This deck joist span calculator will really help you as you plan how to build a deck.

It tells you how far joists at certain spacings apart from each other can span lengthwise between supporting beams.

Pick the species of lumber, size of joist and spacing and find out what will work best for your plan. Then transfer all the results over to our beam calculator to complete your planning.

Use the joist span data print out for your reference.

Although all data is based on engineering tables be sure to have a professional double check any plans you create before building.