Building Materials Online

Materials specifications

Floor Joist Calculator

Use this floor joist calculator to determine the number of floor joists you will need and how much they will cost. You can also use this calculator to determine the maximum allowable span a floor joist can be depending on its wood species, grade, size, and supported load.

This calculator runs on Omni Calculator. Opens omnicalculator.com in a new tab.

Open calculator

More in Materials specifications

Disclaimer: BMO (Building Materials Online) shall not be held responsible for any deviations or issues on costings and calculations that arise from usage of these tools. They should be used as working reference & guidelines and may not include all external factors affecting final results in your project.

Add BMO to your Home Screen

Opens full screen like an app, one tap away.

  1. Tap Share: at the bottom in Safari, at the top right in Chrome.
  2. Choose Add to Home Screen, then Add.

Open your browser's menu and choose Install app or Add to Home screen.