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Deck Stairs Calculator

? How do I use this calculator?

Building stairs for your deck is often considered “the most difficult part of” the construction project. Having the right calculations before getting started can make the task a lot easier.

To simplify the process, we’ve created this deck stair calculator to help you determine the correct measurements needed to carry out your project. Once you’ve calculated the number of steps, you’ll then need to know how to build stairs for your deck.

This calculator will tell you:

  • How Many Rises You'll Need
  • Dimensions for each rise
  • Total run and rise
  • Step run (tread depth)
  • step rise (riser height)
  • bottom step rise
  • angle of your staircase
  • stringer length
  • How Many Rises You'll Need
  • Dimensions for each rise
  • Total run and rise
  • Step run (tread depth)
  • step rise (riser height)
  • bottom step rise
  • angle of your staircase
  • stringer length
? How do I use this calculator?
1

Total Rise

Height of your deck to the ground
ft
Totalrise
2

Step Run

Horizontal tread depth for each stair
Steprun
3

Tread Type

Single board or two smaller boards for stair tread
Select:
Twoboards54x6 Twoboards2x6 Oneboard2x12
4

Stringer Attachment

Outside frame or flush frame
Select:
Outsideframe Flushframe

Building stairs for your deck is often considered “the most difficult part of” the construction project. Having the right calculations before getting started can make the task a lot easier.

To simplify the process, we’ve created this deck stair calculator to help you determine the correct measurements needed to carry out your project.

? How do I use this calculator?

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PRO TIP: A shorter rise may be more comfortable to climb with a deeper run. Similarly, a taller rise might work better with a shorter run. Check your local building codes for allowable rise and run.

Balusters Needed:
1
Section Width
2
Center Point (space centered):
3
Outside Space
On Center Measurements (Left-to-right):