fat Percentage | (Body Fat Weight x 100) / total bodyweight |

Body Fat Formula For Men | |

Factor 1 | (Total body weight x 1.082) + 94.42 |

Factor 2 | Waist measurement x 4.15 |

Lean Body Mass | Factor 1 - Factor 2 |

Body Fat Weight | Total bodyweight - Lean Body Mass |

Body Fat Percentage | (Body Fat Weight x 100) / total bodyweight |