A-frame House Calculator

A-frame House Geometry Calculator

Calculate height, rafter length, and the number of rafters for your A-frame house. Choose units and enter your dimensions below.

ft ft ft

How to Use the A-frame House Geometry Calculator

This calculator helps you quickly estimate the main dimensions for building an A-frame house. Enter your planned house width, length, roof angle, and the spacing you want between rafters. The calculator will show you:

  • Overall Height of the house (from slab to peak)

  • Rafter Length (for one side of the roof)

  • Number of Rafters needed along the length of the house

  • Rafter Spacing (as entered)

How it works:

  1. Choose your units: Imperial (feet) or Metric (meters).

  2. Enter your values: Type your desired house width, length, roof angle (in degrees), and rafter spacing.

  3. Click “Calculate”: Instantly see the main geometry results below.

  4. Copy any result: Click on a value to copy it for your plans or notes.

Note:
This calculator is for basic planning and geometry only. For structural safety, material strength, and building codes, always consult with a structural engineer before building!