# What is the inside diameter of 1 1 2 pipe?

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For example, a

**1**-**1**/**2**″**pipe**size actually has an outside**diameter**of 1.9″ NOT 1.5″.

Correspondingly, what is the OD of 1 1/2 inch pipe?

SCH 40 Bare & Black Standard Steel Pipe

Item # | Size | Outside Diameter |
---|---|---|

SCH 40 Pipe-3/4 | 3/4 in | 1.050 in |

SCH 40 Pipe-1 | 1 in | 1.315 in |

SCH 40 Pipe-1 1/4 | 1 1/4 in | 1.660 in |

SCH 40 Pipe-1 1/2 | 1 1/2 in | 1.900 in |

PVC and CPVC Pipes - Schedule 40 | ||
---|---|---|

Nominal Pipe Size (inches) | Outside Diameter (inches) | Minimum Wall Thickness (inches) |

3 | 3.500 | 0.216 |

4 | 4.500 | 0.237 |

5 | 5.563 | 0.258 |

Beside above, what is the inside diameter of 1 1/2 PVC pipe?

The **OD** for **1/2**" **PVC pipe** is 0.840" and the **OD** for 3" **PVC pipe** is 3.500". If the nominal size is the **ID**, then that means **1/2**" **PVC pipe** walls are . 170" thick and 3" **PVC pipe** walls are 0.250" thick. The wall thickness continues increasing as the **pipe** gets larger.

Subtract the doubled thickness from the total **diameter** to calculate the **internal diameter**. Doing so removes the object walls from your measurement, leaving only the space between them. In our 40-inch **pipe** example, the 40-inch **diameter** includes 4 inches of **pipe** wall that needs to be removed.