Stairs Calculator

This calculator is intented as a guide. Even though we have based the calculations on the IRC, you must always check with local building codes to ensure there are no variances.

For help, simply click on the(?) beside the section you need help with., Or watch this Tutorial Video.

Step1

Total Rise

Feet:
Inches:

Step2

Tread

1-2x10
1-2x12
2-2x6
2-2x8

Nosing (min ¾", max 1¼")

Inches:

Step3

Stringer Type

Outside Frame - Level with deck
Outside Frame - First rise below deck
Inside Frame - First rise below deck

Joist Measurements

2x6
2x8
2x10
2x12
Double Rim Joist?

Stringer Size

2x10
2x12
Be sure to recalculate any changes before printing.

*All results given in inches

**After stringer is measured, cut thickness of one tread from bottom

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