The Average Mass Calculator is designed to help calculate the average mass when provided with four known mass values, or to find the missing mass when given an average mass and four known values. This tool is especially useful in fields like science and engineering, where accurate mass measurements are essential.

### How to Use This Calculator

**Enter Mass Values**: Fill in any four of the five mass values (M1, M2, M3, M4, M5) in kilograms.
**Enter Average Mass**: If known, you can also input the average mass value to find the missing mass.
**Calculate**: Click the **Calculate** button to compute either the average mass or the missing mass value, depending on your input.

**Input Field Details**

**Field** |
**Description** |

**M1 (kg)** |
Enter the first mass value (M1) in kilograms. |

**M2 (kg)** |
Enter the second mass value (M2) in kilograms. |

**M3 (kg)** |
Enter the third mass value (M3) in kilograms. |

**M4 (kg)** |
Enter the fourth mass value (M4) in kilograms. |

**M5 (kg)** |
Enter the fifth mass value (M5) in kilograms if available, or leave it blank. |

**Average Mass (kg)** |
If known, enter the overall average mass in kilograms. This can be used to determine a missing mass value if only four masses are given. |

### How Calculator calculate Your Values

Example 1: Finding the Average Mass

**Input Field** |
**Value** |

**M1** |
5.0 kg |

**M2** |
6.0 kg |

**M3** |
5.5 kg |

**M4** |
6.5 kg |

**Average Mass** |
Calculated as 5.75 kg |

In this example, entering four known values (M1 to M4) allows the calculator to find the average mass, which is 5.75 kg.

Example 2: Finding a Missing Mass Value

**Input Field** |
**Value** |

**M1** |
4.5 kg |

**M2** |
5.5 kg |

**M3** |
6.0 kg |

**M4** |
5.0 kg |

**Average Mass** |
5.6 kg |

**M5** |
Calculated as 6.4 kg |

Here, knowing the average mass (5.6 kg) and four values (M1 to M4), the calculator computes the missing mass (M5) as 6.4 kg.

This calculator provides a straightforward way to manage and compute mass-related data efficiently, ensuring accurate calculations based on the relationship between individual masses and their average.